What's In My Jar
Peter Thomas Roth Potent-C Moisturizer
Peter Thomas Roth

Peter Thomas Roth Potent-C Moisturizer

Efficacy100/100IrritancyMedium
See all ingredients In 16 routines
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Works for

3 of 3 advertised claims delivered

Anti-aging
7 ingredients credited for this claim
Strong support
What the product description says
“Anti-aging, firming and brightening moisturizer that combines THD Ascorbate mega-potent Vitamin C with Hydrolyzed Collagen and Trimoist KMF to plump the look of skin with 24-hour hydration.”
Source: Lookfantastic US

This product can help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness because it contains tetrahexyldecyl ascorbate.

These ingredients in the product can also be helpful, even though there is less evidence for their effectiveness: carnosine, ferulic acid.

Keep in mind that it typically takes at least 6 weeks to notice any results because the changes that are needed to improve fine lines and elasticity happen in the deeper layers of the skin. No topical anti-aging product can “erase” wrinkles or fully reverse signs of aging.

Tetrahexyldecyl ascorbateKey activeEffect: HighBeing a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.~4.2–5.1%
CarnosineKey activeEffect: MediumA type of peptide. It attracts water to the upper layer of the skin. It can help neutralize free radicals in skin combatting the sun damage~0.3–0.6%
Ferulic acidKey activeEffect: MediumA potent anti-oxidant that has been shown to be effective in neutralizing free radicals in skin. There seem to have a synergetic effect of ferulic acid, vitamin E and C, meaning that when the ingredients are used together, they enhance each other's ability protect the skin against free radicals. Ferulic acid also helps to stabilize other ingredients - including vitamins C and E. It can help to even out the skin tone. Ferulic acid is approved for use as a sunscreen ingredient in Japan in concentrations up to 10%~1.2–1.4%
GluconolactoneUnder-dosedEffect: HighA polyhydroxy acid (PHA) that helps shed the dead cells from the skin surface revealing smoother skin. Is believed to be genter than AHAs. It helps attract water to the upper layer of the skin and can stimulate production of skin's own hyaluronic acid resulting in improved hydration levels. It has been shown to be helpful against acne and clogged pores if used consistently (e.g over a period of 12 weeks) in high enough concentration. It can help reduce fine lines and wrinkles and improve skin tone with long-term application. Can help neutralize free radicals~0.5–0.75%
Lactic acidUnder-dosedEffect: MediumAn exfoliating and moisturizing alpha-hydroxy acid (AHA). Typically causes less irritation than other AHAs, for example, glycolic acid. At high concentrations (about 15%), lactic acid can help reduce lines and wrinkles. Recent studies show that lactic acid can support the "good" bacteria living on skin's surface (healthy skin microbiome)~0.3–0.55%
TocopherolEffect: Low, below effective dosePure form of vitamin E. Can help moisturise and protect the skin from free radicals. Often used to help stabilise other ingredients or the formula itself~0.55–0.8%
Butyrospermum parkii butterEffect: Low, below effective doseA great moisturising ingredient that softens the skin and reduces water loss from its upper layer. It also can be helpful in protecting skin from free radicals~0.55–0.85%
Moisturizing
27 ingredients credited for this claim
Strong support
What the product description says
“Potent-C Moisturizer”
From product name

This product can help improve hydration of the skin with the two types of ingredients.

The first type is called “humectants”:
these ingredients help attract water. When humectants are on the surface of the skin, they “pull in” the moisture from the outside environment, or from within deeper layers of the skin. The following ingredients in this product do the job: carnosine, glycerin.

This product also contains ingredients called “occlusives”. They help reduce the speed with which our skin loses moisture to the outside environment. These ingredients also help soften the upper layer of the skin, so it feels less tight and nicer to the touch. The following ingredients in this product do the job: glycine soja sterols, hydrolyzed collagen.

