Loading…
We use essential cookies (authentication, your saved goals/stack) by default. With your permission we'll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Head-to-head evidence comparison — which supplement is right for you?
Mandelic Acid (topical) and Tretinoin (Retin-A) are closely matched across evidence, studies, and safety.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Mandelic Acid (topical) and Tretinoin (Retin-A) have evidence — compare verdict strength side-by-side.
Topical cosmetic only. Leave-on mandelic acid is used at roughly 5-10% in serums; professional peels use higher strengths (often a salicylic-mandelic combination). Apply to clean skin, building frequency as tolerated, with daily sunscreen. There is no oral or systemic dose — it is not ingested. This library does not provide an ingestion protocol.
evening
Leave-on serum (≈5-10% mandelic acid) or a professional (salicylic-)mandelic peel
Prescription topical: a pea-sized amount of 0.025%-0.1% cream or gel applied to clean, dry skin once nightly. Start low-strength and every-other-night to build tolerance. A prescription drug used under clinician direction — not a supplement regimen.
before-bed
Topical cream or gel, 0.025%-0.1% (prescription)
Throughout
8-12 weeks
8-12 weeks
Throughout
12-24 weeks
12-24 weeks
Months
8-12 weeks
Comparative study of efficacy and safety of 45% mandelic acid versus 30% salicylic acid peels in mild-to-moderate acne vulgaris.
J Cosmet Dermatol (2020) · Rct · n=50
RCT (n=50): 45% mandelic acid vs 30% salicylic acid peels every 2 weeks for six sessions over 12 weeks
Comparative Evaluation of Efficacy and Tolerability of Glycolic Acid, Salicylic Mandelic Acid, and Phytic Acid Combination Peels in Melasma.
Dermatol Surg (2016) · Rct · n=90
RCT (n=90): glycolic 35% vs salicylic-mandelic vs phytic acid peels for melasma over 12 weeks
Comparative Study of 35% Glycolic Acid, 20% Salicylic-10% Mandelic Acid, and Phytic Acid Combination Peels in the Treatment of Active Acne and Postacne Pigmentation.
J Cutan Aesthet Surg (2019) · Rct · n=45
RCT (n=45): glycolic vs salicylic-mandelic vs phytic peels biweekly for six sessions
Topical tretinoin improves photoaged skin. A double-blind vehicle-controlled study.
JAMA (1988) · Rct
Randomized, double-blind, vehicle-controlled trial of topical tretinoin for photoaged forearm and facial skin
Tretinoin emollient cream: a new therapy for photodamaged skin.
J Am Acad Dermatol (1992) · Rct
Multicenter double-blind vehicle-controlled trial of tretinoin emollient cream for photodamaged skin
Long-term treatment of photoaged human skin with topical retinoic acid improves epidermal cell atypia and thickens the collagen band in papillary dermis.
J Am Acad Dermatol (2005) · Open label
Long-term topical retinoic acid on photoaged human skin assessed histologically
Both Mandelic Acid (topical) and Tretinoin (Retin-A) are closely matched — the best choice depends on your specific health goals.
For clearer skin (acne), Tretinoin (Retin-A) has a higher relevance score (75 vs 60).
No known interactions between Mandelic Acid (topical) and Tretinoin (Retin-A) have been documented in our database. However, always consult a healthcare provider before combining supplements.