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Head-to-head evidence comparison — which supplement is right for you?
Biotin vs Silica: they're closely matched on evidence (5 vs 5/10); they're alternatives for stronger nails — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Biotin and Silica are closely matched across evidence, studies, and safety.
Verdict
Probably helps
5 of 8 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both Biotin and Silica have evidence — compare verdict strength side-by-side.
2500-5000mcg (2.5-5mg) for hair/nails
Any time of day
Biotin capsules or tablets
5-10mg elemental silicon daily
With meals
Choline-stabilized orthosilicic acid (ch-OSA)
3-6 months
3-6 months
12-20 weeks
12-20 weeks
12-20 weeks
6-12 months
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.
Association between the Composition of Drinking Water and Cognitive Function in the Elderly: A Systematic Review
International journal of environmental research and public health (2024) · Systematic review · n=10
The prevalence of dementia increases with nearly 10 million new cases each year, with Alzheimer's disease contributing to 60-70% of cases.
Use of silicon for skin and hair care: an approach of chemical forms available and efficacy
Anais Brasileiros de Dermatologia (2016) · Review
On the skin, it is suggested that silicon is important for optimal collagen synthesis and activation of hydroxylating enzymes, improving skin strength and elasticity.
Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomised controlled trial
The British journal of nutrition (2015) · Rct · n=53
Isokinetic quadriceps strength (IQS) of the right leg was determined and sensory motor control (SMC) was investigated by a standardised one-leg stabilisation test.
Based on multiple meta-analyses showing dose-response relationship for occupational crystalline silica exposure and respiratory disease risk. This represents HARMFUL effects from inhalational exposure, not benefits from dietary supplementation. Studies support reducing exposure limits from 0.1 to 0.05 mg/m³. No studies provided support beneficial effects of silica supplementation for hair, nails, skin, or bone health.
AI-estimated from published studies. Interpret as directional guidance.
Both Biotin and Silica are closely matched — the best choice depends on your specific health goals.
For stronger nails, Biotin has a higher relevance score (55 vs 50).
No known interactions between Biotin and Silica have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.