At a glance
- Also known as: all-trans retinoic acid, Retin-A
- Typical strength: 0.025%–0.1% cream or gel (Rx)
- Works with: moisturizer, sunscreen, niacinamide
- Evidence level: Strong (decades of RCTs)
Why it matters
If skincare had a gold standard, tretinoin would be it. Unlike over-the-counter retinol, tretinoin is the active retinoid your skin uses directly — no conversion needed. That's why it works faster and harder, and why it needs a prescription.
How it works
Tretinoin binds directly to retinoic acid receptors in skin cells. This speeds up how quickly skin cells turn over, keeps pores from clogging, and — over months — signals fibroblasts in the dermis to build new collagen. That combination is why the same molecule treats both acne and wrinkles.
Types & derivatives
Retinoids exist on a potency ladder: retinol and retinaldehyde (OTC, converted in skin) sit below tretinoin (prescription, active form), with tazarotene and oral isotretinoin stronger still.
What to expect
Expect an adjustment period. Weeks 2–6 often bring dryness, flaking, and sometimes a temporary acne flare ("purging"). Start 2–3 nights per week, apply a pea-sized amount to dry skin, and always pair with sunscreen. Visible smoothing and clearing typically take 12–16 weeks; collagen benefits build over 6–12 months.
Frequently asked questions
Can I use tretinoin under my eyes? Yes, cautiously — the skin is thin, so use a tiny amount less often.
Is tretinoin safe in pregnancy? No. Topical retinoids are avoided in pregnancy; talk to your doctor.