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Peter Thomas Roth PRO Strength 10% PHA Exfoliating Clarifying Liquid
Peter Thomas Roth

Peter Thomas Roth PRO Strength 10% PHA Exfoliating Clarifying Liquid

Efficacy93/100IrritancyMedium
See all ingredients

Works for

Anti-blemish
Salicylic acid, Gluconolactone + 2 more
Works well
What the product description says
“Dullness, Uneven Texture, and Acne and Blemishes Formulation.”
Source: Sephora

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

The following ingredient (ingredients) in this product might be helpful, but there is no evidence to confirm that it actually works: capryloyl salicylic acid, gluconolactone, glycolic acid

Salicylic acidHeroEffect: HighUsed for skin exfoliation. It has an anti-inflammatory and anti-bacterial effect, helps to unclog pores, prevent blemishes and speed up healing of the existing ones. Sometimes referred to as a BHA (beta-hydroxy acid)~0.5–1.2%
GluconolactoneKey activeEffect: 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~4.9–7.4%
Glycolic acidKey activeEffect: MediumAn alpha-hydroxy acid (AHA) that helps to remove the dead skin cells on the surface of the skin reveling a more even, smoother complexation. It is also able to stimulate collagen production with long-term use. Could help to reduce pore congestion. It can be irritating to the skin. Apply sunscreen daily if using products with glycolic acid~2–3%
Capryloyl salicylic acidKey activeEffect: Medium~0.5–1.15%
Exfoliation
Gluconolactone, Glycolic acid + 3 more
Works well
What the product description says
“PRO Strength 10% PHA Exfoliating Clarifying Liquid”
From product name

This product can help exfoliate the skin. In other words, it helps break down the bonds between dead cells on the surface of the skin and speed up the skin turnover. Skin often appears softer and brighter after exfoliation, but overdoing it can result in disrupted skin barrier. The following ingredient is doing the exfoliating job in this product: capryloyl salicylic acid, gluconolactone, glycolic acid, lactic acid, salicylic acid.

GluconolactoneKey activeEffect: 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~4.9–7.4%
Glycolic acidKey activeEffect: HighAn alpha-hydroxy acid (AHA) that helps to remove the dead skin cells on the surface of the skin reveling a more even, smoother complexation. It is also able to stimulate collagen production with long-term use. Could help to reduce pore congestion. It can be irritating to the skin. Apply sunscreen daily if using products with glycolic acid~2–3%
Lactic acidKey activeEffect: 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)~1.4–2.1%
Salicylic acidKey activeEffect: HighUsed for skin exfoliation. It has an anti-inflammatory and anti-bacterial effect, helps to unclog pores, prevent blemishes and speed up healing of the existing ones. Sometimes referred to as a BHA (beta-hydroxy acid)~0.5–1.2%
Capryloyl salicylic acidKey activeEffect: High~0.5–1.15%
Evens skin tone
Gluconolactone, Glycolic acid + 3 more
Works well
What the product description says
“Dullness, Uneven Texture, and Acne and Blemishes Formulation.”
Source: Sephora

This product can help reduce hypepigmentation and even out the skin tone because it contains the following effective ingredients: gluconolactone, glycolic acid, lactic acid, salicylic acid

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: capryloyl salicylic 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.

GluconolactoneKey activeEffect: 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~4.9–7.4%
Glycolic acidKey activeEffect: HighAn alpha-hydroxy acid (AHA) that helps to remove the dead skin cells on the surface of the skin reveling a more even, smoother complexation. It is also able to stimulate collagen production with long-term use. Could help to reduce pore congestion. It can be irritating to the skin. Apply sunscreen daily if using products with glycolic acid~2–3%
Lactic acidKey activeEffect: 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)~1.4–2.1%
Capryloyl salicylic acidKey activeEffect: Medium~0.5–1.15%
Salicylic acidEffect: LowUsed for skin exfoliation. It has an anti-inflammatory and anti-bacterial effect, helps to unclog pores, prevent blemishes and speed up healing of the existing ones. Sometimes referred to as a BHA (beta-hydroxy acid)~0.5–1.2%
Moisturizing
Gluconolactone, Lactic acid + 4 more
Works
What the product description says
“An alpha hydroxy acid that helps improve the look of radiance, uneven skin tone and smoothness. . Salicylic Acid (BHA) 0.”
Source: Sephora

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: lactic acid.

