Silicon Dosage: How Much to Take (Evidence-Based)

What Is Silicon and Why Does Dosage Matter?

Silicon (as the biologically active form orthosilicic acid, OSA, or in plant-derived forms such as horsetail extract) is a trace element increasingly studied for its role in bone mineralisation, collagen synthesis, and connective tissue integrity. It is found naturally in foods such as whole grains, bananas, and beer (from barley). Supplements deliver silicon dosage in various forms — choline-stabilised orthosilicic acid (ch-OSA) tends to have higher bioavailability than silica (silicon dioxide) found in some products.

Dosage matters because silicon's physiological roles require a minimum threshold of intake for effect, and the form of silicon determines how much is actually absorbed. Regulatory guidance on silicon supplementation is still evolving, and most safety research comes from dietary exposure data rather than mega-dose supplementation trials.

Studied Effective Dose Ranges

Dietary silicon intake in Western populations has been estimated at approximately 20–50 mg per day, largely from grains and water. Supplementation trials have used a considerably narrower range of bioavailable silicon.

A randomised controlled trial by Spector et al. (2008) used 10 mg per day of ch-OSA (choline-stabilised orthosilicic acid) for 12 months and found significant improvements in bone collagen formation markers compared to placebo in women with osteopenia (Spector et al., 2008). A trial by Barel et al. (2005) used 10 mg per day of ch-OSA for 20 weeks and found improvements in skin and hair characteristics in women with sun-damaged skin (Barel et al., 2005).

These studies establish 10 mg per day of bioavailable silicon (as ch-OSA) as the most consistently effective dose in human clinical trials.

Dose by Goal and Bodyweight

For bone and connective tissue support (the primary evidence area): 10 mg per day of bioavailable silicon (as ch-OSA) is the dose used in the positive RCTs. Bodyweight-based dosing has not been established in the research — trials used flat daily doses. For skin and hair support: the same 10 mg per day of ch-OSA has been used in trials.

For general dietary adequacy (ensuring you meet background intake levels): ensuring adequate whole-grain and plant food consumption is the first step. Supplementation is most relevant when dietary intake is consistently low or specific connective tissue outcomes are the target.

Silicon supplements sold as horsetail extract or silica provide much lower bioavailability than ch-OSA. Check the product label for the form and the amount of elemental silicon or OSA per dose.

Upper Limits and Safety

Silicon has an excellent safety profile from dietary exposure data. The US Institute of Medicine and EFSA have not established formal tolerable upper intake levels for silicon based on the available data, partly because dietary silicon intakes up to approximately 50 mg per day are not associated with adverse effects in population studies.

Supplemental ch-OSA at 10 mg per day — the clinically studied dose — is well within any plausible safety margin. Silicon dioxide (silica) used as a food additive is also considered GRAS (generally recognised as safe) by regulatory agencies.

Very high doses of certain silicon compounds in industrial settings can cause silicosis — a lung disease from inhaled crystalline silica dust — but this is entirely irrelevant to oral supplementation with food-grade or pharmaceutical-grade silicon compounds.

Timing Relative to Meals

Silicon absorption is generally not significantly affected by meal timing. Ch-OSA may be taken with or without food. Some studies administered it with breakfast for consistency. There is no strong evidence that a specific time of day affects outcomes meaningfully.

If you take silicon as part of a multi-ingredient joint or bone formula, follow the label directions for that product.

Practical Protocol

1. Increase dietary silicon intake first: eat more whole grains (oats, whole wheat), bananas, and green beans — all are good silicon sources.
2. If supplementing for bone or connective tissue: look for ch-OSA (choline-stabilised orthosilicic acid) as the silicon form. 10 mg per day of ch-OSA is the dose with the most clinical evidence.
3. Check product labels carefully — total product weight and elemental silicon content differ.
4. For joint and bone support, browse the luud-kohred-sidemed-liigesed category at maxfit.ee where joint support formulas are available.
5. Take with or without food based on convenience; consistency of daily intake matters more than exact timing.
6. Evaluate after at least 3–6 months for bone-related outcomes — silicon trials ran for 12–20 weeks.

FAQ

What is the recommended silicon dosage per day?

Human clinical trials have used 10 mg per day of bioavailable silicon as ch-OSA, which improved bone collagen markers (Spector et al., 2008) and skin and hair characteristics (Barel et al., 2005). This is the most evidence-aligned supplemental dose. Dietary background intake is around 20–50 mg per day from food.

Which form of silicon supplement has the best bioavailability?

Choline-stabilised orthosilicic acid (ch-OSA) has been the most consistently studied form in clinical trials and shows superior bioavailability compared to silicon dioxide (silica) or horsetail-derived silicon. Always check the supplement form on the label.

Is silicon safe to take daily long-term?

At the supplemental doses used in clinical trials (10 mg per day of ch-OSA), daily use for at least 12–20 weeks has been well tolerated in trials. Dietary silicon up to approximately 50 mg per day from food is not associated with adverse effects. No formal upper tolerable intake level has been set for supplemental silicon.

References

Spector, T. D., Calomme, M. R., Anderson, S. H., Clement, G., Beavan, L., Demeester, N., & Van der Auwera, A. (2008). Choline-stabilized orthosilicic acid supplementation as an adjunct to calcium/vitamin D3 stimulates markers of bone formation in osteopenic females. BMC Musculoskeletal Disorders, 9, 85. https://pubmed.ncbi.nlm.nih.gov/18547426/

Barel, A., Calomme, M., Timchenko, A., De Paepe, K., Demeester, N., Rogiers, V., & 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. https://pubmed.ncbi.nlm.nih.gov/16205932/

Nielson, F. H. (2014). Update on the relationship between magnesium and exercise. Magnesium Research, 27(1), 1–7.