Peter Thomas Roth PRO Strength Retinoid Peptide Serum

Peter Thomas Roth PRO Strength Retinoid Peptide Serum

Efficacy100/100IrritancyMedium

Works for

Evens skin tone
Hydroxypinacolone retinoate
Works well
What the product description says
“Pores, Dryness, and Uneven Skin Tone”
Source: Sephora AU

This product can help reduce hypepigmentation and even out the skin tone because it contains the following effective ingredients: hydroxypinacolone retinoate.

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.

Hydroxypinacolone retinoateHeroEffect: HighA derivative of the most potent form of vitamin A, retinoic acid. The ingredient can be sold under name Granactive Retinoid. Note that if a skincare brand discloses the concentration of Granactive Retinoid in a product, the concentration refers to a diluted form of Hydroxypinacolone Retinoate: 1% of Granactive Retinoid corresponds to 0.1% of Hydroxypinacolone Retinoate. Hydroxypinacolone Retinoate (HPR) is a unique derivative of retinoic acid because it can directly work in the skin and does not require additional conversion steps. According to studies done by the manufacturer on models of human skin (not real people), this derivative is more effective than other cosmetic versions of retinoids (such as retinol, retinaldehyde, and retinyl palmitate), and, at the same time, causes less irritation. It has been also demonstrated to be more stable than retinol which makes formulating with easier and increases the chances that a product with it will maintain its effectiveness after opening. The packaging should still ideally be air-tight. HPR is available over the counter in the EU, UK, Asia, Australia and New Zealand, but is only with a prescription in Canada.~0.2–0.75%
Moisturizing
Palmitoyl hexapeptide-14, Ceramide np + 19 more
Works well
What the product description says
“Squalane, ceramide NP, and a super-lipid complex moisturise and help minimise the potential for irritation and dryness.”
Source: Sephora AU

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: sodium hyaluronate, sodium pca.

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: caprylic/capric triglyceride, dimethicone.

The following ingredients in this product are especially good for supporting the skin barrier and helping with the hydration level: ceramide np, palmitoyl hexapeptide-14

Palmitoyl hexapeptide-14HeroEffect: High~0.55–1.25%
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~0.5–1.2%
DimethiconeKey active· Emollient, OcclusiveEffect: HighA silicone that helps to reduce water loss from the surface of the skin. Can temporarily "fill in" lines and wrinkles, absorb oil, and create a nice product finish~6.1–9.2%
CyclopentasiloxaneKey active· EmollientEffect: MediumA silicone that helps improve the product texture and spreadability. Can absorb oil creating a short-term mattifying effect on the skin~2.1–3.2%
Caprylic/capric triglycerideKey active· Emollient, OcclusiveEffect: HighA good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin~1.3–1.9%
Coco-caprylate/caprateKey active· EmollientEffect: MediumHelps to soften the upper layer of the skin without creating a greasy texture~1.3–2%
Laminaria ochroleuca extractKey activeEffect: HighHelps attract water to the upper layer of the skin~0.35–0.8%
SqualaneKey active· Emollient, OcclusiveEffect: HighAn oil naturally present in skin. Works as an emollient to soften the skin and form a protective layer on its surface without a greasy feeling.~0.3–0.75%
Phytosteryl canola glyceridesKey activeEffect: MediumHelps soften the upper layer of the skin~0.3–0.75%
Ethylhexyl hydroxystearateKey active· Emollient, OcclusiveEffect: HighHelps soften the upper layer of the skin and reduce water loss from it~0.2–0.7%
Sodium hyaluronateKey active· HumectantEffect: HighOne of the best moisturizing ingredients. Attracts water into the upper layer of the skin~0.2–0.75%
Sodium pcaKey active· HumectantEffect: HighNaturally present in skin and helps to attract water to its upper layer~0.2–0.7%
TrioleinKey activeEffect: HighHelps soften the upper layer of the skin~0.15–0.65%
Isononyl isononanoate· Emollient, OcclusiveEffect: LowForms a protective film on the surface of the skin to prevent moisture loss. Gives a velvety feel to products while reducing tackiness~5.1–7.7%
Polysilicone-11Effect: LowA silicone that forms a light film on the skin surface helping to bind water and temporarily absorb oils creating a matt and powdery feel~1.7–2.5%
Palmitic acid· EmollientEffect: LowAn emollient that is naturally present in skin and helps soften it~0.3–0.7%
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~0.3–0.75%
Stearic acidEffect: Low, below effective doseHelps oil and water mix together and works as an emollient~0.35–0.85%
LecithinEffect: Low, below effective doseUsed mostly for creating emulsions - helping oil and water mix together. Helps soften the upper layer of the skin~0.3–0.75%
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~0.2–0.7%
Linoleic acidUnder-dosedAn excellent emollient. Helps soften the skin, restore its barrier function, and can help to calm down inflammation. It can be helpful to prevent blemishes and clogged pores~0.35–0.8%
Anti-aging
Hydroxypinacolone retinoate, Palmitoyl hexapeptide-14 + 1 more
Works well
What the product description says
“This serum works to reduce the look of fine lines and wrinkles.”
Source: Sephora AU

