What Is Retinol? — The Complete Guide
Retinol is a vitamin A derivative — the most-evidence-supported anti-aging ingredient in skincare.
The science.
Retinol is a topical form of vitamin A. Once applied, it converts to retinaldehyde, then to retinoic acid (the active form). Retinoic acid binds to cell receptors and instructs them to behave more like younger cells — faster turnover, more collagen, more even pigmentation.
How it works
Retinol works at the cellular level. It increases cell turnover, stimulates fibroblasts to produce collagen, regulates sebum, and reduces hyperpigmentation. It's the only over-the-counter ingredient with peer-reviewed evidence for anti-aging.
Right for which skin types?
Ages 28+ for prevention. 35+ for active treatment. Pause during pregnancy and breastfeeding.
How to use it
Start at 0.025% three nights a week. Apply to dry skin after cleansing. Buffer with moisturiser if reactive. Build to nightly over 12 weeks. Always wear SPF the next morning.
Side effects
Initial dryness, flaking, redness ('retinisation period'). Usually settles by week 4. If persistent, switch to gentler form (0.025% buffered) or to bakuchiol.
Top recommendations.
- Retinol 0.5% by The Ordinary — $15 · Best entry-level
- Retinol 1.0% by Paula's Choice — $80 · Mid-strength benchmark
- Tretinoin 0.025% by Rx — $45 · Prescription, fastest results
Common questions.
Retinol vs tretinoin?
Tretinoin is the active form; retinol converts in skin. Tretinoin works faster but harder to tolerate. Both deliver same results at correct dosing.
How long until results?
12-16 weeks for visible improvement. Most users abandon at week 6 just before payoff.
Can I use retinol while pregnant?
No. Use bakuchiol or peptides during pregnancy.