What it is
Regulatory status: FDA-approved topical prescription medicine for acne; some formulations have evidence for photodamaged skin but product indications vary
Mechanism evidence: human
Tretinoin binds nuclear retinoic-acid receptors and changes epidermal differentiation and collagen-related signalling. Effects and irritation depend on vehicle, concentration, frequency and sun exposure.
What it is, why people use it, the evidence, and what to know before trying it.
Regulatory status: FDA-approved topical prescription medicine for acne; some formulations have evidence for photodamaged skin but product indications vary
Mechanism evidence: human
Topical tretinoin is an established acne medicine and has evidence for selected signs of photoaging. It does not reverse whole-body biological age, and tolerability and formulation should be managed with a clinician.
Confidence: strong
Contraindications, interactions and clinical cautions from reviewed sources.
Irritation, dryness, peeling and photosensitivity are common. Avoid eyes and damaged skin, use sun protection, and review pregnancy plans with a prescriber. Strengths and vehicles are not interchangeable, and more irritation is not more benefit.
This review does not automatically apply to:
Public protocols that include Topical tretinoin. Open one to see the full context and source.
Dose and schedule patterns reported in public protocols; these are observations, not prescribing advice. Private and hidden usage is excluded.
Continue into interventions that appear alongside this one.