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

These ingredients in the product can also be helpful, even though there is less evidence for their effectiveness: palmitoyl hexapeptide-14.

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.

Hydroxypinacolone retinoateHeroEffect: HighA derivative of the most potent form of vitamin A, retinoic acid. The ingredient can be sold under name Granactive Retinoid. Note that if a skincare brand discloses the concentration of Granactive Retinoid in a product, the concentration refers to a diluted form of Hydroxypinacolone Retinoate: 1% of Granactive Retinoid corresponds to 0.1% of Hydroxypinacolone Retinoate. Hydroxypinacolone Retinoate (HPR) is a unique derivative of retinoic acid because it can directly work in the skin and does not require additional conversion steps. According to studies done by the manufacturer on models of human skin (not real people), this derivative is more effective than other cosmetic versions of retinoids (such as retinol, retinaldehyde, and retinyl palmitate), and, at the same time, causes less irritation. It has been also demonstrated to be more stable than retinol which makes formulating with easier and increases the chances that a product with it will maintain its effectiveness after opening. The packaging should still ideally be air-tight. HPR is available over the counter in the EU, UK, Asia, Australia and New Zealand, but is only with a prescription in Canada.~0.2–0.75%
Palmitoyl hexapeptide-14Key activeEffect: Medium~0.55–1.25%
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~0.2–0.7%
Anti-blemish
Hydroxypinacolone retinoate, Linoleic acid
Works well
What the product description says
“Pores, Dryness, and Uneven Skin Tone”
Source: Sephora AU

This product can help reduce breakouts and clogged pores because it contains the following ingredient: hydroxypinacolone retinoate. This ingredient is used for treating acne and can have a noticeable effect.

Hydroxypinacolone retinoateHeroEffect: HighA derivative of the most potent form of vitamin A, retinoic acid. The ingredient can be sold under name Granactive Retinoid. Note that if a skincare brand discloses the concentration of Granactive Retinoid in a product, the concentration refers to a diluted form of Hydroxypinacolone Retinoate: 1% of Granactive Retinoid corresponds to 0.1% of Hydroxypinacolone Retinoate. Hydroxypinacolone Retinoate (HPR) is a unique derivative of retinoic acid because it can directly work in the skin and does not require additional conversion steps. According to studies done by the manufacturer on models of human skin (not real people), this derivative is more effective than other cosmetic versions of retinoids (such as retinol, retinaldehyde, and retinyl palmitate), and, at the same time, causes less irritation. It has been also demonstrated to be more stable than retinol which makes formulating with easier and increases the chances that a product with it will maintain its effectiveness after opening. The packaging should still ideally be air-tight. HPR is available over the counter in the EU, UK, Asia, Australia and New Zealand, but is only with a prescription in Canada.~0.2–0.75%
Linoleic acidUnder-dosedAn excellent emollient. Helps soften the skin, restore its barrier function, and can help to calm down inflammation. It can be helpful to prevent blemishes and clogged pores~0.35–0.8%

Can it cause trouble?

