Silica (Orthosilicic Acid).
Hair, skin, nails, bones. The beauty mineral.
Reviewed March 2026
- Category
- Mineral
- Also filed under
- HairNailsSkinBones
What Silica (Orthosilicic Acid) is, and what it does.
- Does it work
- Suits people who want the mineral that sits in connective tissue and are happy with a slow, visible-over-months routine. Four records were retrieved, so the human record is small.
- How much to take
- Start with 5 to 10mg of silicon a day. 25mg is a research condition. What matters as much as the number is how much of the form dissolves to orthosilicic acid.
- Time to feel it
- Circulating silicon moves within hours of a dose. The nail and hair changes people are watching for take three to six months to grow out.
- The first dose
- Quiet on the stomach and absorbed within the hour. Day one registers as a rise in plasma silicon that the kidney clears again before bedtime.
- With regular use
- Most effects take 2-8 weeks. Be patient.
- How well tolerated
- Generally well tolerated. Check with your doctor if on medications.
- How it feels
- Not a sensation. It reads on a blood measure the same day and in nail and hair condition across months of steady intake.
- The overlooked benefit
- No reference body has set a requirement for silicon, so it is an ultratrace element rather than an essential nutrient. Interest comes from where it sits in tissue.
5 to 10mg a day is where Silica (Orthosilicic Acid) works.
Source: Barel et al., 2005; Wickett et al., Arch Dermatol Res, 2007
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
Based on 15 human trials with 60% consistency.
- hair and nail strengthRandomised trial
- skin elasticityRandomised trial
- bone mineral density association with dietary siliconCohort study
- silicon absorption as orthosilicic acidRandomised trial
- aluminium complexation at neutral pHIn vitro study
Questions people ask about Silica (Orthosilicic Acid).
- When should I take it?
- Timing matters less than consistency. Pick a time that works for you and take it daily.
- Can I take it with other supplements?
- Usually fine. The main thing to watch is not doubling up on the same ingredient from different products. If you're on prescription meds, check with your pharmacist first.
- Any side effects to watch for?
- Most people tolerate it well at recommended doses. GI upset is the most common complaint with any supplement. Start with a lower dose and work up. If something feels off, stop and reassess.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Ascorbate is the required cofactor of prolyl and lysyl hydroxylase in collagen synthesis, and silicon is associated with the initiation of collagen and glycosaminoglycan formation. Neither substitutes for the other in that sequence.
Collagen peptides deliver the glycine and proline the body reuses for new collagen while silicon is associated with crosslinking and glycosaminoglycan formation. Connective tissue formulas combine the two on that division.
Copper is the metal centre of lysyl oxidase, which crosslinks collagen and elastin fibres after they are laid down. Silicon is associated with the formation end of that same process.
Manganese is the cofactor for glycosyltransferases that build glycosaminoglycan chains, and silicon is associated with the formation of those same matrix components. Connective tissue blends carry both as upstream and enzymatic inputs.
MSM feeds the sulfur pool used for keratin disulfide bonds and for sulfating glycosaminoglycans, and silicon is associated with forming those same matrix components. The two supply different chemistry to one structure.
Silicon is studied as an adjunct to calcium and vitamin D rather than as a substitute for either, and the trial designs reflect that. The endpoints reported are turnover markers, which are markers and not fracture outcomes. The pairing describes how silicon has actually been given to people.
Vitamin D3 governs intestinal calcium absorption while silicon is associated with the connective-tissue side of bone matrix. Trials of orthosilicic acid have used a calcium and vitamin D3 base rather than testing silicon alone. What was measured were bone turnover markers, not structural endpoints.
Vitamin K2 carboxylates osteocalcin so that it binds calcium in bone matrix, a step separate from the collagen side that silicon is linked to. Products combining silicon with D3 and K2 exist and have been described in the literature. The combination is a formulation logic supported by separate mechanisms rather than by a head-to-head trial of the pairing.
Silicon and boron appear together in reviews of ultratrace elements relevant to normal bone and mineral handling, and both influence calcium and magnesium economy indirectly. Neither has an established requirement figure. The pairing is review-level and mechanistic, not a tested combination.
Magnesium status affects how calcium is handled, so a silicon product framed around normal bone maintenance sits on a magnesium-adequate background. The two act on different parts of the same tissue, silicon on the collagenous matrix and magnesium on the mineral phase and its regulation. This is background physiology rather than a demonstrated interaction.
Collagen synthesis needs proline as substrate and vitamin C as the cofactor for prolyl hydroxylase, and silicon is associated with the same matrix. Supplying proline supports the amino acid side of that pathway. Silicon has no role in the hydroxylation chemistry itself, so this is complementary rather than causal.
Every third residue of a collagen chain is glycine, so glycine availability is a substrate condition for collagen assembly. Silicon is associated with connective tissue quality rather than with the assembly step. The pairing is substrate plus matrix-associated mineral, not two agents doing the same job.
Collagen strength comes from covalent cross-links formed at lysine and hydroxylysine residues, a step that needs copper-dependent lysyl oxidase. Lysine supplies the residue and silicon is associated with the matrix those fibres build. It is a supply relationship, not a demonstrated combined effect.
Zinc is a cofactor across matrix metalloproteinases and in keratin protein synthesis, which is why it appears next to silicon in nail and hair formulas. Silicon is associated with the connective tissue side of the same structures. Reviews of nail supplements describe both together without testing them separately.