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: sphingolipids.

GluconolactoneKey activeEffect: 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~4.9–7.4%
Lactic acidKey active· HumectantEffect: 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)~1.4–2.1%
SphingolipidsKey active· EmollientEffect: HighSphingolipids are a group of lipids with a common chemical structure. Some of them are naturally present in skin and can be converted to ceramides~0.4–0.9%
PhospholipidsKey activeEffect: MediumEmollients that are naturaly present in skin. In addition, they help water and oil mix together in the product~0.4–0.95%
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%
LecithinEffect: Low, below effective doseUsed mostly for creating emulsions - helping oil and water mix together. Helps soften the upper layer of the skin~0.2–0.75%
Anti-aging
Side benefit · Gluconolactone, Glycolic acid + 3 more
Works well

This product can help reduce and prevent fine lines and wrinkles, improve skin elasticity and firmness because it contains gluconolactone, glycolic acid.

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

GluconolactoneKey activeEffect: 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~4.9–7.4%
Glycolic acidKey activeEffect: HighAn alpha-hydroxy acid (AHA) that helps to remove the dead skin cells on the surface of the skin reveling a more even, smoother complexation. It is also able to stimulate collagen production with long-term use. Could help to reduce pore congestion. It can be irritating to the skin. Apply sunscreen daily if using products with glycolic acid~2–3%
Lactic acidKey activeEffect: 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)~1.4–2.1%
Ascorbyl palmitateEffect: Low, below effective doseBeing a lipid soluble form of vitamin C, it is more stable and can penetrate the skin better than L-Ascorbic acid. It is effective in protecting the skin from free radicals, as well as evening the skin tone, but is less effective in stimulating collagen production compared to L-Ascorbic acid.~0.3–0.7%
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-oxidation
Side benefit · Gluconolactone, Ascorbyl palmitate + 1 more
May help

This product contains antioxidants (gluconolactone) that can help neutralize free radicals in skin to lessen the damage it gets from the UV light (sun). There is some human evidence for this effect in skin, though it is smaller or less consistent than the evidence for the best antioxidants.

GluconolactoneKey activeEffect: 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~4.9–7.4%
Ascorbyl palmitateEffect: Low, below effective doseBeing a lipid soluble form of vitamin C, it is more stable and can penetrate the skin better than L-Ascorbic acid. It is effective in protecting the skin from free radicals, as well as evening the skin tone, but is less effective in stimulating collagen production compared to L-Ascorbic acid.~0.3–0.7%
TocopherolUnder-dosedPure 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%

Can it cause trouble?

Irritancy
1 strong irritant: Hamamelis virginiana water
Medium risk
We flagged 12 ingredients with irritancy potential. Severity depends on your sensitivity threshold; the table lists the worst offenders first.
IngredientFunctionIrritationEst. amount
Glycolic acidAn alpha-hydroxy acid (AHA) that helps to remove the dead skin cells on the surface of the skin reveling a more even, smoother complexation. It is also able to stimulate collagen production with long-term use. Could help to reduce pore congestion. It can be irritating to the skin. Apply sunscreen daily if using products with glycolic acidHigh~2–3%est.
Hamamelis virginiana waterA plant extract that can help calm down inflammation in skin. Can, however, itself be irritatingHigh~1.5–2.3%est.
Salicylic acidUsed for skin exfoliation. It has an anti-inflammatory and anti-bacterial effect, helps to unclog pores, prevent blemishes and speed up healing of the existing ones. Sometimes referred to as a BHA (beta-hydroxy acid)High~0.5–1.2%est.
Capryloyl salicylic acid—High~0.5–1.15%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~4.9–7.4%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~1.4–2.1%est.
EthoxydiglycolHelps to improve the product consistencyMedium~1.2–1.8%est.
Ascorbyl palmitateBeing a lipid soluble form of vitamin C, it is more stable and can penetrate the skin better than L-Ascorbic acid. It is effective in protecting the skin from free radicals, as well as evening the skin tone, but is less effective in stimulating collagen production compared to L-Ascorbic acid.Medium~0.3–0.7%est.
Potassium sorbateA preservativeMedium~0.1–0.5%est.
Benzoic acidA preservativeMedium~0.1–0.3%est.
Sodium citrateHelps to control the skin's pH level. Maintains the skin's natural film of amino-lactic acids and oils. Helps to preserve productsMedium~0.05–0.25%est.
Disodium edtaStabilizes the product formulationMedium~0.01–0.1%est.
Comedogenic
Clean of flagged comedogenic ingredients
None flagged
Alternatives
Cheaper, or higher on efficacy
AHA PHA BHA 32%
Be Minimalist AHA PHA BHA 32%
Cheaper84% match
$15.46
Pro Liquid Exfoliant
Bliss Pro Liquid Exfoliant
CheaperHigher efficacy · 100/10079% match
$23.81
View all alternatives