The following ingredients in this product are especially good for supporting the skin barrier and helping with the hydration level: ceramide np

GlycerinKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant~2.2–2.7%
Glycine soja sterolsKey active· EmollientEffect: HighAn emollient that helps soften the skin~0.45–0.65%
Histidine hclKey activeEffect: HighA salt of an amino-acid that helps attract water to the upper layer of the skin. Might be helpful in restoring the skin barrier function~0.5–0.75%
PolymethylsilsesquioxaneKey activeEffect: HighA silicone that improves product texture and helps dissolve other ingredients. Can form a non-greasy film on the skin to prevent moisture loss~0.75–1.15%
Sodium hyaluronateKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin~0.7–1.05%
Sodium lactateKey active· HumectantEffect: HighHelps attract water to the upper layer of the skin. Is often used to adjust the pH level of the product~0.5–0.75%
Sodium pcaKey active· HumectantEffect: HighNaturally present in skin and helps to attract water to its upper layer~0.5–0.75%
Hydrolyzed collagenKey active· Humectant, EmollientEffect: HighA typically plant-derived compound that is supposed mimic human collagen. Cannot penetrate the skin barrier so is not particularly useful in skincare products beyond attracting water to the upper layer of the skin~0.7–1.05%
Saccharomyces ferment filtrateKey active· HumectantEffect: HighA product of yeast fermentation. Helps attract water to the upper layer of the skin~2.6–3.2%
Jojoba estersKey active· EmollientEffect: HighAn emollient made of jojoba oil. Helps soften the skin and support its barrier function~0.55–0.85%
CarnosineKey active· HumectantEffect: HighA type of peptide. It attracts water to the upper layer of the skin. It can help neutralize free radicals in skin combatting the sun damage~0.3–0.6%
Ceramide npHero· EmollientEffect: HighA type of lipid similar to ceramides naturally present in skin. Helps to soften the upper layer of the skin and supports the skin barrier function to keep it hydrated. Can help to prevent inflammation in skin~0.45–0.65%
Coco-caprylate/caprateKey active· EmollientEffect: MediumHelps to soften the upper layer of the skin without creating a greasy texture~0.55–0.8%
Cetyl alcoholKey active· EmollientEffect: MediumA non-drying alcohol that works to soften the skin and stabilize product formulations helping oil and water mix together~0.55–0.85%
Vegetable oilKey active· EmollientEffect: MediumAn oil from a mixture of different vegetables. Helps soften the upper layer of the skin~0.55–0.85%
Cetyl palmitateKey active· EmollientEffect: MediumAn emollient that helps soften the skin and is used to improve product texture and stability~1.1–1.3%
Behenyl alcohol· Emollient, OcclusiveEffect: LowNon-drying alcohol that helps water and oil mix together. Also serves as an emollient~1.6–2%
Stearic acid· EmollientEffect: LowHelps oil and water mix together and works as an emollient~1.5–1.8%
Glyceryl stearate· EmollientEffect: LowAn emollient that softens the skin and forms a protective layer on its surface. Helps water and oil mix together~0.6–0.85%
Polyglyceryl-6 distearateEffect: LowHelps oil and water mix together while softening the upper layer of the skin~0.55–0.8%
Calcium gluconate· HumectantEffect: LowHelps attract water to the upper layer of the skin and helps to improve appearance of the product~0.45–0.65%
Oleic acid· EmollientEffect: LowHelps soften the upper layer of the skin. At the same time, it can weaken the skin's barrier enhancing penetration of other ingredients and increasing the risk of skin dryness~0.95–1.15%
Butyrospermum parkii butterUnder-dosedEffect: HighA great moisturising ingredient that softens the skin and reduces water loss from its upper layer. It also can be helpful in protecting skin from free radicals~0.55–0.85%
Lactic acidUnder-dosedEffect: HighAn exfoliating and moisturizing alpha-hydroxy acid (AHA). Typically causes less irritation than other AHAs, for example, glycolic acid. At high concentrations (about 15%), lactic acid can help reduce lines and wrinkles. Recent studies show that lactic acid can support the "good" bacteria living on skin's surface (healthy skin microbiome)~0.3–0.55%
GluconolactoneUnder-dosedEffect: HighA polyhydroxy acid (PHA) that helps shed the dead cells from the skin surface revealing smoother skin. Is believed to be genter than AHAs. It helps attract water to the upper layer of the skin and can stimulate production of skin's own hyaluronic acid resulting in improved hydration levels. It has been shown to be helpful against acne and clogged pores if used consistently (e.g over a period of 12 weeks) in high enough concentration. It can help reduce fine lines and wrinkles and improve skin tone with long-term application. Can help neutralize free radicals~0.5–0.75%
TocopherolEffect: Low, below effective dosePure form of vitamin E. Can help moisturise and protect the skin from free radicals. Often used to help stabilise other ingredients or the formula itself~0.55–0.8%
LecithinEffect: Low, below effective doseUsed mostly for creating emulsions - helping oil and water mix together. Helps soften the upper layer of the skin~0.3–0.6%
Evens skin tone
4 ingredients credited for this claim
Strong support
What the product description says
“Diamond Powder works to scatter light to impart a healthy-looking luminosity while bioengineered Ginger Root Extract helps to prevent the appearance of age spots and discolouration.”
Source: Lookfantastic CA

