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Silica Side Effects & Safety

Evidence:Emerging
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Generally very well-tolerated
  • Mild digestive discomfort (rare)
  • Long-term high-dose silica from horsetail extract may contain thiaminase (destroys vitamin B1)
  • Kidney stones theoretically possible with very high chronic silica intake, though not documented at supplement doses

Drug & Supplement Interactions

  • Horsetail extract may have diuretic effects — caution with diuretic medications
  • Thiaminase in horsetail may deplete vitamin B1 with chronic use — consider B1 supplementation
  • No significant interactions reported with ch-OSA (BioSil) form

Maximum Dose

Do not exceed: No established UL; doses up to 50mg silicon daily appear safe in studies

Full Silica Guide

References

  1. RCTBarel A, Calomme M, Timchenko 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. DOI PubMed
  2. ObservationalJugdaohsingh R, Tucker KL, Qiao N, Cupples LA, Kiel DP, Powell JJ (2004). Dietary silicon intake is positively associated with bone mineral density in men and premenopausal women of the Framingham Offspring cohort. Journal of Bone and Mineral Research. DOI PubMed
  3. Reffitt DM, Ogston N, Sherwood RA, et al. (2003). Orthosilicic acid stimulates collagen type 1 synthesis and osteoblastic differentiation in human osteoblast-like cells in vitro. Bone. DOI PubMed
  4. Shao J, Wang S, Cheng H, Fu P, et al. (2025). The association between occupational silica exposure and leukemia: a systematic review and meta-analysis of cohort studies.. BMC public health. DOI PubMed
  5. Howlett P, Gan J, Lesosky M, Feary J (2024). Relationship between cumulative silica exposure and silicosis: a systematic review and dose-response meta-analysis.. Thorax. DOI PubMed
  6. Shao J, Fu P, Wang S, Cheng H, et al. (2024). Occupational exposure to silica and risk of gastrointestinal cancers: a systematic review and meta-analysis of cohort studies.. International archives of occupational and environmental health. DOI PubMed
  7. Schlünssen V, Mandrioli D, Pega F, Momen NC, et al. (2023). The prevalences and levels of occupational exposure to dusts and/or fibres (silica, asbestos and coal): A systematic review and meta-analysis from the WHO/ILO Joint Estimates of the Work-related Burden of Disease and Injury.. Environment international. DOI PubMed
Show 4 more references
  1. Zhou Y, Zhang W, Wu D, Fan Y (2023). The effect of silica exposure on the risk of lung cancer: A meta-analysis.. Journal of biochemical and molecular toxicology. DOI PubMed
  2. Book F, Backhaus T (2022). Aquatic ecotoxicity of manufactured silica nanoparticles: A systematic review and meta-analysis.. The Science of the total environment. DOI PubMed
  3. Morotti A, Sollaku I, Franceschini F, Cavazzana I, et al. (2022). Systematic Review and Meta-analysis on the Association of Occupational Exposure to Free Crystalline Silica and Rheumatoid Arthritis.. Clinical reviews in allergy & immunology. DOI PubMed
  4. Ehrlich R, Akugizibwe P, Siegfried N, Rees D (2021). The association between silica exposure, silicosis and tuberculosis: a systematic review and meta-analysis.. BMC public health. DOI PubMed