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Ingredients

Filter by role to see what each ingredient is doing.

Water~40–60%
Formula
Irritation risk
Low

Plain old water

More about Water
Gluconolactone~4.9–7.4%
Key activeIrritant · 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
Isopentyldiol~3.9–5.8%
Formula
Irritation risk
Low

Helps dissolve other ingredients in a formulation

More about Isopentyldiol
Sodium hydroxide~2.7–4.1%
Formula
Irritation risk
Low

Used to adjust the product's pH

More about Sodium hydroxide
Glycolic acid~2–3%
Key activeIrritant · high
Irritation risk
High
Works for
Anti-agingEvens skin toneExfoliationAnti-blemish

An alpha-hydroxy acid (AHA) that helps to remove the dead skin cells on the surface of the skin reveling a more even, smoother complexation. It is also able to stimulate collagen production with long-term use. Could help to reduce pore congestion. It can be irritating to the skin. Apply sunscreen daily if using products with glycolic acid

More about Glycolic acid
Hamamelis virginiana water~1.5–2.3%
Irritant · high
Irritation risk
High
Works for
Anti-inflammatory

A plant extract that can help calm down inflammation in skin. Can, however, itself be irritating

More about Hamamelis virginiana water
Lactic acid~1.4–2.1%
Key activeIrritant · medium
Irritation risk
Medium
Works for
ExfoliationMoisturizingEvens skin toneAnti-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
Ethoxydiglycol~1.2–1.8%
Irritant · medium
Irritation risk
Medium

Helps to improve the product consistency

More about Ethoxydiglycol
Polyglyceryl-4 caprate~1–1.5%
Formula
Irritation risk
Low
Works for
Cleansing
More about Polyglyceryl-4 caprate
Salicylic acid~0.5–1.2%
Hero · Anti-blemishIrritant · high
Irritation risk
High
Works for
Anti-inflammatoryExfoliationAnti-blemishAntibacterialEvens skin tone

Used for skin exfoliation. It has an anti-inflammatory and anti-bacterial effect, helps to unclog pores, prevent blemishes and speed up healing of the existing ones. Sometimes referred to as a BHA (beta-hydroxy acid)

More about Salicylic acid
Capryloyl salicylic acid~0.5–1.15%
Key activeIrritant · high
Irritation risk
High
Works for
ExfoliationEvens skin toneAnti-blemish
More about Capryloyl salicylic acid
Phospholipids~0.4–0.95%
Key active
Irritation risk
Low
Works for
Moisturizing

Emollients that are naturaly present in skin. In addition, they help water and oil mix together in the product

More about Phospholipids
Sphingolipids~0.4–0.9%
Key active
Irritation risk
Low
Works for
Moisturizing

Sphingolipids are a group of lipids with a common chemical structure. Some of them are naturally present in skin and can be converted to ceramides

More about Sphingolipids
Ascorbyl palmitate~0.3–0.7%
Irritant · medium
Irritation risk
Medium
Works for
Anti-agingAnti-oxidation

Being a lipid soluble form of vitamin C, it is more stable and can penetrate the skin better than L-Ascorbic acid. It is effective in protecting the skin from free radicals, as well as evening the skin tone, but is less effective in stimulating collagen production compared to L-Ascorbic acid.