This product can help reduce hypepigmentation and even out the skin tone because it contains the following effective ingredients: tetrahexyldecyl ascorbate

The following ingredient (ingredients) in this product might be helpful, but there is no evidence to confirm that it actually can help even out the skin tone: ferulic acid.

Keep in mind that you would need to apply any topical skincare targetted at hypigmentation consistently for a couple of months to get a result. No topical skincare product can help get rid of hyperpigmentation (including post-acne marks and age spots) instantly.

Tetrahexyldecyl ascorbateKey activeEffect: HighBeing a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.~4.2–5.1%
Ferulic acidKey activeEffect: MediumA potent anti-oxidant that has been shown to be effective in neutralizing free radicals in skin. There seem to have a synergetic effect of ferulic acid, vitamin E and C, meaning that when the ingredients are used together, they enhance each other's ability protect the skin against free radicals. Ferulic acid also helps to stabilize other ingredients - including vitamins C and E. It can help to even out the skin tone. Ferulic acid is approved for use as a sunscreen ingredient in Japan in concentrations up to 10%~1.2–1.4%
GluconolactoneUnder-dosedEffect: HighA polyhydroxy acid (PHA) that helps shed the dead cells from the skin surface revealing smoother skin. Is believed to be genter than AHAs. It helps attract water to the upper layer of the skin and can stimulate production of skin's own hyaluronic acid resulting in improved hydration levels. It has been shown to be helpful against acne and clogged pores if used consistently (e.g over a period of 12 weeks) in high enough concentration. It can help reduce fine lines and wrinkles and improve skin tone with long-term application. Can help neutralize free radicals~0.5–0.75%
Lactic acidUnder-dosedEffect: HighAn exfoliating and moisturizing alpha-hydroxy acid (AHA). Typically causes less irritation than other AHAs, for example, glycolic acid. At high concentrations (about 15%), lactic acid can help reduce lines and wrinkles. Recent studies show that lactic acid can support the "good" bacteria living on skin's surface (healthy skin microbiome)~0.3–0.55%
Anti-oxidation
Not advertised by the brand · 9 ingredients credited for this claim
Strong support

This product contains antioxidants (carnosine, ferulic acid, tetrahexyldecyl ascorbate) that can help neutralize free radicals in skin. By doing so, they can lessen the damage the skin gets from the UV light (sun).

The following ingredients - haematococcus pluvialis extract also can have an antioxidant effect, but there is less evidence to confirm their effectiveness in skin.

Tetrahexyldecyl ascorbateKey activeEffect: HighBeing a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.~4.2–5.1%
Ferulic acidKey activeEffect: HighA potent anti-oxidant that has been shown to be effective in neutralizing free radicals in skin. There seem to have a synergetic effect of ferulic acid, vitamin E and C, meaning that when the ingredients are used together, they enhance each other's ability protect the skin against free radicals. Ferulic acid also helps to stabilize other ingredients - including vitamins C and E. It can help to even out the skin tone. Ferulic acid is approved for use as a sunscreen ingredient in Japan in concentrations up to 10%~1.2–1.4%
CarnosineKey activeEffect: HighA type of peptide. It attracts water to the upper layer of the skin. It can help neutralize free radicals in skin combatting the sun damage~0.3–0.6%
Haematococcus pluvialis extractKey activeEffect: MediumGreen algae extract that might contain antioxidant astaxanthin~0.5–0.8%
Tocopheryl acetateEffect: LowA more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.~1.8–2.2%
Zingiber officinale root extractEffect: LowA plant extract that can contain an irritating essential oil. Might have some anti-oxidant effect, but evidence is lacking~0.55–0.8%
TocopherolUnder-dosedEffect: HighPure form of vitamin E. Can help moisturise and protect the skin from free radicals. Often used to help stabilise other ingredients or the formula itself~0.55–0.8%
GluconolactoneUnder-dosedEffect: MediumA polyhydroxy acid (PHA) that helps shed the dead cells from the skin surface revealing smoother skin. Is believed to be genter than AHAs. It helps attract water to the upper layer of the skin and can stimulate production of skin's own hyaluronic acid resulting in improved hydration levels. It has been shown to be helpful against acne and clogged pores if used consistently (e.g over a period of 12 weeks) in high enough concentration. It can help reduce fine lines and wrinkles and improve skin tone with long-term application. Can help neutralize free radicals~0.5–0.75%
Butyrospermum parkii butterEffect: Low, below effective doseA great moisturising ingredient that softens the skin and reduces water loss from its upper layer. It also can be helpful in protecting skin from free radicals~0.55–0.85%

