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MineralsWeak evidence

Silicon

Also known as: Si, silica, horsetail

Silicon is a trace element found in grains (especially oats and barley), beer, mineral waters and the horsetail plant. It is involved in connective tissue and bone formation, but its essentiality for humans is not firmly established.

What it is used for

  • hair and nail health – weak evidence, small studies with orthosilicic acid
  • bone strength – weak evidence, mostly observational
  • skin and collagen – weak evidence

Forms and how they differ

field horsetail (extract)

plant source of silicon; content varies, a standardised extract matters

orthosilicic acid (stabilised)

best studied and well absorbed form

silicon dioxide (silica)

poorly absorbed; often just an excipient

When to take it

With food, any time of day; effects on hair and nails are judged after several months.

Pairs well with

Collagen, biotin, zinc, vitamin C.

Do not combine / separate

Horsetail may have a mild diuretic effect – take care when combining with diuretics.

Watch out for

Horsetail products are not suitable in pregnancy, breastfeeding or with kidney disease. If you take medicines (especially diuretics or lithium), consult your doctor.

Safety

EFSA did not set an upper limit for silicon due to insufficient data; do not exceed the label dose.

Practical tip

Oats and whole grains are a natural and cheap source of silicon.

Products containing Silicon 1

Siliconhorsetail extractHair & nailsSkinBonesJoints
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence

Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.

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Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.

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From the same group

Bone support blendModerate evidenceBoronWeak evidenceCalciumModerate evidenceChromiumWeak evidenceCopperWeak evidenceElectrolytesModerate evidence
Important notice

This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.