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Head-to-head evidence comparison — which supplement is right for you?
Tretinoin (Retin-A) wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Azelaic Acid and Tretinoin (Retin-A) have evidence — compare verdict strength side-by-side.
Topical only. OTC cosmetic azelaic acid is typically around 10%; prescription strengths are 15% gel/foam (rosacea) and 20% cream (acne), applied as a thin layer to clean skin once or twice daily. There is no oral, injectable, or systemic dose. For rosacea or persistent acne, the prescription form under a clinician is the evidence-based route. This library does not provide an ingestion protocol.
any
Leave-on topical gel, foam, or cream (OTC ~10%, or prescription 15-20%)
Prescription topical: a pea-sized amount of 0.025%-0.1% cream or gel applied to clean, dry skin once nightly. Start low-strength and every-other-night to build tolerance. A prescription drug used under clinician direction — not a supplement regimen.
before-bed
Topical cream or gel, 0.025%-0.1% (prescription)
Throughout
4-15 weeks
8-24 weeks
4-12 weeks
12-24 weeks
12-24 weeks
Months
8-12 weeks
Efficacy and safety of azelaic acid (15%) gel as a new treatment for papulopustular rosacea: results from two vehicle-controlled, randomized phase III studies.
J Am Acad Dermatol (2003) · Rct · n=664
Two double-blind, vehicle-controlled phase III RCTs (664 patients total) of 15% azelaic acid gel twice daily for moderate papulopustular rosacea
A comparison of 15% azelaic acid gel and 0.75% metronidazole gel in the topical treatment of papulopustular rosacea: results of a randomized trial.
Arch Dermatol (2003) · Rct · n=251
Multicenter, double-blind, randomized head-to-head trial in 251 patients with moderate papulopustular rosacea over 15 weeks
Interventions for rosacea.
Cochrane Database Syst Rev (2015) · Systematic review
Cochrane review of 106 RCTs (13,631 participants) of rosacea treatments with GRADE quality assessment
Topical tretinoin improves photoaged skin. A double-blind vehicle-controlled study.
JAMA (1988) · Rct
Randomized, double-blind, vehicle-controlled trial of topical tretinoin for photoaged forearm and facial skin
Tretinoin emollient cream: a new therapy for photodamaged skin.
J Am Acad Dermatol (1992) · Rct
Multicenter double-blind vehicle-controlled trial of tretinoin emollient cream for photodamaged skin
Long-term treatment of photoaged human skin with topical retinoic acid improves epidermal cell atypia and thickens the collagen band in papillary dermis.
J Am Acad Dermatol (2005) · Open label
Long-term topical retinoic acid on photoaged human skin assessed histologically
Tretinoin (Retin-A) has a higher evidence score (8/10 vs 7.5/10) and wins in 1 of 3 categories.
For even skin tone, Azelaic Acid has a higher relevance score (80 vs 60).
No known interactions between Azelaic Acid and Tretinoin (Retin-A) have been documented in our database. However, always consult a healthcare provider before combining supplements.