Can it cause trouble?

Irritancy
1 strong irritant: Zingiber officinale root extract
Medium risk
We flagged 19 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
Curcuma longa root extractA plant extract that can contain an active compound curcumin, that may have some anti-inflammatory properties when applied to the skin, but solid research is lacking and the typical concentration used in skincare products is too low. Can be an irritantHigh~0.55–0.8%est.
Zingiber officinale root extractA plant extract that can contain an irritating essential oil. Might have some anti-oxidant effect, but evidence is lackingHigh~0.55–0.8%est.
Tetrahexyldecyl ascorbateBeing a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.Medium~4.2–5.1%est.
Tocopheryl acetateA more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.Medium~1.8–2.2%est.
Polyglyceryl-2 stearateHelps water and oil mix togetherMedium~0.95–1.15%est.
Oleic acidHelps soften the upper layer of the skin. At the same time, it can weaken the skin's barrier enhancing penetration of other ingredients and increasing the risk of skin drynessMedium~0.95–1.15%est.
Haematococcus pluvialis extractGreen algae extract that might contain antioxidant astaxanthinMedium~0.5–0.8%est.
GluconolactoneA polyhydroxy acid (PHA) that helps shed the dead cells from the skin surface revealing smoother skin. Is believed to be genter than AHAs. It helps attract water to the upper layer of the skin and can stimulate production of skin's own hyaluronic acid resulting in improved hydration levels. It has been shown to be helpful against acne and clogged pores if used consistently (e.g over a period of 12 weeks) in high enough concentration. It can help reduce fine lines and wrinkles and improve skin tone with long-term application. Can help neutralize free radicalsMedium~0.5–0.75%est.
Polyglyceryl-6 distearateHelps oil and water mix together while softening the upper layer of the skinMedium~0.55–0.8%est.
Disodium edtaStabilizes the product formulationMedium~0.5–0.75%est.
Jojoba estersAn emollient made of jojoba oil. Helps soften the skin and support its barrier functionMedium~0.55–0.85%est.
Sodium stearoyl lactylateHelps oil and water mix togetherMedium~0.55–0.8%est.
Sodium lactateHelps attract water to the upper layer of the skin. Is often used to adjust the pH level of the productMedium~0.5–0.75%est.
Polyglyceryl-3 beeswaxHelps water and oil mix together. Could be an allergen (beeswax)Medium~0.55–0.8%est.
Lactic acidAn exfoliating and moisturizing alpha-hydroxy acid (AHA). Typically causes less irritation than other AHAs, for example, glycolic acid. At high concentrations (about 15%), lactic acid can help reduce lines and wrinkles. Recent studies show that lactic acid can support the "good" bacteria living on skin's surface (healthy skin microbiome)Medium~0.3–0.55%est.
Polyglyceryl-10 laurateHelps water and oil mix togetherMedium~0.25–0.5%est.
EthylhexylglycerinA preservativeMedium~0.2–0.35%est.
EdtaHelp to stabilize the product formulationMedium~0.15–0.25%est.
Potassium sorbateA preservativeMedium~0.15–0.25%est.
Comedogenic
1 ingredient rated 2 or more on the 0–5 pore-clogging scale
1 flagged
These ingredients have a comedogenic rating of 2 or more on a 0–5 scale; the table shows each one's rating. In leave-on products they can clog pores in acne-prone skin.
IngredientFunctionRatingEst. amount
Butyrospermum parkii butterA great moisturising ingredient that softens the skin and reduces water loss from its upper layer. It also can be helpful in protecting skin from free radicals3/5~0.55–0.85%est.
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Ingredients

Filter by role to see what each ingredient is doing.

