Silicon is essential for collagen synthesis and bone matrix formation — yet most "silica" supplements contain silicon dioxide, which has essentially zero bioavailability. The form you choose is everything with this mineral.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your physician before starting any supplement.
Silicon is the second most abundant element in the Earth's crust — and the third most abundant trace element in the human body. It plays structural roles in connective tissue that are only beginning to be fully understood. Silicon is incorporated into bone matrix, participates in the cross-linking of collagen and glycosaminoglycans (the structural proteins of cartilage, skin, and tendons), and appears to be required for prolyl hydroxylase activity — the same enzyme that Vitamin C activates in collagen synthesis.
The key distinction that most consumers miss: silicon (the mineral element, Si) and silica (silicon dioxide, SiO₂) are different things. Silicon dioxide — the same compound used as an anti-caking agent in powdered supplements and listed as an "inactive ingredient" — is essentially insoluble and has near-zero bioavailability. When you see "silica" on a supplement label, you need to check whether it's in a bioavailable form or just SiO₂ filler.
Further terminology note: silicone (the synthetic polymer used in medical implants and cookware) is entirely different — a manufactured polymer with no relevance to silicon nutrition. Don't let the similar names cause confusion.
Silicon dioxide (SiO₂) — the form listed as "silica" in the majority of mineral supplements — is a polymerised, insoluble mineral with essentially zero oral bioavailability. Your body cannot extract usable silicon from it. A product listing "200mg silica (as silicon dioxide)" is delivering functional silicon about as efficiently as swallowing sand. The only forms your body can actually absorb are soluble orthosilicic acid (Si(OH)₄) and its stabilised derivatives.
Choline-stabilised orthosilicic acid — the gold standard for bioavailable silicon. Stabilising orthosilicic acid with choline prevents polymerisation in the bottle, delivering monomeric Si(OH)₄ that is immediately bioavailable. All human clinical trials on silicon and hair/skin use this form. 10mg silicon/day = 5 drops or 2 capsules of BioSil.
Bamboo (Bambusa vulgaris or Phyllostachys species) has among the highest silicon concentrations in the plant kingdom (up to 70% dry weight as silica in some species). Bamboo extract releases soluble silicic acid during digestion with reasonable bioavailability. A practical middle-ground option if ch-OSA is unavailable or cost-prohibitive.
Equisetum arvense (horsetail) is the traditional herbal source of silica and contains reasonable silicon. However, it also contains thiaminase — an enzyme that destroys thiamine (Vitamin B1). Long-term or high-dose horsetail use risks thiamine deficiency. Only use standardised silica-only extracts with thiaminase removed, not raw horsetail powder.
This form appears in the majority of budget silicon supplements and multivitamins. It is insoluble, passes through the digestive tract unchanged, and provides no meaningful silicon nutrition. It is primarily used as a flow agent and anti-caking agent in powdered supplements — an excipient, not a nutrient. If a supplement lists only "silica" or "silicon dioxide" without specifying a bioavailable form (ch-OSA, orthosilicic acid, bamboo extract), assume it is SiO₂ and discard it.
The majority of silicon research uses ch-OSA specifically — results cannot be extrapolated to other silicon forms. Most trials are relatively small and short-term. Silicon's role in bone health is strongly supported epidemiologically but awaits larger intervention trials. Hair and skin results are the most consistently demonstrated clinical effects with ch-OSA.
Silicon stimulates prolyl hydroxylase — the enzyme that adds hydroxyproline to collagen chains, enabling the cross-links that give collagen its tensile strength. This requires both Vitamin C and silicon as cofactors, making them complementary rather than redundant.
Silicon is concentrated at sites of active bone formation. It is incorporated into the organic bone matrix alongside collagen and promotes osteoblast differentiation. Bone silicon content declines with age, correlating with reduced bone quality and density.
Silicon interacts with glycosaminoglycans (hyaluronic acid, chondroitin, dermatan sulphate) — the structural molecules of skin, cartilage, and tendons. It forms cross-links between polysaccharide chains, contributing to the resilience and water-binding capacity of these tissues.
Results require patience. Silicon acts through collagen and bone matrix remodelling — both slow processes. Wickett's hair study ran for 9 months; Barel's skin study for 20 weeks. Expect 3–6 months of consistent supplementation before evaluating results.
Pair with Vitamin C. Both silicon and Vitamin C are required for prolyl hydroxylase activity. Taking them together maximises the collagen synthesis benefit. See our Vitamin C guide for dosing.
For ch-OSA specifically: Take with or without food. The liquid drop form (BioSil) can be added to water or juice. Capsule forms are more convenient but check they specify "ch-OSA" or "choline-stabilised orthosilicic acid" — not simply "silicon dioxide."
Silicon at dietary and supplemental doses has an excellent safety record. It is readily excreted by the kidneys when intake is adequate. There are no established upper tolerable limits for silicon in healthy adults, reflecting its low toxicity at supplemental doses.
Evidence-based supplement recommendations from a former physical store owner. No hype. No BS. Just facts.
Download Free PDF