More about Ascorbyl palmitate
Tocopherol~0.2–0.7%
Under-dosed
Irritation risk
Low
Works for
Anti-oxidationAnti-agingMoisturizingAnti-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~0.2–0.75%
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
Potassium sorbate~0.1–0.5%
Irritant · medium
Irritation risk
Medium

A preservative

More about Potassium sorbate
Sodium benzoate~0.1–0.35%
Formula
Irritation risk
Low

A preservative

More about Sodium benzoate
Benzoic acid~0.1–0.3%
Irritant · medium
Irritation risk
Medium

A preservative

More about Benzoic acid
Sodium citrate~0.05–0.25%
Irritant · medium
Irritation risk
Medium

Helps to control the skin's pH level. Maintains the skin's natural film of amino-lactic acids and oils. Helps to preserve products

More about Sodium citrate
Hydrogenated palm glycerides citrate~0.1–0.3%
Formula
Irritation risk
Low

Helps soften the upper layer of the skin

More about Hydrogenated palm glycerides citrate
Disodium edta~0.01–0.1%
Irritant · medium
Irritation risk
Medium

Stabilizes the product formulation

More about Disodium edta
Phenoxyethanol~0.05–0.2%
Formula
Irritation risk
Low

A preservative. It helps prevent bacterial growth in cosmetic products

More about Phenoxyethanol
Ingredient list view

Water, Gluconolactone, Isopentyldiol, Sodium hydroxide, Glycolic acid, Hamamelis virginiana water, Lactic acid, Ethoxydiglycol, Polyglyceryl-4 caprate, Salicylic acid, Capryloyl salicylic acid, Phospholipids, Sphingolipids, Ascorbyl palmitate, Tocopherol, Lecithin, Potassium sorbate, Sodium benzoate, Benzoic acid, Sodium citrate, Hydrogenated palm glycerides citrate, Disodium edta, Phenoxyethanol

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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 10% PHA Exfoliating Clarifying LiquidYOUR PRODUCTBe MinimalistAHA PHA BHA 32%BlissPro Liquid ExfoliantGlossierSolution
Match—84%79%79%
Price$58.00$15.46−$42.54$23.81−$34.19$30.00−$28.00
Shared key ingredients—4 of 74 of 74 of 7
Key difference—Sodium HyaluronateCeramide NgNiacinamide
Irritancy Medium Low Medium Low
Drying alcohol————
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Sources cited in this review

Every concentration estimate and effectiveness label is anchored to one of these 23 studies and safety reviews.

  1. 1
    A comparative study of gluconolactone versus benzoyl peroxide in the treatment of acnencbi.nlm.nih.gov
  2. 2
    The Polyhydroxy Acid Gluconolactone Protects Against Ultraviolet Radiation in an In Vitro Model of Cutaneous Photoagingonlinelibrary.wiley.com
  3. 3
    Applications of hydroxy acids: classification, mechanisms, and photoactivityncbi.nlm.nih.gov
  4. 4
    The efficacy of glycolic acid, salicylic acid, gluconolactone, and licochalcone A combined with 0.1% adapalene vs adapalene monotherapy in mild-to-moderate acne vulgaris: a double-blinded within-person comparative studydovepress.com
  5. 5
    A polyhydroxy acid skin care regimen provides antiaging effects comparable to an alpha-hydroxyacid regimenncbi.nlm.nih.gov
  6. 6
    The use of polyhydroxy acids (PHAs) in photoaged skin
Peter Thomas Roth PRO Strength 10% PHA Exfoliating Clarifying Liquid
Peter Thomas RothPRO Strength 10% PHA Exfoliating Clarifying Liquid
Buy at Sephora$58.00Amazon

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

Buy at Sephora$58.00Amazon

As an Amazon Associate, WIMJ earns from qualifying purchases.