Water~45–55%
Formula
Irritation risk
Low

Plain old water

More about Water
Propanediol~4.5–5.5%
Formula
Irritation risk
Low

Acts as a solvent for other ingredients. Speeds up the absorption of other ingredients into the skin

More about Propanediol
Tetrahexyldecyl ascorbate~4.2–5.1%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Evens skin toneAnti-agingAnti-oxidation

Being a lipid soluble form of vitamin C, it is more stable than ascorbic acid, but still degrades quickly and needs to be stabilized in a formulation with another ingredient. It is claimed to penetrate skin better than pure vitamin C and have the the similar benefits, but solid studies of its effectiveness are lacking. Is likely to require a higher concentration in a product than pure vitamin C to be effective. It might be able to help reduce pore clogging.

More about Tetrahexyldecyl ascorbate
C9-12 alkane~3.3–4%
Formula
Irritation risk
Low

Helps dissolve other ingredients in a formulation

More about C9-12 alkane
Saccharomyces ferment filtrate~2.6–3.2%
Key active
Irritation risk
Low
Works for
Moisturizing

A product of yeast fermentation. Helps attract water to the upper layer of the skin

More about Saccharomyces ferment filtrate
Glycerin~2.2–2.7%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Naturally present in skin. It attracts water to the upper layer of the skin working as a humectant

More about Glycerin
Tocopheryl acetate~1.8–2.2%
Irritant · medium
Irritation risk
Medium
Works for
Anti-oxidation

A more stable but less bio-available form of vitamin E compared to Tocopherol. Might help moisturize and protect the skin from free radicals, but mostly used in low concentrations to stabilize other ingredients.

More about Tocopheryl acetate
Behenyl alcohol~1.6–2%
Formula
Irritation risk
Low
Works for
Moisturizing

Non-drying alcohol that helps water and oil mix together. Also serves as an emollient

More about Behenyl alcohol
Stearic acid~1.5–1.8%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

Helps oil and water mix together and works as an emollient

More about Stearic acid
Ferulic acid~1.2–1.4%
Key active
Irritation risk
Low
Works for
Anti-oxidationEvens skin toneAnti-inflammatoryAnti-aging

A potent anti-oxidant that has been shown to be effective in neutralizing free radicals in skin. There seem to have a synergetic effect of ferulic acid, vitamin E and C, meaning that when the ingredients are used together, they enhance each other's ability protect the skin against free radicals. Ferulic acid also helps to stabilize other ingredients - including vitamins C and E. It can help to even out the skin tone. Ferulic acid is approved for use as a sunscreen ingredient in Japan in concentrations up to 10%

More about Ferulic acid
Cetyl palmitate~1.1–1.3%
Key active
Irritation risk
Low
Works for
Moisturizing

An emollient that helps soften the skin and is used to improve product texture and stability

More about Cetyl palmitate
Polyglyceryl-2 stearate~0.95–1.15%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps water and oil mix together

More about Polyglyceryl-2 stearate
Oleic acid~0.95–1.15%
Irritant · medium
Irritation risk
Medium
Works for
CleansingMoisturizingAnti-inflammatory

Helps soften the upper layer of the skin. At the same time, it can weaken the skin's barrier enhancing penetration of other ingredients and increasing the risk of skin dryness

More about Oleic acid
Soy acid~0.8–1.2%
Formula
Irritation risk
Low
Works for
Cleansing
More about Soy acid
Polymethylsilsesquioxane~0.75–1.15%
Key active
Irritation risk
Low
Works for
Moisturizing

A silicone that improves product texture and helps dissolve other ingredients. Can form a non-greasy film on the skin to prevent moisture loss

More about Polymethylsilsesquioxane
Sodium hyaluronate~0.7–1.05%
Key active
Irritation risk
Low
Works for
Moisturizing

One of the best moisturizing ingredients. Attracts water into the upper layer of the skin

More about Sodium hyaluronate
Hydrolyzed collagen~0.7–1.05%
Key active
Irritation risk
Low
Works for
Moisturizing

A typically plant-derived compound that is supposed mimic human collagen. Cannot penetrate the skin barrier so is not particularly useful in skincare products beyond attracting water to the upper layer of the skin

More about Hydrolyzed collagen
Hydrolyzed elastin~0.65–1%
Formula
Irritation risk
Low
More about Hydrolyzed elastin
Diamond powder~0.7–1%
Formula
Irritation risk
Low

