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Head-to-head evidence comparison — which supplement is right for you?
Azelaic Acid 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 Kojic 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. Kojic acid is typically used at roughly 1-2% in leave-on serums or creams (or as the more stable kojic acid dipalmitate), applied to areas of hyperpigmentation once or twice daily, often alongside other brighteners and daily sunscreen. There is no oral, injectable, or systemic dose — it is not ingested. This library does not provide an ingestion protocol.
any
Leave-on topical serum or cream (≈1-2% kojic acid, or kojic acid dipalmitate)
Throughout
4-15 weeks
8-24 weeks
4-12 weeks
Throughout
8-12 weeks
Throughout
1-12 months
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
Treatment of melasma using kojic acid in a gel containing hydroquinone and glycolic acid.
Dermatol Surg (1999) · Rct · n=40
Split-face randomized design in 40 women with epidermal melasma: 2% kojic acid added to a 10% glycolic acid + 2% hydroquinone base vs the base alone
Efficacy and safety of topical agents in the treatment of melasma: What's evidence? A systematic review and meta-analysis.
J Cosmet Dermatol (2023) · Meta analysis
Pooled 45 efficacy studies (2359 patients) of topical melasma treatments using MASI standardised mean differences
Kojic Acid vis-a-vis its Combinations with Hydroquinone and Betamethasone Valerate in Melasma: A Randomized, Single Blind, Comparative Study.
Indian J Dermatol (2013) · Rct · n=80
80 melasma patients randomized over 12 weeks to kojic acid 1% alone, kojic acid + hydroquinone 2%, kojic acid + betamethasone, or all three (MASI-assessed)
Azelaic Acid has a higher evidence score (7.5/10 vs 6/10) and wins in 1 of 3 categories.
For even skin tone, Azelaic Acid has a higher relevance score (80 vs 70).
No known interactions between Azelaic Acid and Kojic Acid have been documented in our database. However, always consult a healthcare provider before combining supplements.