Silicon is the second most abundant element in the Earth's crust — yet despite its extraordinary prevalence in rocks, soil, and water, its role in human biology remains less well understood than many other trace minerals. Dietary silicon, absorbed primarily as orthosilicic acid from food and water, participates in several important physiological processes: the formation of connective tissue, bone mineralisation, and the structural integrity of skin, hair, and nails. As diets become increasingly rich in processed foods and low in whole grains, vegetables, and legumes, silicon intake has declined across many European populations. Here is a clear picture of what silicon contributes to health and how to approach its dietary and supplementary sources sensibly.
Silicon's Role in the Body
Silicon is found naturally in the human body concentrated in tissues with a high connective tissue content: bone, cartilage, tendons, ligaments, skin, and blood vessel walls. Its biological importance lies primarily in its involvement in the synthesis and stabilisation of structural proteins — particularly collagen, elastin, and hyaluronic acid. These three compounds are the primary building blocks of connective tissue, and adequate silicon availability appears to influence how efficiently the body produces and maintains them.
In bone physiology, silicon plays a role in the early stages of bone matrix formation and mineralisation. Research has demonstrated that silicon is concentrated at sites of active bone calcification, suggesting it participates in the processes by which calcium and phosphorus are incorporated into developing bone. This mechanism is of particular relevance in the context of bone density maintenance and the prevention of age-related bone loss.
Silicon also has a documented role in cardiovascular tissue — specifically in the integrity of arterial walls. The concentration of silicon in arterial tissue is inversely associated with the degree of arterial stiffening seen in atherosclerosis, which has led to research interest in its potential contribution to vascular health. Additionally, silicon has the capacity to bind certain heavy metals and may modulate the neurotoxic effects of aluminium — an area of ongoing scientific interest, though not yet supported by approved health claims in the EU.
Signs of Insufficient Silicon Intake
Because silicon is not routinely measured in clinical blood panels, deficiency is rarely diagnosed formally. The signs most commonly associated with chronically low dietary silicon intake are generally non-specific and overlap with other nutritional insufficiencies:
- Brittle, slow-growing, or excessively thin hair; increased hair loss
- Brittle nails that split, peel, or break easily
- Reduced skin elasticity and early onset of fine lines
- Slower wound healing
- Reduced bone density (a long-term consequence of multiple nutritional factors)
- Fragility of small blood vessels, sometimes visible as thread veins
- Increased susceptibility to infection (indirect, via connective tissue and mucosal integrity)
The primary cause of low silicon intake is a diet dominated by heavily processed foods, refined wheat products, and added sugars — all of which contribute little dietary silicon — at the expense of whole grains, vegetables, and legumes, which are the richest natural sources. Physical stress, sleep deprivation, and advancing age are also associated with increased silicon utilisation and potentially increased requirements.
Food Sources of Silicon
Estimated average dietary silicon intake varies significantly across populations. In European countries, typical intake ranges from 20 to 50 mg per day; in China and India, where diets are built around silicon-rich whole grains and vegetables, intake can reach 140–200 mg per day. The recommended adequate intake for adults is approximately 20–50 mg per day, though this figure is provisional as silicon has no established EU daily reference value.
The richest dietary sources include:
- Whole grains — oats and millet are the most silicon-dense common grains; barley, wheat, and rice also contribute
- Root vegetables and legumes — carrots, beetroot, potatoes, onions, green beans, spinach, soya, lentils, garlic
- Fruit — bananas, pineapple, grapes, mango
- Mineral water — silicon content varies widely; certain naturally silica-rich mineral waters can be a meaningful source
- Herbs — horsetail (Equisetum arvense) is the most concentrated herbal source of silicon and is widely used as the basis for botanical silicon supplements
- Marine plants — algae and seaweed
Bioavailability varies significantly between sources. Silicon in foods exists primarily as polymeric silicic acid, which is less readily absorbed than the monomeric orthosilicic acid form. Cooking and food processing reduce bioavailability further. This gap between dietary silicon content and actual absorption is what has driven interest in more bioavailable supplemental forms.
Silicon and Beauty: Skin, Hair and Nails
The relationship between silicon and the visible signs of healthy connective tissue has made it a popular ingredient in beauty-focused supplements. The mechanism is indirect but well-supported: silicon contributes to collagen synthesis, and collagen is the primary structural protein of skin, hair follicles, and nail beds. Adequate silicon availability supports the density and quality of the collagen matrix that gives skin its firmness, hair its strength, and nails their resilience.
