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Silicon for Bones – Benefits & Sources
Silicon is an essential trace element that plays a key role in building and maintaining healthy bones. It supports collagen synthesis and the mineralization of bone tissue.
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Silicon is an essential trace element that plays a key role in building and maintaining healthy bones. It supports collagen synthesis and the mineralization of bone tissue.
What is Silicon?
Silicon (chemical symbol: Si) is the second most abundant element in the Earth's crust and occurs in the human body as orthosilicic acid (Si(OH)₄), the bioavailable form that can be absorbed and utilized by the body. In the body, silicon is found primarily in connective tissue, skin, hair, nails, and especially in bone tissue. As an essential trace element, it is obtained through the diet and supports numerous biological processes.
The Role of Silicon in Bone Health
Silicon is considered an important micronutrient for the formation and maintenance of a healthy bone metabolism. Bone is largely composed of a mineral-collagen composite, and silicon is involved in both components:
- Promotion of collagen synthesis: Silicon is required for the formation of collagen type I, the most important structural protein in bone. It activates specific enzymes (prolyl hydroxylase) that are essential for the stability of the collagen structure.
- Support of bone mineralization: Silicon promotes the incorporation of calcium and phosphate into the bone matrix (hydroxyapatite formation), thereby contributing to bone density and strength.
- Stimulation of osteoblasts: Osteoblasts are the bone-forming cells. Silicon stimulates their activity while simultaneously inhibiting bone-resorbing osteoclasts, resulting in a favorable bone remodeling balance.
- Synergy with other bone nutrients: Silicon works synergistically with calcium, vitamin D, magnesium, and vitamin K2, all of which are required together for optimal bone metabolism.
Scientific Evidence
Early evidence for the importance of silicon in bone health dates back to the 1970s, when Carlisle (1970) and Schwarz and Milne (1972) demonstrated that silicon deficiency in animals leads to bone malformations and reduced bone growth. More recent human studies, including an analysis of the Framingham cohort, show a positive association between dietary silicon intake and bone mineral density in men and premenopausal women. A review published in Nutrition and Metabolism in 2007 confirmed the biological relevance of silicon for bone health.
Dietary Sources of Silicon
Silicon is absorbed primarily through plant-based foods. Good sources include:
- Whole grains (oats, barley, wheat)
- Green beans and other legumes
- Bananas
- Mineral water with a high silica content
- Beer (hops and malt are rich in bioavailable silicon)
Recommended Intake and Supplementation
There is currently no officially established recommended daily allowance (RDA) for silicon. Estimates suggest that adults following a Western diet consume approximately 20–50 mg of silicon per day through food. For individuals with an increased need, such as those at risk of osteoporosis or bone loss, silicon supplements are available. Typical dosages in dietary supplements range from 10 to 30 mg per day, often in the form of orthosilicic acid, colloidal silicon, or bamboo extract (bamboo contains up to 70% silicon dioxide in its dry mass). Overdose is considered unlikely at normal amounts, as excess silicon is excreted by the kidneys.
Risk Groups and Deficiency
Groups at increased risk of silicon deficiency or increased need include:
- Individuals with osteoporosis or an elevated risk of bone fractures
- Older adults, as tissue silicon concentration decreases with age
- Postmenopausal women with declining bone metabolism
- Individuals with a diet poor in whole grains and vegetables
Safety and Interactions
Silicon is considered well-tolerated and safe at the doses commonly used in dietary supplements. Silicon dioxide (SiO₂) used as a food additive (E 551) and soluble silicon in organic form are absorbed differently by the body. No relevant interactions with medications are currently known. However, individuals with kidney disease should consult their physician before supplementing, as silicon is excreted via the kidneys.
References
- Jugdaohsingh, R. et al. (2004): Dietary silicon intake and absorption. The American Journal of Clinical Nutrition, 75(5), 887–893.
- Price, C.T. et al. (2013): Silicon: A Review of Its Potential Role in the Prevention and Treatment of Postmenopausal Osteoporosis. International Journal of Endocrinology, 2013, Article ID 316783.
- Spector, T.D. et al. (2008): Choline-stabilized orthosilicic acid supplementation as an adjunct to Calcium/Vitamin D3 stimulates markers of bone formation in osteopenic females: a randomized, double-blind, placebo-controlled trial. BMC Musculoskeletal Disorders, 9:85.
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