The Receipt
- 01The strongest receipt among retinoids, with the irritation to match. Use it with a prescriber.
Education, not a diagnosis. If something changes quickly, hurts, bleeds, or worries you, see a dermatologist.
Ingredient Receipt · Retinoids
Tretinoin
INCI: Tretinoin
Tretinoin (retinoic acid) is the prescription retinoid with the deepest evidence for acne and sun-related aging. How it differs from retinol and what using it is like.
- Acne & breakouts
- Lines & firmness
- Texture & pores
- Dark marks & tone
01 · In plain English
Tretinoin is what retinol becomes once skin converts it. As a prescription, it’s the benchmark other retinoids are compared to.
02 · What it does
Tretinoin acts directly on retinoic acid receptors in skin, influencing cell turnover and collagen.
Controlled trials going back to the 1980s show improvement in sun-damaged (photoaged) skin, and acne guidelines recommend topical retinoids as core treatment.
Because it’s already the active form, it’s stronger and more irritating than over-the-counter retinol.
03 · Who it’s for
- Acne, under a clinician’s guidance.
- Sun-related fine lines, texture and uneven tone.
04 · What the evidence says
- Acne treatment and prevention.well-supported
- Fine lines, roughness and mottled pigmentation from sun damage.well-supported
05 · Myths, checked
“Retinoids thin your skin.”
The outermost layer can look smoother and may flake early on, but studies of tretinoin in photoaging show increased collagen, not thinning of the skin overall.
limited evidence
06 · Insufficient evidence
- Starting at the highest strength to speed things up.
07 · How to use it
- Prescription only. Pea-sized amount at night, often starting every second or third night.
- Moisturizer and daily sunscreen are part of the routine.
- Not used in pregnancy.
08 · Pairs well / go carefully
Pairs well with
- Gentle cleanser, ceramide moisturizer, sunscreen.
Go carefully with
- Applying at the same time as benzoyl peroxide unless your prescriber advises a combined product.
- Exfoliating acids on the same nights early on.
Sources (4)
- Weiss JS, et al. Topical tretinoin improves photoaged skin: a double-blind vehicle-controlled study. JAMA. 1988.
- Mukherjee S, et al. Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. Clin Interv Aging. 2006.
- Reynolds RV, et al. Guidelines of care for the management of acne vulgaris. J Am Acad Dermatol. 2024.
- Thielitz A, Gollnick H. Topical retinoids in acne vulgaris: update on efficacy and safety. Am J Clin Dermatol. 2008.