Does not have known skin benefits. Might help create an optical illusion of smoother skin

More about Diamond powder
Curcuma longa root extract~0.55–0.8%
Irritant · high
Irritation risk
High
Works for
Anti-inflammatory

A plant extract that can contain an active compound curcumin, that may have some anti-inflammatory properties when applied to the skin, but solid research is lacking and the typical concentration used in skincare products is too low. Can be an irritant

More about Curcuma longa root extract
Zingiber officinale root extract~0.55–0.8%
Irritant · high
Irritation risk
High
Works for
Anti-oxidation

A plant extract that can contain an irritating essential oil. Might have some anti-oxidant effect, but evidence is lacking

More about Zingiber officinale root extract
Tocopherol~0.55–0.8%
Under-dosed
Irritation risk
Low
Works for
Anti-oxidationAnti-inflammatoryMoisturizingAnti-aging

Pure form of vitamin E. Can help moisturise and protect the skin from free radicals. Often used to help stabilise other ingredients or the formula itself

More about Tocopherol
Haematococcus pluvialis extract~0.5–0.8%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Anti-oxidation

Green algae extract that might contain antioxidant astaxanthin

More about Haematococcus pluvialis extract
Glyceryl stearate~0.6–0.85%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

An emollient that softens the skin and forms a protective layer on its surface. Helps water and oil mix together

More about Glyceryl stearate
Gluconolactone~0.5–0.75%
Under-dosedIrritant · medium
Irritation risk
Medium
Works for
ExfoliationMoisturizingAnti-agingEvens skin toneAnti-oxidationAnti-blemish

A polyhydroxy acid (PHA) that helps shed the dead cells from the skin surface revealing smoother skin. Is believed to be genter than AHAs. It helps attract water to the upper layer of the skin and can stimulate production of skin's own hyaluronic acid resulting in improved hydration levels. It has been shown to be helpful against acne and clogged pores if used consistently (e.g over a period of 12 weeks) in high enough concentration. It can help reduce fine lines and wrinkles and improve skin tone with long-term application. Can help neutralize free radicals

More about Gluconolactone
Stearyl alcohol~0.55–0.85%
Formula
Irritation risk
Low
Works for
Cleansing

An emollient that helps soften the skin

More about Stearyl alcohol
Polyglyceryl-6 distearate~0.55–0.8%
Irritant · medium
Irritation risk
Medium
Works for
CleansingMoisturizing

Helps oil and water mix together while softening the upper layer of the skin

More about Polyglyceryl-6 distearate
Carbomer~0.5–0.8%
Formula
Irritation risk
Low
Works for
Cleansing

Helps create a thicker or gel-like product texture. It is not a surfactant but can be used in gentle cleansing formulations

More about Carbomer
Coco-caprylate/caprate~0.55–0.8%
Key active
Irritation risk
Low
Works for
Moisturizing

Helps to soften the upper layer of the skin without creating a greasy texture

More about Coco-caprylate/caprate
Sodium pca~0.5–0.75%
Key active
Irritation risk
Low
Works for
Moisturizing

Naturally present in skin and helps to attract water to its upper layer

More about Sodium pca
Disodium edta~0.5–0.75%
Irritant · medium
Irritation risk
Medium

Stabilizes the product formulation

More about Disodium edta
Vegetable oil~0.55–0.85%
Key active
Irritation risk
Low
Works for
Moisturizing

An oil from a mixture of different vegetables. Helps soften the upper layer of the skin

More about Vegetable oil
Jojoba esters~0.55–0.85%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Moisturizing

An emollient made of jojoba oil. Helps soften the skin and support its barrier function

More about Jojoba esters
Sodium stearoyl lactylate~0.55–0.8%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps oil and water mix together

More about Sodium stearoyl lactylate
Cetyl alcohol~0.55–0.85%
Key active
Irritation risk
Low
Works for
CleansingMoisturizing

A non-drying alcohol that works to soften the skin and stabilize product formulations helping oil and water mix together

More about Cetyl alcohol
Butyrospermum parkii butter~0.55–0.85%
Under-dosedComedogenic 3/5
Irritation risk
Low
Comedogenicity
3/5
Works for
MoisturizingAnti-agingAnti-oxidation