Hair follicles are surrounded by dense connective tissue and are directly dependent on the extracellular matrix for their structural support. Silicon's role in maintaining this matrix means that nutritional silicon status can influence the rate of hair loss, hair shaft diameter, and hair surface quality. Similarly, nail plate formation depends on the structural proteins that silicon helps synthesise — which is why silicon appears consistently in formulations targeting nail strength and brittleness. For comprehensive hair, skin, and nail supplementation, our hair, skin and nails collection includes silicon-based options alongside biotin, collagen, and other relevant nutrients.
Forms of Silicon Supplementation
The form of silicon used in supplements significantly affects how well it is absorbed. The key distinction is between:
- Organic silicon (orthosilicic acid, MMST) — monomethylsilanetriol (MMST) and related orthosilicic acid forms are the most bioavailable silicon compounds. These are water-soluble, stable, and absorbed directly in the small intestine. Liquid preparations in this form have the highest bioavailability.
- Silicon from bamboo shoots or horsetail extract — plant-based silicon sources with reasonable bioavailability and a good safety profile. Commonly found in capsules. Bamboo shoots provide one of the highest plant-source silicon concentrations available.
- Silica (silicon dioxide) — the mineral form, less bioavailable than organic silicon compounds but widely used as a food supplement ingredient.
Liquid organic silicon preparations — particularly those combining silicon with boron and iodine — are popular for their ease of dosing and high bioavailability. They can be diluted in water, juice, or other liquids. Boron supports vitamin D metabolism, calcium utilisation, and hormonal balance; iodine is essential for thyroid hormone production and metabolic regulation — making combination formulas of practical interest for people seeking comprehensive trace mineral support.
[tip:Liquid silicon supplements with MMST or orthosilicic acid form are typically better absorbed than capsule silica. If using a liquid formula, take it diluted in a glass of water or diluted fruit juice — this further improves distribution and absorption. Avoid taking silicon supplements alongside very high-fibre meals, which can bind silicon and reduce uptake.]Silicon Supplements at Medpak
We carry silicon supplements in liquid organic form, plant-extract capsules, and combination formulas:
[products:aura-herbals-silidrop-organic-silicon-mmst-liquid-500-ml, aura-herbals-silidrop-organic-silicon-boron-liquid-500-ml, invex-remedies-silor-b-silicon-with-boron-liquid-500-ml, invex-remedies-silor-b-j-silicon-with-boron-and-iodine-liquid-500-ml, aliness-organic-silicon-from-bamboo-shoots-500-mg-100-veg-capsules, vitalers-organic-silicon-150-mg-60-capsules] [products:formeds-bicaps-silica-60-capsules, solgar-oceanic-silica-25-mg-100-veg-capsules, now-foods-bamboo-silica-beauty-90-capsules, skoczylas-silicon-boron-iodine-horsetail-bamboo-algae-60-capsules, pharmovit-organic-silicon-from-bamboo-shoots-60-capsules, yango-horsetail-extract-90-capsules]Silicon, Collagen, and Bone Health — A Broader Picture
Silicon does not act in isolation. It functions as part of a broader matrix of nutrients required for connective tissue and bone health. Vitamin C is required for collagen cross-linking; magnesium and zinc support the enzymatic processes involved in collagen synthesis; calcium and vitamin D are the primary determinants of bone mineral density; and collagen itself provides the structural scaffold into which minerals are deposited. For those looking to support bone and joint health comprehensively, our bone, joint and cartilage collection includes glucosamine, chondroitin, and collagen formulas, while our dedicated collagen collection provides hydrolysed collagen options for skin and connective tissue support.
[warning:Silicon supplements are generally well tolerated at normal dietary and supplemental doses. Very high silicon intake over prolonged periods has not been studied extensively in humans; stay within the manufacturer's recommended dose. People with kidney disease should consult a doctor before supplementing, as impaired kidney function affects trace mineral excretion. Silicon supplements containing iodine are not suitable for people with thyroid conditions or those on thyroid medication without medical supervision.] [note:All products at Medpak are shipped from within the EU, ensuring fast delivery and no customs complications for customers across Europe.]