Biotin and silicon appear together in nail and hair products, and the reviews that cover this category discuss both. Biotin acts as a carboxylase cofactor and silicon is associated with connective tissue, so the two do not share a pathway. The pairing is convention with separate mechanisms behind each part.
Silicon has been reported in association with glycosaminoglycan-containing connective tissue and hyaluronic acid is itself a glycosaminoglycan. Products aimed at skin hydration and matrix support commonly carry both. The link is a shared tissue compartment rather than a shown combined effect.
Silicic acid polymerises and complexes with polyvalent metal ions at neutral pH, which can reduce how much soluble silicon remains available for absorption when a concentrated mineral dose is taken at the same time. Separating a high-dose iron supplement from a silicon dose avoids the question. The interaction is a solution chemistry issue, not a demonstrated clinical loss.
Strontium is incorporated into the mineral phase of bone in place of calcium, while silicon is associated with the collagenous matrix that phase is deposited on. The two touch different halves of the same tissue. There is no combination trial, so this stays mechanistic.
Nothing specific on file for Silica (Orthosilicic Acid). Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Silica (Orthosilicic Acid) actually does.
Orthosilicic acid, Si(OH)4, is the only form of silicon absorbed to a meaningful extent from the gut; polymeric and colloidal silica must first depolymerise to the monomer to be taken up.
Absorbed silicon circulates largely unbound as orthosilicic acid and is cleared rapidly by the kidney, so plasma concentrations track recent intake rather than body stores.
Orthosilicic acid polymerises to silica gel above roughly two millimoles per litre in aqueous solution, which is why concentrated silicon preparations use a stabiliser such as choline to hold the monomer in solution.
Silicon is concentrated in connective tissues rich in glycosaminoglycans, including aorta, trachea, skin, bone and nail.
Where Silica (Orthosilicic Acid) comes from.
All silicon supplements have to end up as the same small molecule, orthosilicic acid, before the body can take any of it up. Some products supply that molecule directly in a stabilised liquid, some supply silica powder from sand or from bamboo and rely on a small part of it dissolving, and some of it just comes from water. That is the difference between the formats, and the milligram number on the front does not tell you which you have.
The same molecule is reached more than one way. Which route a given product used is a manufacturing choice, and the finished compound is the same either way.
Mineral routes start from high-purity quartz or from soluble silicates; botanical routes start from bamboo shoot and leaf or from horsetail herb, both of which concentrate silicon as phytoliths.
Mineral silica is fused or digested with sodium carbonate or sodium hydroxide to give water-soluble sodium silicate, the common intermediate for most silicon chemistry.
Sodium silicate is acidified under controlled dilution to liberate monomeric orthosilicic acid, which polymerises within minutes unless it is stabilised or kept very dilute.
Choline chloride or a comparable stabiliser is added to hold the orthosilicic acid as the monomer at a usable concentration, giving the ch-OSA liquid concentrate.
Bamboo or horsetail biomass is extracted and the silica-rich fraction is concentrated, then standardised to a declared silicon dioxide percentage, typically 70 percent or higher.
Sodium salts from the acidification step and plant residues from the botanical route are washed out, and heavy metal limits are checked because both mineral and plant feedstocks can carry them.
The material ships as a stabilised acidic liquid, a standardised botanical powder, or a fumed and precipitated silicon dioxide powder used both as an active and as a flow aid.
Getting Silica (Orthosilicic Acid) from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
The essence, in one line each.
- The umbrella review finds that animal evidence for silicon and bone is substantially stronger and more consistent than the human evidence, and that translation from animal models to human bone outcomes is not yet established.Systematic review. Pritchard et al., 2024 (Nutrients). PMID 38337624 ↗
- A pilot double-blind crossover comparison of dietary supplement formulations reports that relative silicon absorption differs by formulation, measured as serum and urinary silicon.Randomised trial. Boqué et al., 2021 (Scientific Reports). PMID 34389753 ↗
- Over twelve weeks of silicon-rich artesian aquifer water intake, the authors report changes in bone turnover markers; these are markers of bone metabolism and not fracture or structural outcomes.Open-label trial. Li et al., 2010 (Nutrition Journal). PMID 20946656 ↗
- The review positions silicon alongside lithium and boron as ultratrace elements with mechanistic roles in mineral and metabolic regulation, and notes that no dietary requirement has been established for silicon.Narrative review. Melenikioti et al., 2026 (Nutrients). PMID 41683210 ↗
- Hair silicon is proposed as a long-term exposure marker and is reported to differ across the groups compared; this is an association with a measured marker and not evidence that silicon intake causes a change in vascular outcomes.Cohort study. Dziedzic et al., 2025 (Nutrients). PMID 41470901 ↗
- The report describes an oral supplement combining bio-activated silicon with vitamins D3 and K2 used alongside standard conservative care in adults with reduced bone density; silicon is one component of a multi-ingredient product and the design does not isolate its contribution.Open-label trial. Gazzeri et al., 2026 (Journal of Clinical Medicine). PMID 42452665 ↗
- The review of nail supplements names silicon among the ingredients commonly included and notes that evidence for individual components is limited and largely from small studies.Narrative review. Zaraa et al., 2025 (Skin Appendage Disorders). PMID 40176998 ↗
These are the studies our verdict leans on, chosen from the 7 we read for Silica (Orthosilicic Acid). The full linked list is below.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.