A great moisturising ingredient that softens the skin and reduces water loss from its upper layer. It also can be helpful in protecting skin from free radicals

More about Butyrospermum parkii butter
Histidine hcl~0.5–0.75%
Key active
Irritation risk
Low
Works for
Moisturizing

A salt of an amino-acid that helps attract water to the upper layer of the skin. Might be helpful in restoring the skin barrier function

More about Histidine hcl
Sodium lactate~0.5–0.75%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Moisturizing

Helps attract water to the upper layer of the skin. Is often used to adjust the pH level of the product

More about Sodium lactate
Xanthan gum~0.55–0.8%
Formula
Irritation risk
Low
Works for
Cleansing

Used to create a thicker product consistency

More about Xanthan gum
Polyglyceryl-3 beeswax~0.55–0.8%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps water and oil mix together. Could be an allergen (beeswax)

More about Polyglyceryl-3 beeswax
Sodium carboxymethyl beta-glucan~0.95–1.15%
Formula
Irritation risk
Low

Helps thicken the product formulation and create a gel-like texture

More about Sodium carboxymethyl beta-glucan
Calcium gluconate~0.45–0.65%
Formula
Irritation risk
Low
Works for
Moisturizing

Helps attract water to the upper layer of the skin and helps to improve appearance of the product

More about Calcium gluconate
Ceramide np~0.45–0.65%
Hero · Moisturizing
Irritation risk
Low
Works for
MoisturizingAnti-inflammatoryReduces irritation

A type of lipid similar to ceramides naturally present in skin. Helps to soften the upper layer of the skin and supports the skin barrier function to keep it hydrated. Can help to prevent inflammation in skin

More about Ceramide np
Glycine soja sterols~0.45–0.65%
Key active
Irritation risk
Low
Works for
Moisturizing

An emollient that helps soften the skin

More about Glycine soja sterols
Sucrose stearate~0.45–0.65%
Formula
Irritation risk
Low
Works for
Cleansing

Helps water and oil mix together

More about Sucrose stearate
Carnosine~0.3–0.6%
Key active
Irritation risk
Low
Works for
MoisturizingAnti-oxidationAnti-aging

A type of peptide. It attracts water to the upper layer of the skin. It can help neutralize free radicals in skin combatting the sun damage

More about Carnosine
Lactic acid~0.3–0.55%
Under-dosedIrritant · medium
Irritation risk
Medium
Works for
MoisturizingEvens skin toneExfoliationAnti-aging

An exfoliating and moisturizing alpha-hydroxy acid (AHA). Typically causes less irritation than other AHAs, for example, glycolic acid. At high concentrations (about 15%), lactic acid can help reduce lines and wrinkles. Recent studies show that lactic acid can support the "good" bacteria living on skin's surface (healthy skin microbiome)

More about Lactic acid
Lecithin~0.3–0.6%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

Used mostly for creating emulsions - helping oil and water mix together. Helps soften the upper layer of the skin

More about Lecithin
Polyglyceryl-10 laurate~0.25–0.5%
Irritant · medium
Irritation risk
Medium
Works for
Cleansing

Helps water and oil mix together

More about Polyglyceryl-10 laurate
Wheat amino acids~0.2–0.4%
Formula
Irritation risk
Low
More about Wheat amino acids
Ethylhexylglycerin~0.2–0.35%
Irritant · medium
Irritation risk
Medium

A preservative

More about Ethylhexylglycerin
Mica~0.2–0.35%
Formula
Irritation risk
Low

Creates an illusion of smoother and more radiant skin tone. Adds shimmer to the skin by reflecting light

More about Mica
Edta~0.15–0.25%
Irritant · medium
Irritation risk
Medium

Help to stabilize the product formulation

More about Edta
Sodium hydroxide~0.15–0.25%
Formula
Irritation risk
Low

Used to adjust the product's pH

More about Sodium hydroxide
Potassium sorbate~0.15–0.25%
Irritant · medium
Irritation risk
Medium

A preservative

More about Potassium sorbate
Sodium benzoate~0.1–0.2%
Formula
Irritation risk
Low

A preservative

More about Sodium benzoate
Phenoxyethanol~0.1–0.25%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Ingredient list view

