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Head-to-head evidence comparison — which supplement is right for you?
Niacinamide wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
5 of 7 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
4-12mg
With a meal containing fat
Softgels from Haematococcus pluvialis algae
Topical cosmetic only. Niacinamide is typically formulated at 2-5% in leave-on serums, creams, or gels and applied to clean skin once or twice daily (AM and/or PM). It layers well under sunscreen and with most other actives. There is no oral, injectable, or systemic dose in this cosmetic context — it is not ingested here. This library does not provide an ingestion protocol.
any
Leave-on topical serum or cream (2-5% niacinamide)
6-12 weeks
4 weeks
2-4 weeks
Throughout
4-12 weeks
2-12 weeks
2-8 weeks
Systematic Review and Meta-Analysis on the Effects of Astaxanthin on Human Skin Ageing
Nutrients (2021) · Meta analysis
Ingestion and/or topical usages of ASX may be effective in reducing skin ageing and have promising cosmetical potential, as it improves moisture content and elasticity and reduces wrinkles.
Effect of astaxanthin supplementation on female fertility and reproductive outcomes: a systematic review and meta-analysis of clinical and animal studies
Journal of ovarian research (2024) · Meta analysis
This systematic review shows that AST supplementation may improve assisted reproductive technology outcomes by enhancing oocyte quality and reducing OS in the reproductive organs.
Astaxanthin supplementation mildly reduced oxidative stress and inflammation biomarkers: a systematic review and meta-analysis of randomized controlled trials
Nutrition research (New York, N.Y.) (2022) · Meta analysis · n=380
Compared with placebo, astaxanthin significantly reduced blood malondialdehyde concentration (standardized mean difference [SMD]: -0.95; 95% CI, -1.67 to -0.23; P = .01).
Niacinamide: A B vitamin that improves aging facial skin appearance.
Dermatol Surg (2005) · Rct · n=50
Double-blind, left-right randomized split-face design: 5% niacinamide vs vehicle applied twice daily for 12 weeks in 50 white women with facial photoaging
The effect of niacinamide on reducing cutaneous pigmentation and suppression of melanosome transfer.
Br J Dermatol (2002) · Rct · n=18
Paired clinical trial: 18 subjects with hyperpigmentation used 5% niacinamide vs vehicle moisturizer (plus a separate facial-tanning arm)
A Double-Blind, Randomized Clinical Trial of Niacinamide 4% versus Hydroquinone 4% in the Treatment of Melasma.
Dermatol Res Pract (2011) · Rct · n=27
Split-face RCT in 27 melasma patients: 4% niacinamide vs 4% hydroquinone (HQ) for 8 weeks, both with sunscreen
Based on limited meta-analysis data showing cosmetic benefits. Conservative effectiveness estimate due to cosmetic nature of outcomes and limited study population. Higher doses may cause orange skin tint.
AI-estimated from published studies. Interpret as directional guidance.
Niacinamide has a higher evidence score (6/10 vs 5/10) and wins in 2 of 3 categories.
For skin hydration & glow, Niacinamide has a higher relevance score (65 vs 60).
No known interactions between Astaxanthin and Niacinamide have been documented in our database. However, always consult a healthcare provider before combining supplements.