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Head-to-head evidence comparison — which supplement is right for you?
Adapalene vs Tretinoin (Retin-A): they're closely matched on evidence (9 vs 8/10); they're alternatives for clearer skin (acne) — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Adapalene and Tretinoin (Retin-A) are closely matched across evidence, studies, and safety.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (2)
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
Both Adapalene and Tretinoin (Retin-A) are closely matched — the best choice depends on your specific health goals.
For clearer skin (acne), Adapalene has a higher relevance score (85 vs 75).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
AM/PM order, what to combine vs separate, and why sunscreen always comes first.
Bakuchiol vs retinol vs adapalene vs tretinoin — pick by strength and tolerance, not hype.
Benzoyl peroxide & retinoids → salicylic/azelaic/niacinamide → naturals, tiered by evidence.
Commonly recommended vs ask-your-clinician vs avoid — a general, safety-first overview.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.