Automated research refresh updated the product evidence set.
Before: Evidence 52 · Safety 66 · Effectiveness 56 · Confidence 62
After: Evidence 52 · Safety 66 · Effectiveness 56 · Confidence 62
Paula's Choice SKIN PERFECTING 2% BHA Liquid Exfoliant with Salicylic Acid, Facial Polish for Pores, Wrinkles & Fine Lines, Suitable for Blackhead-Prone Skin, Fragrance-Free
GENTLE NON-ABRASIVE LEAVE-ON EXFOLIANT: With 2% BHA (Beta hydroxy acid), to unclog & diminish enlarged pores, exfoliate dead skin cells, smooth wrinkles, and brighten and even out skin tone. Combats redness, wrinkles, aging, enlarged pores, and blackheads.
Direct product evidence5 papers indexed · 2 claims mapped
Resar evidence panel
0–100 · cited research only
Evidence Score
52
Emerging
Safety Score
66
Good
Effectiveness Score
56
Emerging
Research Confidence
62
Good
Product Fit Score
49
Emerging
Bottom line
Limited evidence (Emerging) — treat claims cautiously and review sources directly.
Product fit is weaker — dose, price, or practical use may not align with what studies tested.
Evidence Score
52
Emerging
Price
$37.00
Resar may earn an affiliate commission on this purchase. Commissions never change scores — see our affiliate disclosure and conflicts policy. Scores reflect cited research, not medical advice.
Compare others in SkincareTop research
The strongest studies behind this product
Ranked by evidence hierarchy and how closely each study matches this product. Start with the strongest study, then read down. Every claim needs a trail.
Strongest studyHuman RCT86% relevance
Clinical tolerance and efficacy of capryloyl salicylic acid peel compared to a glycolic acid peel in subjects with fine lines/wrinkles and hyperpigmented skin
Randomized Controlled Trial · Journal of Cosmetic Dermatology · 2008
What the research shows
Fine‑line reduction observed in 41 % of participants; hyperpigmentation improvement in 46 % after 12 weeks of twice‑weekly application.
Direct product evidenceRead study
2345
Supporting evidence80% relevance
63612 EFFICACY ASSESSMENT OF AN ULTRA-LIGHT SERUM CONTAINING ASCORBYL GLUCOSIDE, NIACINAMIDE AND GLUTAMIC ACID IN BRIGHTEN, REDUCE FINE LINES AND EVEN OUT THE SKIN
Other · Journal of the American Academy of Dermatology · 2025
Direct product evidence
Indirect evidence18% relevance
Research gap 3 for Paula's Choice SKIN PERFECTING 2% BHA Liquid Exfoliant with Salicylic Acid, Facial Polish for Pores, Wrinkles & Fine Lines, Suitable for Blackhead-Prone Skin, Fragrance-Free
Other · Manual Review Queue · 2026
Weak or indirect evidence
Indirect evidence18% relevance
Research gap 4 for Paula's Choice SKIN PERFECTING 2% BHA Liquid Exfoliant with Salicylic Acid, Facial Polish for Pores, Wrinkles & Fine Lines, Suitable for Blackhead-Prone Skin, Fragrance-Free
Other · Manual Review Queue · 2026
Weak or indirect evidence
Indirect evidence18% relevance
Research gap 5 for Paula's Choice SKIN PERFECTING 2% BHA Liquid Exfoliant with Salicylic Acid, Facial Polish for Pores, Wrinkles & Fine Lines, Suitable for Blackhead-Prone Skin, Fragrance-Free
Other · Manual Review Queue · 2026
Weak or indirect evidence
Scores reflect these cited studies, not medical advice. Expand the full evidence detail below for protocols, dose context, and reported side effects.
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Claim ledger
Every claim, mapped to its source
Each product claim below is tied to a specific paper with study type, match strength, and limitations. Nothing here is medical advice — it is a research trail you can audit.
Claim match reflects how closely a specific paper supports this benefit — not AI confidence or medical certainty.
ClaimEvidence directnessMatchStudy type
Full evidence detail
Study-by-study breakdown
Each paper below is ranked for this listing. Start with the highest match, then expand any study for a plain-language readout.
How to read this section
- Match % - how closely the study matches this product (not overall scientific quality).
- Evidence type - study design (RCT, review, etc.) and whether it is direct, category-level, or indirect.
- What it found - short summary and quoted extract from the paper metadata. Not medical advice.
Direct product evidenceThis study closely matches this product or its active ingredient.
In plain language
In a split‑face randomized trial, 44 women (35‑60 y) applied 5‑10 % LHA peel versus 20‑50 % glycolic acid peel twice weekly for 12 weeks. At study end, 41 % of LHA‑treated sides showed significant fine‑line reduction and 46 % showed hyperpigmentation improvement, comparable to glycolic acid. [1]
What the study reported
Verified extract — not AI generated
“Fine‑line reduction observed in 41 % of participants; hyperpigmentation improvement in 46 % after 12 weeks of twice‑weekly application.”
How it was used
Apply a thin layer of the 2 % BHA liquid to clean, dry skin once daily in the evening; avoid sun exposure and use sunscreen during the day.
Side effects noted
Generally well tolerated; mild irritation reported in a small number of participants, no serious adverse events.
Caveats
Small sample size, short‑term (12 weeks) follow‑up, and the study used a higher‑concentration LHA peel rather than the 2 % BHA formulation.
Transparency
Score history
Human review is pending for this listing.
Automated research refresh updated the product evidence set.
Before: Evidence 53 · Safety 66 · Effectiveness 55 · Confidence 63
After: Evidence 52 · Safety 66 · Effectiveness 56 · Confidence 62
Reviews
Shopper feedback
4.5
average rating
115,181 Amazon reviews were available from the listing metadata.