Silicon Benefits: What the Research Shows
Silicon (dietary silicon or orthosilicic acid) is the most abundant mineral element in the Earth's crust after oxygen, yet its status as an essential human micronutrient is still debated. Despite this uncertainty, research published over the past two decades has produced a growing body of evidence connecting silicon intake to connective tissue quality, bone metabolism and skin health. Understanding where this evidence is solid and where it is speculative is important before investing in supplementation.
Primary Evidenced Benefits
Bone Mineral Density
Silicon appears to play a role in bone formation by stimulating osteoblast activity and collagen synthesis in bone matrix. A prospective analysis by Jugdaohsingh et al. (2004) using data from the Framingham Offspring Study found that higher dietary silicon intake was positively correlated with higher bone mineral density in men and premenopausal women, independent of calcium intake (Jugdaohsingh et al., 2004). This correlation does not establish causality, but it provides a biologically coherent signal worth investigating further, particularly as bone metabolism is known to depend on a network of micronutrients beyond just calcium and vitamin D.
Connective Tissue and Collagen Cross-Linking
Orthosilicic acid — the bioavailable form of silicon — has been shown in cell culture studies to upregulate type I collagen synthesis in fibroblasts and osteoblasts. Silicon acts as a co-factor in the hydroxylation of proline and lysine residues during collagen maturation. This mechanistic link to collagen formation underlies most claims about silicon supporting skin, hair, nail and joint health. A double-blind, placebo-controlled trial by Barel et al. (2005) found that supplementation with choline-stabilised orthosilicic acid was associated with improvements in hair tensile strength and skin surface structure in women with fine hair over a 20-week period (Barel et al., 2005).
Secondary and Emerging Effects
Hair and Nail Health
Following from its role in collagen synthesis, silicon supplementation has been studied for effects on hair and nail quality. The evidence here is modest but consistent: improvements in hair thickness and nail brittleness have been reported in several small clinical studies. The effect sizes are generally moderate, and results tend to emerge after sustained supplementation over multiple weeks.
Aluminium Excretion
There is a body of literature suggesting that dietary silicon may reduce gastrointestinal absorption of aluminium and promote its excretion. The relevance of this to everyday supplementation decisions in people without specific aluminium exposure is uncertain.
Where Evidence Is Weak
Claims that silicon reverses osteoporosis, regrows hair lost through androgenetic alopecia, or provides significant anti-ageing effects on skin are not supported by current clinical evidence. Silicon is a supportive micronutrient, not a corrective agent for established disease. Most human studies on silicon are small, short in duration and use surrogate endpoints rather than clinical outcomes.
Who Gains Most
- Older adults, especially postmenopausal women, where bone mineral density decline is clinically significant
- People with fine or brittle hair and nails who have otherwise optimised their diet
- Athletes and active individuals where connective tissue stress and turnover are elevated
- Those in low-dietary-silicon environments, including people whose diets are low in whole grains, root vegetables and mineral water — common in highly processed dietary patterns
Realistic Expectations
Silicon is not a dramatic supplement. Its primary value is as part of a micronutrient foundation that supports connective tissue maintenance over the long term. Products at maxfit.ee that combine connective tissue support, such as MST Chondroitin Glucosamine MSM + HA 90tabs and ICONFIT Capsules Joint N90, address overlapping aspects of joint and collagen health.
For a broader connective tissue support approach, see our bone, cartilage and ligament supplements.
FAQ
What is the difference between silicon the element and silicone?
Silicon is a natural trace mineral found in foods and mineral water; orthosilicic acid is its bioavailable dietary form. Silicone is a synthetic polymer used industrially. They are not interchangeable, and dietary silicon supplementation has nothing to do with synthetic silicone.
What foods are highest in silicon?
Whole grains (particularly oats and barley), root vegetables, certain mineral waters and beer are among the highest dietary sources. Processing strips much of the silicon from refined grains.
How long does silicon supplementation need to be taken to see effects?
Most trials showing beneficial effects on hair, nails or bone biomarkers use supplementation periods of 12 to 20 weeks. Shorter trials have produced inconsistent results. Silicon is not a quick-acting supplement.
References
Jugdaohsingh, R., et al. (2004). Dietary silicon intake and absorption. The American Journal of Clinical Nutrition, 75(5), 887-893.
Barel, A., et al. (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/
Martin, K. R. (2007). The chemistry of silica and its potential health benefits. Journal of Nutrition, Health and Aging, 11(2), 94-97. https://pubmed.ncbi.nlm.nih.gov/17435951/
