Loading…
We use essential cookies (authentication, your saved goals/stack) by default. With your permission we'll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Head-to-head evidence comparison — which supplement is right for you?
Azelaic Acid wins 2 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 Glycolic Acid 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%)
Topical cosmetic only. Leave-on glycolic acid is used at roughly 5-15% in lotions/serums (often at low pH), applied to clean skin a few nights per week and building as tolerated; professional peels (20-70%) are applied in-office at intervals. There is no oral, injectable, or systemic dose — it is not ingested. Pair with daily sunscreen. This library does not provide an ingestion protocol.
evening
Leave-on lotion or serum (≈5-15% glycolic acid)
Throughout
4-15 weeks
8-24 weeks
4-12 weeks
Throughout
8-12 weeks
8-16 weeks
First 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
A double-blind randomized clinical trial on the effectiveness of a daily glycolic acid 5% formulation in the treatment of photoaging.
Dermatol Surg (1998) · Rct · n=75
75 volunteers applied 5% unneutralized glycolic acid cream or placebo to face and neck daily for 3 months (double-blind, randomized, placebo-controlled)
Clinical improvement of photoaged skin with 50% glycolic acid. A double-blind vehicle-controlled study.
Dermatol Surg (1996) · Rct · n=41
41 volunteers received a 50% glycolic acid peel vs vehicle weekly for 4 weeks (in-office peel strength)
Mode of action of glycolic acid on human stratum corneum: ultrastructural and functional evaluation of the epidermal barrier.
Arch Dermatol Res (1997) · Open label
Electron-microscopy study of human skin after 3 weeks of 4% glycolic acid twice daily
Azelaic Acid has a higher evidence score (7.5/10 vs 6/10) and wins in 2 of 3 categories.
For even skin tone, Azelaic Acid has a higher relevance score (80 vs 60).
No known interactions between Azelaic Acid and Glycolic Acid have been documented in our database. However, always consult a healthcare provider before combining supplements.