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Head-to-head evidence comparison — which supplement is right for you?
Biotin vs Soy Protein: Soy Protein has the stronger overall evidence (6.5 vs 5/10); they work on different things and are often used together, not either/or. Take the 60-second quiz for a pick tailored to your goals.
Soy Protein wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
5 of 8 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
2500-5000mcg (2.5-5mg) for hair/nails
Any time of day
Biotin capsules or tablets
20-40g per serving for muscle (aim ~2-3g leucine); ~25g/day is the level associated with cholesterol lowering
any
Soy protein isolate
Raw egg protein can reduce biotin absorption
Use cooked egg protein or separate biotin from raw egg protein by 2+ hours.
3-6 months
3-6 months
6-12 weeks
4-12 weeks
Acute
Quantitative comparison of the efficacy of clinical drug treatments for primary progressive multiple sclerosis
Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia (2023) · Meta analysis · n=3779
Among these, ocrelizumab showed outstanding performance, with wCDP% of 72.6 at 96 weeks, while the proportions of rest of the drugs ranged between approximately 55-70%.
Vitamin supplementation in the treatment of optic neuritis: A systematic review and meta-analysis
Multiple sclerosis and related disorders (2025) · Meta analysis · n=2465
The effect of MD1003 (high-dose biotin), vitamin A, and vitamin D on retinal nerve fiber layer (RNFL) thickness from pooled results showed a mean change of 0.15 (SMD 0.15, 95 % CI, -0.33 to 0.64, I2 = 61 %, τ² = 0.11, p = 0.08), which was not significant.
High-dose biotin for multiple sclerosis: A systematic review and meta-analyses of randomized controlled trials
Multiple sclerosis and related disorders (2021) · Meta analysis · n=830
Pooled data for ITW25 at 12 to 15 months yielded statistical significance (RR 2.06; 95% CI 1.04-4.09; 2 trials; 796 participants; I2 = 0%) [moderate COE] favoring HDB among patients with PMS.
No Difference Between the Effects of Supplementing With Soy Protein Versus Animal Protein on Gains in Muscle Mass and Strength in Response to Resistance Exercise.
Int J Sport Nutr Exerc Metab (2018) · Meta analysis · n=266
Nine studies (266 participants); soy vs whey/animal protein with resistance training ≥6 weeks
Meta-analysis of the effects of soy protein intake on serum lipids.
N Engl J Med (1995) · Meta analysis
38 controlled clinical trials; mean soy intake ~47g/day
Effects of high-quality protein supplementation on cardiovascular risk factors in individuals with metabolic diseases: A systematic review and meta-analysis of randomized controlled trials.
Clin Nutr (2024) · Meta analysis
63 RCTs across soy, milk, whey, and casein protein
Soy Protein has a higher evidence score (6.5/10 vs 5/10) and wins in 3 of 3 categories.
Raw egg protein can reduce biotin absorption Use cooked egg protein or separate biotin from raw egg protein by 2+ hours. Consult a healthcare provider for personalized advice.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.