Water, Propanediol, Tetrahexyldecyl ascorbate, C9-12 alkane, Saccharomyces ferment filtrate, Glycerin, Tocopheryl acetate, Behenyl alcohol, Stearic acid, Ferulic acid, Cetyl palmitate, Polyglyceryl-2 stearate, Oleic acid, Soy acid, Polymethylsilsesquioxane, Sodium hyaluronate, Hydrolyzed collagen, Hydrolyzed elastin, Diamond powder, Curcuma longa root extract, Zingiber officinale root extract, Tocopherol, Haematococcus pluvialis extract, Glyceryl stearate, Gluconolactone, Stearyl alcohol, Polyglyceryl-6 distearate, Carbomer, Coco-caprylate/caprate, Sodium pca, Disodium edta, Vegetable oil, Jojoba esters, Sodium stearoyl lactylate, Cetyl alcohol, Butyrospermum parkii butter, Histidine hcl, Sodium lactate, Xanthan gum, Polyglyceryl-3 beeswax, Sodium carboxymethyl beta-glucan, Calcium gluconate, Ceramide np, Glycine soja sterols, Sucrose stearate, Carnosine, Lactic acid, Lecithin, Polyglyceryl-10 laurate, Wheat amino acids, Ethylhexylglycerin, Mica, Edta, Sodium hydroxide, Potassium sorbate, Sodium benzoate, Phenoxyethanol

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Product summary

Based on the ingredients included, "Peter Thomas Roth - Potent-C Moisturizer" works well for moisturizing the skin. To work well, any moisturizer needs to include a combination of water-binding and emollient ingredients. Peter Thomas Roth - Potent-C Moisturizer ticks this box. Carnosine, glycerin, hydrolyzed collagen, saccharomyces ferment filtrate and sodium hyaluronate in this product (humectants) attract water molecules to the upper layer of the skin (the water comes from the outside air or from the deeper layers of the skin if the air is dry). Emollients in this formulation (ceramide np, glycine soja sterols, hydrolyzed collagen, jojoba esters and cetyl alcohol) help to reduce the moisture loss from the skin. They also soften the skin surface and relieve the feeling of dryness and tightness.

Ingredient callouts

  • This product contains acids (gluconolactone and lactic acid). Their concentration is low, and they will not have a strong exfoliating effect. Instead, they work to support the skin natural acid mantle and to attract water (as humectants). PHAs (gluconolactone) especially are great for improving skin hydration. They might be even able to stimulate the production of skin's natural humectants and support the healthy skin microbiome.
  • Another benefit is that this moisturizer contain ceramides (ceramide np 0.45% - 0.65%). Ceramides are an important part of our natural skin barrier. The ceramides used in skincare are synthetic or come from plants. They help soften the skin and can help "fill the gaps" in the skin barrier, keeping the skin hydrated and resilient for longer.

Irritation risk

There are some common irritants in this product, including ingredients that do not have benefits for the skin. We assess the overall irritancy of this moisturizer to be medium. For a detailed overview of all potential irritants: click here

You can see the detailed formula review with the breakdown of all actives in the product and the full ingredient list with estimated concentrations in the tables below.

Price

The product retails for 72.00$ in the United States, for 85.54A$ in Australia, from 43.75£ up to 58.00£ in the United Kingdom and for 90.80CA$ in Canada.

For a detailed price comparison: click here.

Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 38 studies and safety reviews.

  1. 1
    Double-blind, half-face study comparing topical vitamin C and vehicle for rejuvenation of photodamagencbi.nlm.nih.gov
  2. 2
    Application of tetra-isopalmitoyl ascorbic acid in cosmetic formulations: Stability studies and in vivo efficacysciencedirect.com
  3. 3
    Glycerol and the skin: holistic approach to its origin and functionsncbi.nlm.nih.gov
  4. 4
    Ferulic Acid: Therapeutic Potential Through Its Antioxidant Propertyncbi.nlm.nih.gov
  5. 5
    Ferulic acid stabilizes a solution of vitamins C and E and doubles its photoprotection of skinncbi.nlm.nih.gov
  6. 6
    Antioxidant Properties of Ferulic Acid and Its Possible Applicationkarger.com
Peter Thomas Roth Potent-C Moisturizer
Peter Thomas RothPotent-C Moisturizer
Buy at Lookfantastic US$72.00Amazon

Affiliate links · As an Amazon Associate, WIMJ earns from qualifying purchases.

Buy at Lookfantastic US$72.00Amazon

As an Amazon Associate, WIMJ earns from qualifying purchases.