Silicon
Useful mainly for people seeking connective-tissue, bone, or hair/skin/nail support from a bioavailable form.
Quick decision guide
May help most
people seeking connective-tissue, bone, or hair/skin/nail support from a bioavailable form
Common dosing range
5–20 mg/day (supplements); ~20–50 mg/day from food
When to expect effects
Months
Watch out for
Horsetail-derived silica contains thiaminase and has diuretic effects
What is it
Silicon is the second most abundant element on Earth and is present in small amounts in foods, especially whole grains, beer, and certain vegetables. Although not formally classified as essential for humans, growing evidence supports a beneficial role in connective tissue, bone, hair, and skin.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
bone health Limited Evidence | Small associations with bone density | people with low silicon intake interested in bone support | Months |
hair, skin, and nails Limited Evidence | Small improvements in some trials | people with brittle hair/nails using bioavailable ch-OSA | Months |
collagen synthesis support Limited Evidence | Mechanistic | not established in humans | Unknown |
bone health
- Effect
- Small associations with bone density
- Best fit
- people with low silicon intake interested in bone support
- Time
- Months
hair, skin, and nails
- Effect
- Small improvements in some trials
- Best fit
- people with brittle hair/nails using bioavailable ch-OSA
- Time
- Months
collagen synthesis support
- Effect
- Mechanistic
- Best fit
- not established in humans
- Time
- Unknown
Evidence for 3 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
bone health
Biomarker supportObservational data associate higher dietary silicon with greater bone mineral density, and silicon appears to influence collagen synthesis and bone matrix mineralization. Evidence rests largely on intake-density associations and small trials rather than fracture outcomes. The benefit is a biomarker (bone density) association, not demonstrated fracture prevention.
Bottom line: Linked to better bone density in limited data, but fracture benefit is unproven.
Evidence is mixed
Associations with bone density are suggestive but come from observational data and small trials, not outcome trials.
hair, skin, and nails
Biomarker supportSmall trials of choline-stabilized orthosilicic acid report modest improvements in hair and nail strength and skin measures, consistent with silicon's role in collagen formation. The studies are small and several are industry-linked. Effects are measured on surrogate quality outcomes rather than disease endpoints.
Bottom line: Bioavailable silicon may modestly improve hair, skin, and nail quality, but evidence is limited.
collagen synthesis support
Mechanism onlySilicon appears to help activate prolyl hydroxylase, an enzyme essential for collagen formation, and is concentrated in connective tissues. This provides a mechanistic basis for the hair, skin, nail, and bone claims. Direct clinical proof that supplementation raises functional collagen outcomes is limited.
Bottom line: A plausible collagen-supporting mechanism underlies the connective-tissue claims, but clinical proof is thin.
How it works
How to take it
What to track
4 commercial forms
Compare the main delivery options and what they’re best suited for.
Choline-stabilized orthosilicic acid (ch-OSA)
The form used in most clinical trials, particularly for hair, skin, nails, and bone. Brand examples include BioSil.
Most bioavailable form; mimics naturally occurring OSA in beverages.
Orthosilicic acid (OSA, often in liquid)
Found in some liquid supplements and naturally in beer and mineral waters.
High bioavailability when stabilized.
Horsetail (Equisetum arvense) extract
Traditional botanical source of silica. Long-term use may deplete thiamine and has mild diuretic effects.
Moderate bioavailability; contains other plant compounds.
Silicon dioxide / colloidal silica
Used primarily as a tablet excipient (anti-caking agent), not as a meaningful source of bioavailable silicon.
Poor bioavailability in solid form.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Serious risks
thiamine depletion with long-term high-dose horsetail (thiaminase content)
Who should avoid it
- people on diuretics using horsetail-based products
- people with kidney disease without clinician input
Pregnancy & breastfeeding
Be cautious with horsetail-based silicon in pregnancy; bioavailable orthosilicic acid forms are generally better tolerated, but consult a clinician.
Interactions
Long-term high-dose horsetail can lower thiamine through thiaminase
Horsetail-based silicon may have mild diuretic effects
Protocols featuring Silicon
Evidence-backed routines where Silicon plays a role.
Food sources
| Food | Amount | %DV |
|---|---|---|
| Beer (12 oz) | Up to 14 mg | — |
| Whole grain bread (1 slice) | 3-5 mg | — |
| Brown rice (1 cup, cooked) | 5 mg | — |
| Oats (1 cup, cooked) | 8 mg | — |
| Bananas (1 medium) | 5 mg | — |
| Green beans (1/2 cup, cooked) | 3 mg | — |
| Bottled mineral water (1 cup) | Varies widely (0-40 mg/L) | — |
Beer (12 oz)
- Amount
- Up to 14 mg
- %DV
- —
Whole grain bread (1 slice)
- Amount
- 3-5 mg
- %DV
- —
Brown rice (1 cup, cooked)
- Amount
- 5 mg
- %DV
- —
Oats (1 cup, cooked)
- Amount
- 8 mg
- %DV
- —
Bananas (1 medium)
- Amount
- 5 mg
- %DV
- —
Green beans (1/2 cup, cooked)
- Amount
- 3 mg
- %DV
- —
Bottled mineral water (1 cup)
- Amount
- Varies widely (0-40 mg/L)
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Is silicon the same as silica or silicone?⌄
Silicon is the element. Silica (silicon dioxide) is silicon combined with oxygen. Silicone is a synthetic polymer with silicon in its backbone, used in medical implants and household products. Only orthosilicic acid (a form of silica in water) is well-absorbed by humans.
Will silicon really make my hair and nails stronger?⌄
Small studies of choline-stabilized OSA show modest improvements over several months. The effect is not dramatic, and individual responses vary. Better hair and nail outcomes generally require addressing diet, thyroid status, and iron levels alongside silicon.
What's the best form of silicon?⌄
Choline-stabilized orthosilicic acid (ch-OSA) has the most clinical trial support and highest bioavailability. Liquid OSA is similar. Horsetail provides silicon but with additional plant compounds and concerns at high doses.
Is beer really a good source of silicon?⌄
Yes, surprisingly. Beer contains highly bioavailable silicon from the malted barley and hops. A 12-oz beer can provide 10-14 mg, though this is not a recommendation to drink beer for health.
Is silicon safe long-term?⌄
Orthosilicic acid forms appear safe at typical supplement doses. Long-term high-dose horsetail can deplete thiamine and is best avoided or combined with a B-complex.
References by claim
Track Silicon with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.