Irritancy
2 strong irritants: Hydroxypinacolone retinoate, Zingiber officinale root extract
Medium risk
We flagged 8 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
Hydroxypinacolone retinoateA derivative of the most potent form of vitamin A, retinoic acid. The ingredient can be sold under name Granactive Retinoid. Note that if a skincare brand discloses the concentration of Granactive Retinoid in a product, the concentration refers to a diluted form of Hydroxypinacolone Retinoate: 1% of Granactive Retinoid corresponds to 0.1% of Hydroxypinacolone Retinoate. Hydroxypinacolone Retinoate (HPR) is a unique derivative of retinoic acid because it can directly work in the skin and does not require additional conversion steps. According to studies done by the manufacturer on models of human skin (not real people), this derivative is more effective than other cosmetic versions of retinoids (such as retinol, retinaldehyde, and retinyl palmitate), and, at the same time, causes less irritation. It has been also demonstrated to be more stable than retinol which makes formulating with easier and increases the chances that a product with it will maintain its effectiveness after opening. The packaging should still ideally be air-tight. HPR is available over the counter in the EU, UK, Asia, Australia and New Zealand, but is only with a prescription in Canada.High~0.2–0.75%est.
Zingiber officinale root extractA plant extract that can contain an irritating essential oil. Might have some anti-oxidant effect, but evidence is lackingHigh~0.35–0.75%est.
Caprylic/capric triglycerideA good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerinMedium~1.3–1.9%est.
Hordeum vulgare extractA plant extract that might have some anti-oxidant properties. Avoid if you are sensitive to glutenMedium~0.45–1%est.
Cucumis sativus extract—Medium~0.35–0.8%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~0.3–0.75%est.
EthoxydiglycolHelps to improve the product consistencyMedium~0.1–0.45%est.
EthylhexylglycerinA preservativeMedium~0.1–0.45%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
Laminaria ochroleuca extractHelps attract water to the upper layer of the skin3/5~0.35–0.8%est.

User reviews

Would you recommend?
No community reviews yet.

Be the first — your take helps the next person decide.

Ingredients

Filter by role to see what each ingredient is doing.

C9-12 alkane~23–35%
Formula
Irritation risk
Low

Helps dissolve other ingredients in a formulation

More about C9-12 alkane
Dimethicone~6.1–9.2%
Key active
Irritation risk
Low
Works for
MoisturizingMattifying

A silicone that helps to reduce water loss from the surface of the skin. Can temporarily "fill in" lines and wrinkles, absorb oil, and create a nice product finish

More about Dimethicone
Isononyl isononanoate~5.1–7.7%
Formula
Irritation risk
Low
Works for
Moisturizing

Forms a protective film on the surface of the skin to prevent moisture loss. Gives a velvety feel to products while reducing tackiness

More about Isononyl isononanoate
Dimethyl isosorbide~3.7–5.5%
Formula
Irritation risk
Low

Used to dissolve other ingredients in a product and can enhance their ability to penetrate the skin

More about Dimethyl isosorbide
Trisiloxane~2.7–4.1%
Formula
Irritation risk
Low

A type of silicone. Used to improve product texture

More about Trisiloxane
Cyclopentasiloxane~2.1–3.2%
Key active
Irritation risk
Low
Works for
MoisturizingMattifying

A silicone that helps improve the product texture and spreadability. Can absorb oil creating a short-term mattifying effect on the skin

More about Cyclopentasiloxane
Polysilicone-11~1.7–2.5%
Formula
Irritation risk
Low
Works for
MattifyingMoisturizing

A silicone that forms a light film on the skin surface helping to bind water and temporarily absorb oils creating a matt and powdery feel

More about Polysilicone-11
Coco-caprylate/caprate~1.3–2%
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
Caprylic/capric triglyceride~1.3–1.9%
Key activeIrritant · medium
Irritation risk
Medium
Works for
Moisturizing

A good mix of fatty acids that forms a protective layer on the skin. Improves the shelf life of products. Derived from coconut and glycerin

More about Caprylic/capric triglyceride
Hydroxypinacolone retinoate~0.2–0.75%
Hero · Anti-aging, Evens skin tone, Anti-blemishIrritant · high
Irritation risk
High
Works for
Anti-agingAnti-blemishEvens skin toneExfoliation

A derivative of the most potent form of vitamin A, retinoic acid. The ingredient can be sold under name Granactive Retinoid. Note that if a skincare brand discloses the concentration of Granactive Retinoid in a product, the concentration refers to a diluted form of Hydroxypinacolone Retinoate: 1% of Granactive Retinoid corresponds to 0.1% of Hydroxypinacolone Retinoate. Hydroxypinacolone Retinoate (HPR) is a unique derivative of retinoic acid because it can directly work in the skin and does not require additional conversion steps. According to studies done by the manufacturer on models of human skin (not real people), this derivative is more effective than other cosmetic versions of retinoids (such as retinol, retinaldehyde, and retinyl palmitate), and, at the same time, causes less irritation. It has been also demonstrated to be more stable than retinol which makes formulating with easier and increases the chances that a product with it will maintain its effectiveness after opening. The packaging should still ideally be air-tight. HPR is available over the counter in the EU, UK, Asia, Australia and New Zealand, but is only with a prescription in Canada.

