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Head-to-head evidence comparison — which supplement is right for you?
Adapalene wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Adapalene and Tretinoin (Retin-A) have evidence — compare verdict strength side-by-side.
Topical use. Adapalene 0.1% (OTC) or 0.3% (prescription) gel/cream is applied as a thin layer to the whole affected area once daily, usually at night, starting every other day and building to nightly as tolerated. Full benefit takes ~8-12 weeks. There is no oral or systemic dose — it is not ingested. It is most effective combined with benzoyl peroxide. This library does not provide an ingestion protocol.
evening
Adapalene 0.1% gel/cream (OTC), applied nightly to the whole area
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
Throughout
First weeks
12-24 weeks
12-24 weeks
Months
8-12 weeks
A comparison of the efficacy and tolerability of adapalene 0.1% gel versus tretinoin 0.025% gel in patients with acne vulgaris: a meta-analysis of five randomized trials.
Br J Dermatol (1998) · Meta analysis · n=900
Meta-analysis of five randomized investigator-blind trials (900 patients) in mild-to-moderate acne
Adapalene-benzoyl peroxide, a fixed-dose combination for the treatment of acne vulgaris: results of a multicenter, randomized double-blind, controlled study.
J Am Acad Dermatol (2007) · Rct · n=517
Pivotal 12-week double-blind RCT (n=517) of adapalene-BPO vs adapalene, BPO, or vehicle
Topical preparations for the treatment of mild-to-moderate acne vulgaris: systematic review and network meta-analysis.
Br J Dermatol (2021) · Systematic review
Systematic review and network meta-analysis of 40 trials (18,089 participants) of topical acne treatments
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
Adapalene has a higher evidence score (9/10 vs 8/10) and wins in 2 of 3 categories.
For clearer skin (acne), Adapalene has a higher relevance score (85 vs 75).
No known interactions between Adapalene and Tretinoin (Retin-A) have been documented in our database. However, always consult a healthcare provider before combining supplements.