Si4+.
Research-backed compound with potential health benefits. Silicon in +4 oxidation state. How chemists write silicon ions.
Reviewed March 2026
- Category
- Compound
What Si4+ is, and what it does.
- Does it work
- Promising for bone and skin, but not conclusive.
- How much to take
- Start with 5 to 10mg of silicon a day. 25mg turns up as a research condition. Liquids need a stabiliser because the absorbable monomer condenses above about two millimolar.
- Time to feel it
- Blood silicon rises within hours of a dose. The changes people look for in hair, nail and skin are grown out over three to six months.
- The first dose
- A dose absorbs and clears through the kidneys the same day. Day one shows up as a rise in plasma silicon, not as anything you sense.
- With regular use
- Weeks and months of daily intake keep plasma silicon topped up, since none is stored. Connective tissue and nail measures are where studies looked for change.
- How well tolerated
- Well tolerated at supplement intakes and cleared by the kidney within hours. If you have reduced kidney function, check with your doctor before adding it.
- How it feels
- Nothing you sense day to day. It reads on a blood measure within hours and in nail and hair condition over months.
- The overlooked benefit
- Silicic acid binds aluminium in solution to form hydroxyaluminosilicate species, which is why silicon-rich waters are studied in the context of everyday aluminium handling.
5 to 10mg a day is where Si4+ works.
Source: Proprietary silicon compound. Doses aligned with silicon supplementation research.
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.
Si4+ is documented in the library; the clinical read is in the queue. Nothing about the strength of the research prints until the read is done.
- hair and nail strengthRandomised trial
- skin surface condition and elasticityRandomised trial
- bone mineral density association with dietary siliconCohort study
- collagen cross-linking in connective tissueAnimal study
- absorption of silicon as orthosilicic acidRandomised trial
Questions people ask about Si4+.
- 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.
Silicon and boron appear together in bone and connective tissue formulations because each has been linked to mineral handling in separate work. The pairing is formulation convention supported by separate mechanistic literature on each element, not by a combination trial. Neither substitutes for calcium or vitamin D in that setting.
Collagen cannot be hydroxylated and cross-linked without ascorbate, because prolyl and lysyl hydroxylases need it to keep their iron centre reduced. That is settled biochemistry. Silicon is present in connective tissue and has been associated with collagen cross-linking, so ascorbate covers the step that is definitely rate-limiting while silicon supplies an element found in the same matrix.
Cross-linking of collagen and elastin runs through lysyl oxidase, which carries a copper cofactor at its active site. Without copper the cross-link chemistry does not proceed. Pairing copper with a silicon source addresses a confirmed cofactor requirement in the same tissue compartment.
Glycosaminoglycan assembly depends on manganese-requiring glycosyltransferases. That places manganese upstream of the same extracellular matrix where silicon is found. The cofactor relationship is textbook and needs no trial.
Collagen peptides deliver amino acids and di- and tripeptides used in matrix protein synthesis, while silicon is an element found in that matrix. Co-formulation is common in connective tissue products. The pairing rests on the two acting at different points of the same structure, not on a measured combination effect.
Orthosilicic acid polymerises to insoluble silica once concentrated, which is the central formulation problem for any silicon supplement. Choline is used in a documented stabilised complex that holds the monomeric form in solution until dilution. The relationship is a formulation chemistry fact rather than a nutritional interaction.
Vitamin D drives intestinal calcium uptake through calcium-binding protein expression, a well-established step in mineral handling. Silicon sits on the matrix side rather than the mineral side. Products combine them because the two address different halves of bone tissue, not because a combination has been measured.
Vitamin K2 is the cofactor for the gamma-carboxylation that lets osteocalcin and matrix Gla protein bind calcium. That is settled vitamin K biochemistry. In a bone formulation it operates on the mineral-binding step while silicon relates to the organic matrix.
Roughly half of body magnesium sits in bone, and alkaline phosphatase, central to mineralisation, requires magnesium. The relationship to bone tissue is textbook. It runs parallel to silicon rather than through it.
Hydroxyapatite crystal deposition on collagen fibrils is the mineralisation step, and calcium supplies the mineral. Silicon has been found concentrated at sites of active mineralisation in animal work, which is an association rather than a demonstrated causal role. The two occupy different positions in the same tissue.
MSM contributes bioavailable sulfur, and sulfate groups are a defining feature of the glycosaminoglycans in connective tissue matrix. Silicon is found in that same matrix. The two are combined on that shared-compartment logic rather than on a combination trial.
Hyaluronan is the non-sulfated glycosaminoglycan backbone of extracellular ground substance, the compartment where tissue silicon is measured. Oral hyaluronan is largely depolymerised by gut bacteria before absorption, so what reaches tissue is fragments and monosaccharide. The pairing is compositional rather than mechanistically linked.
Collagen carries an unusually high proline content, and post-translational hydroxylation of those residues stabilises the triple helix. Supplying proline addresses the substrate side of that reaction. It is complementary to silicon, which relates to the assembled matrix rather than to helix formation.
Several enzymes that process procollagen and remodel matrix are zinc metalloenzymes. That cofactor requirement is settled. It sits alongside silicon in connective tissue formulations without either altering the other's absorption.
Bentonite clay is itself an aluminosilicate mineral with high adsorptive surface area. Taken together with a soluble silicon source, it changes the luminal environment and can adsorb dissolved species non-selectively. Spacing an adsorbent clay away from any mineral or vitamin dose is standard formulation practice.
Nothing specific on file for Si4+. 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 Si4+ actually does.
Silicon is absorbed from the gut as orthosilicic acid, Si(OH)4, an uncharged and water-soluble monomer that crosses the intestinal wall by passive diffusion; polymerised or particulate silica is poorly absorbed.
Above roughly two millimolar, orthosilicic acid self-condenses into oligomers and then into insoluble polysilicic acid, which is why concentrated silicon liquids need a stabiliser to keep the absorbable monomer in solution.
Absorbed silicon circulates largely unbound as orthosilicic acid and is cleared by the kidney, so plasma concentrations rise and fall within hours of an oral dose rather than accumulating.
Dietary silicon intake comes mainly from cereal grains, beer and drinking water rather than from animal foods, because plant tissues take up silicic acid from soil while animal tissues concentrate very little of it.
Where Si4+ comes from.
It starts as sand or a silicate rock, gets dissolved into a soluble form, then converted into the small dissolved molecule the gut can take up. Because that molecule clumps back together easily, makers either keep it very dilute or add something to hold it apart. Plant versions come from bamboo or horsetail and carry a different, more clumped kind of silica.
From a mineral source, then refined and usually bound to a carrier so the body can take it up.
Silicon for supplement use starts from silicon dioxide in sand or from a silicate ore; plant-sourced routes start from silica-accumulating plants such as bamboo or horsetail.
Silica is dissolved with sodium hydroxide or fused with sodium carbonate to give sodium silicate, the soluble intermediate for almost every downstream form.
Sodium silicate is passed over cation exchange resin or acidified to liberate orthosilicic acid, with removal of the sodium and any metal impurities carried from the ore.
Because free orthosilicic acid condenses rapidly, it is either diluted below its condensation threshold or complexed with a stabiliser such as choline, and the declared value is elemental silicon.
The stabilised solution is filled as a drop concentrate or gel; powdered products instead carry polymerised silica or a plant silica extract.
Getting Si4+ 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.
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.