More about Hydroxypinacolone retinoate
Palmitoyl hexapeptide-14~0.55–1.25%
Hero · Moisturizing
Irritation risk
Low
Works for
MoisturizingAnti-aging
More about Palmitoyl hexapeptide-14
Ceramide np~0.5–1.2%
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
Helianthus annuus seed extract~0.4–0.95%
Formula
Hordeum vulgare extract~0.45–1%
Irritant · medium
Irritation risk
Medium
Works for
Anti-oxidation

A plant extract that might have some anti-oxidant properties. Avoid if you are sensitive to gluten

More about Hordeum vulgare extract
Cucumis sativus extract~0.35–0.8%
Irritant · medium
Laminaria ochroleuca extract~0.35–0.8%
Key activeComedogenic 3/5
Irritation risk
Low
Comedogenicity
3/5
Works for
Moisturizing

Helps attract water to the upper layer of the skin

More about Laminaria ochroleuca extract
Zingiber officinale root extract~0.35–0.75%
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
Phytosteryl canola glycerides~0.3–0.75%
Key active
Irritation risk
Low
Works for
Moisturizing

Helps soften the upper layer of the skin

More about Phytosteryl canola glycerides
Sodium hyaluronate~0.2–0.75%
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
Sodium pca~0.2–0.7%
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
Squalane~0.3–0.75%
Key active
Irritation risk
Low
Works for
Moisturizing

An oil naturally present in skin. Works as an emollient to soften the skin and form a protective layer on its surface without a greasy feeling.

More about Squalane
Tocopherol~0.2–0.7%
Formula
Irritation risk
Low
Works for
Anti-oxidationMoisturizingAnti-agingAnti-inflammatory

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
Lecithin~0.3–0.75%
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
Linoleic acid~0.35–0.8%
Under-dosed
Irritation risk
Low
Works for
CleansingMoisturizingAnti-blemish

An excellent emollient. Helps soften the skin, restore its barrier function, and can help to calm down inflammation. It can be helpful to prevent blemishes and clogged pores

More about Linoleic acid
Oleic acid~0.3–0.75%
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
Palmitic acid~0.3–0.7%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

An emollient that is naturally present in skin and helps soften it

More about Palmitic acid
Stearic acid~0.35–0.85%
Formula
Irritation risk
Low
Works for
CleansingMoisturizing

Helps oil and water mix together and works as an emollient

More about Stearic acid
Hydroxystearic acid~0.3–0.75%
Formula
Irritation risk
Low
Works for
Cleansing
More about Hydroxystearic acid
Triolein~0.15–0.65%
Key active
Irritation risk
Low
Works for
Moisturizing

Helps soften the upper layer of the skin

More about Triolein
Bisabolol~0.15–0.55%
Formula
Irritation risk
Low
Works for
Reduces irritationAnti-inflammatoryAnti-oxidation

An active component of chamomile plant that historically has been used to calm down irritated skin. A recent study shows that bisabolol indeed can have some anti-inflammatory effect on skin, even though conclusive data is lacking. Bisabolol has a sweet floral scent and can be added to products for its aromatic properties

More about Bisabolol
Ethylhexyl hydroxystearate~0.2–0.7%
Key active
Irritation risk
Low
Works for
Moisturizing

Helps soften the upper layer of the skin and reduce water loss from it

More about Ethylhexyl hydroxystearate
Ethoxydiglycol~0.1–0.45%
Irritant · medium
Irritation risk
Medium

Helps to improve the product consistency

More about Ethoxydiglycol
Ethylhexylglycerin~0.1–0.45%
Irritant · medium
Irritation risk
Medium

A preservative

More about Ethylhexylglycerin
Water~0.1–0.4%
Formula
Irritation risk
Low

Plain old water

More about Water
Mica~0.1–0.45%
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
Phenoxyethanol~0.1–0.4%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Ingredient list view

