Tretinoin

Prescription vitamin A derivative that accelerates cell turnover and collagen production.

Also known as: Retinoic acid, all-trans retinoic acid (ATRA), Retin-A, Renova

What it is

Tretinoin is a prescription-only retinoid—the active form of vitamin A that directly binds to retinoic acid receptors in skin cells. It is the gold-standard retinoid in dermatology and requires a physician prescription.

What it does

Tretinoin accelerates epidermal cell turnover, increases collagen and elastin synthesis, and normalizes sebum production. It reduces fine lines, improves skin texture and tone, fades hyperpigmentation and post-inflammatory erythema, and is highly effective for acne and photoaging. Results typically appear within 8–12 weeks with consistent use.

The evidence

Strong clinical evidence supports tretinoin for photoaging, acne, and hyperpigmentation; decades of dermatological use and multiple RCTs confirm efficacy and safety at appropriate concentrations (0.025–0.1%). It is the benchmark against which other retinoids are measured.

Best for

Photoaging, fine lines, acne, hyperpigmentation, and uneven texture; suitable for most skin types when dosed and introduced gradually.

Pairs well with

Sunscreen (essential), moisturizers, niacinamide, azelaic acid, vitamin C (in separate AM/PM routines), and hydrating serums to buffer irritation.

Use cautiously with

Other potentially irritating actives (benzoyl peroxide, high-dose AHAs/BHAs, vitamin C at high pH) during initial weeks; avoid with other retinoids; use cautiously with topical antibiotics that may increase photosensitivity.

Cautions

Prescription-only; causes retinization (redness, peeling, sensitivity) for 4–8 weeks; increases sun sensitivity—daily SPF 30+ is mandatory. Contraindicated in pregnancy and breastfeeding. Start low (0.025%) and titrate slowly; not for sensitive or compromised skin barriers without medical supervision.