Silica Supplements: Bones, Hair, Skin, and What the Research Shows

Silica Supplements: Bones, Hair, Skin, and What the Research Shows

Silicon is a mineral that gets far less attention than calcium or magnesium, yet it plays a critical role in connective tissue health. Your bones, cartilage, skin, hair, and nails all contain silicon — and its levels decline with age.

This guide is for anyone considering a silica supplement, whether the goal is bone health, skin elasticity, or stronger hair.

TL;DR

• Silicon intake is associated with bone mineral density in the Framingham cohort study (Jugdaohsingh et al., 2004)
• Choline-stabilized orthosilicic acid (ch-OSA) improved hair tensile strength in women (Wickett et al., 2007)
• The same form improved skin elasticity and reduced nail brittleness (Barel et al., 2005)
• Effective dose: 5–10 mg bioavailable silicon per day (in ch-OSA form)
• Silicon bioavailability varies enormously between forms — silicon dioxide absorbs minimally

What Is Silicon and Why Does It Matter?

Silicon (Si) is a metalloid found throughout the body in connective-tissue-rich structures. It participates in collagen synthesis and cross-linking, which gives connective tissue its strength and elasticity (Carlisle, 1972). Without adequate silicon, collagen formation is less efficient.

Silicon levels in tissues decline with age. A 70-year-old's bones contain roughly 50% less silicon than a 20-year-old's. This decline correlates with reduced bone density, though a definitive causal link has not yet been established.

How Silicon Works in the Body

Bone Health

The Framingham Offspring cohort study showed that higher dietary silicon intake was associated with greater bone mineral density in men and premenopausal women (Jugdaohsingh et al., 2004). Silicon appears to promote osteoblast (bone-building cell) activity while inhibiting osteoclasts (bone-resorbing cells) (Reffitt et al., 2003).

Skin, Hair, and Nails

Barel et al. (2005) conducted a double-blind, placebo-controlled trial with 50 women receiving 10 mg silicon per day in ch-OSA form for 20 weeks. Results:

• Skin elasticity improved significantly
• Nail brittleness decreased
• Hair morphology improved

Wickett et al. (2007) confirmed increased hair tensile strength in women with fine hair using the same protocol.

Collagen Support

Silicon is required for the enzyme prolyl hydroxylase, which is critical in collagen maturation. This means silicon deficiency can affect collagen quality throughout the body — in bones, cartilage, skin, and blood vessel walls.

Silica Forms: Bioavailability Is Everything

Critically important: most cheap silica supplements contain silicon dioxide, which absorbs at less than 1%. Clinical results have been achieved primarily with ch-OSA.

Recommended Dosage

• Preventive dose: 5 mg bioavailable silicon per day
• Therapeutic dose (hair/skin): 10 mg per day in ch-OSA form, at least 20 weeks
• Bone health: 6–12 mg per day, long-term use

Silicon is water-soluble and excreted by the kidneys. The risk of overdose is very low in healthy individuals. However, people with kidney insufficiency should consult a doctor.

Best Timing

Take silicon on an empty stomach in the morning for better absorption. ch-OSA can be taken alongside vitamin D and calcium — they support each other in bone health.

Common Mistakes

1. Buying silicon dioxide as a supplement — it is an anti-caking agent, not a bioavailable silicon source. Check the form before purchasing
2. Using it for too short a period — skin and hair results appear only after 3–5 months. A 4-week course will not produce results
3. Mixing silicon with caffeine — caffeine can reduce mineral absorption. Leave at least 1 hour between them
4. Treating the supplement as a miracle cure — silicon supports collagen synthesis but does not replace a collagen supplement itself. They complement each other
5. Focusing only on calcium for bone health — calcium, vitamin D, K2, and silicon work together. Isolating one mineral is less effective

Frequently Asked Questions

Is silica supplementation safe?

Yes, silicon is generally safe at recommended doses. Excess orthosilicic acid is excreted by the kidneys. People with kidney problems should consult a doctor. Silicon-containing supplements have been marketed in the EU for decades without significant side effects.

Can I get enough silicon from food?

The European average silicon intake is 20–50 mg per day, but most of it is in poorly absorbable forms. The best food sources are beer (high bioavailability), green beans, whole grains, and mineral water. If you rarely drink beer and eat little whole grain, a supplement may be worthwhile.

How long until I see results?

Skin elasticity improvements have been observed after 20 weeks (Barel et al., 2005). Hair strength improves on a similar timeline. Bone density changes require at least 12 months.

Does silicon help joints?

Direct evidence for joint health is limited, but silicon's role in collagen synthesis suggests indirect support. For joints, collagen and glucosamine supplements are better studied.

What is the best silicon-collagen combination?

Silicon (ch-OSA) + hydrolyzed collagen + vitamin C is a well-supported combination. Silicon supports collagen cross-linking, collagen provides the building material, and vitamin C is needed for both processes.

Estonia-Specific Notes

Estonian pharmacies carry silicon supplements mostly in horsetail extract form (e.g., Equisetum). These are affordable (€5–10 per month) but bioavailability is unstandardized. ch-OSA-based products (e.g., BioSil) are available from online stores at €20–30 per month.

During Estonia's dark winter months, when vitamin D levels drop, silicon is particularly important — without adequate vitamin D, silicon utilization in bones is less effective. Combine a silicon supplement with vitamin D.

References

1. Jugdaohsingh, R., Tucker, K.L., Qiao, N., Cupples, L.A., Kiel, D.P. & Powell, J.J. (2004). Dietary silicon intake is positively associated with bone mineral density in men and premenopausal women of the Framingham Offspring cohort. Journal of Bone and Mineral Research, 19(2), 297–307.
2. Wickett, R.R., Kossmann, E., Barel, A., Demeester, N., Roseeuw, D., Ganev, V. & Calomme, M. (2007). Effect of oral intake of choline-stabilized orthosilicic acid on hair tensile strength and morphology in women with fine hair. Archives of Dermatological Research, 299(10), 499–505.
3. Barel, A., Calomme, M., Timchenko, A., De Paepe, K., Demeester, N., Rogiers, V., Clarys, P. & Vanden Berghe, D. (2005). Effect of oral intake of choline-stabilized orthosilicic acid on skin, nails and hair in women with photodamaged skin. Archives of Dermatological Research, 297(4), 147–153.
4. Carlisle, E.M. (1972). Silicon: an essential element for the chick. Science, 178(4061), 619–621.
5. Reffitt, D.M., Ogston, N., Jugdaohsingh, R., Cheung, H.F., Evans, B.A., Thompson, R.P., Powell, J.J. & Hampson, G.N. (2003). Orthosilicic acid stimulates collagen type 1 synthesis and osteoblastic differentiation in human osteoblast-like cells in vitro. Bone, 32(2), 127–135.
6. Spector, T.D., Calomme, M.R., Anderson, S.H., Clement, G., Bevan, L., Demeester, N., Swaminathan, R., Jugdaohsingh, R., Vanden Berghe, D.A. & Powell, J.J. (2008). Choline-stabilized orthosilicic acid supplementation as an adjunct to calcium/vitamin D3 stimulates markers of bone formation in osteopenic females: a randomized, placebo-controlled trial. BMC Musculoskeletal Disorders, 9, 85.

See also:

• Sulforaphane & Broccoli Extract: A Science-Based Guide for Athletes
• Baobab: The African Superfruit — Complete Guide 2026
• Managing PMS with Supplements: An Evidence-Based Guide

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See also:

• Collagen: Benefits and Dosing
• Calcium and Bone Health After 40
• Biotin: Hair, Skin and Nails