C9-12 alkane, Dimethicone, Isononyl isononanoate, Dimethyl isosorbide, Trisiloxane, Cyclopentasiloxane, Polysilicone-11, Coco-caprylate/caprate, Caprylic/capric triglyceride, Hydroxypinacolone retinoate, Palmitoyl hexapeptide-14, Ceramide np, Helianthus annuus seed extract, Hordeum vulgare extract, Cucumis sativus extract, Laminaria ochroleuca extract, Zingiber officinale root extract, Phytosteryl canola glycerides, Sodium hyaluronate, Sodium pca, Squalane, Tocopherol, Lecithin, Linoleic acid, Oleic acid, Palmitic acid, Stearic acid, Hydroxystearic acid, Triolein, Bisabolol, Ethylhexyl hydroxystearate, Ethoxydiglycol, Ethylhexylglycerin, Water, Mica, Phenoxyethanol

Compare prices

Retailers ranked by price — lowest first.

No pricing data available yet for this product.

Worth comparing, line by line.

Match % combines shared ingredients, the first five ingredients, shared actives and hero ingredients, irritancy (lower counts in the alternative's favour), texture and body area. Only products in the same routine step are compared.

Side-by-side comparison of this product against its closest alternatives
Peter Thomas RothPRO Strength Retinoid Peptide SerumYOUR PRODUCTBeauty PieSuper Retinal Rejuvenating SerumDr. DeneseHemp Super SerumCliniqueSmart Clinical Repair Wrinkle Correcting Serum
Match—72%69%64%
Price—$55.00—$57.99
Shared key ingredients—7 of 168 of 165 of 16
Key difference—RetinalTetrahexyldecyl AscorbateAscorbyl Glucoside
Irritancy Medium Medium Medium Medium
Drying alcohol————
View product Shop Shop Shop

More alternatives: Be Minimalist Granactive Retinoid 02%Lancer Skincare Younger Pure Youth Serum with MIMIXYL

Cheaper alternatives? Browse formulas in the same category.
We compare ingredient profiles across our catalog — pick the closest match for your budget.
Open dupe finder

Product summary

"Peter Thomas Roth - PRO Strength Retinoid Peptide Serum" is effective for: Evens skin tone, Moisturizing, Anti-aging and Anti-blemish

Ingredient callouts

  • this product contains an effective form of Retinoids (vitamin A): hydroxypinacolone retinoate 0.20% - 0.75%. Retinoids are potent multitasking actives. They work to improve and prevent early signs of aging, reduce hyperpigmentation (age spots and post-acne marks), and prevent inflamed blemishes and clogged pores. The downside of Retinoids is that they can be irritating. If you are not already using a Retinoid in your routine, it is best to start slowly and apply the Retinoid product only a few times per week. If your skin tolerates it well, you can gradually increase the frequency to daily.
  • Ceramides (ceramide np 0.50% - 1.20%). Ceramides are a type of lipids that our skin produces itself. They are a building block of the skin's barrier. Ceramides used in skincare are synthetic or extracted from plants. They work well for softening the skin surface and "patch holes" in the skin's barrier.
  • Peptides (palmitoyl hexapeptide-14 0.55% - 1.25%). Peptides are a very big group of ingredients. They all consist of a different combination of aminoacids. Our skin produces Peptides naturally. Some of them work as natural antibiotics, promote wound-healing and production of collagen. The scientists are still studying how effective the topical application of Peptides is, but it is very likely that theynare helpful. Peptides might be able to support skin barrier restoration and even have an anti-aging benefit. At the very least, they certainly help attract water to the skin and support the hydration in this way.
  • We love that there is also Linoleic Acid in this product (0.35% - 0.80%). Linoleic Acid is one of the skin's natural emollients. It supports the skin barrier and can even help reduce clogged pores.
  • Humectants (sodium pca 0.20% - 0.70% and sodium hyaluronate 0.20% - 0.75%). These ingredients help attract water to the upper layer of the skin and improve the skin hydration.

Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 21 studies and safety reviews.

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
Peter Thomas Roth PRO Strength Retinoid Peptide Serum
Peter Thomas RothPRO Strength Retinoid Peptide Serum

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

As an Amazon Associate, WIMJ earns from qualifying purchases.