Retinoids: what the evidence says
Over-the-counter retinol versus prescription retinoids, expected timelines and side effects.
By Faciem research · 2026-08-28 · 6 min read
What they do
Retinoids speed up skin cell turnover and stimulate collagen. The evidence for texture, fine lines and pigmentation is among the strongest in dermatology.
Over the counter versus prescription
Retinol 0.3–0.5% is a reasonable start. Tretinoin is stronger and requires a prescription; discuss it with a physician or pharmacist.
Timeline
Irritation in weeks one to four, visible change at eight to twelve weeks, full effect at six months.