What ingredients support healthy nails?
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Common nail-support ingredients include biotin, zinc, MSM, horsetail, collagen and plant oils. Biotin has the best evidence — and mainly for genuinely brittle nails — while the others play supporting or weakly-evidenced roles.
Key takeaways
- Biotin has the most evidence, mainly for brittle nails.
- Protein, iron and zinc adequacy matter for nail strength.
- Most ingredients help by preventing deficiency, not boosting healthy nails.
Biotin: the headline ingredient
Biotin (vitamin B7) is the most-studied nail nutrient, with some evidence that supplementing can improve brittle, splitting nails — though much of this research is older and modest. Crucially, it mainly helps people whose nails are genuinely brittle, and the benefit takes months as nails grow slowly. For someone with already-healthy nails, extra biotin is unlikely to do much. One practical note: high-dose biotin can interfere with certain lab tests, so mention it to your doctor before blood work.The supporting nutrients and compounds
Nails are made of keratin (a protein), so adequate protein, iron and zinc matter — deficiencies in iron or zinc can show up as nail changes, making correction helpful where a gap exists. MSM (a sulphur compound) and horsetail (which supplies silica) are popular for nails and hair, but their human evidence is limited. Collagen has some early evidence for nail growth and reduced brittleness. These are reasonable supporting ingredients with generally modest, sometimes thin, proof.The honest summary
The pattern across nail ingredients is familiar: they help most by correcting a deficiency or supporting genuinely weak nails, not by upgrading healthy ones. If your nails are brittle, ensuring adequate protein, iron, zinc and biotin — ideally after checking for deficiencies — is sensible, alongside protecting nails from harsh chemicals and over-manicuring. Persistent nail changes, though, can signal health issues (thyroid, anaemia, infection), so they’re worth a check rather than assuming a supplement is the answer.Key ingredients to understand
If you’re weighing up a nail & foot care product, these are two of the ingredients worth knowing about — what they may do, and where the evidence stands:
- Biotin — Biotin is the vitamin behind countless hair, skin and nail supplements — but there's little evidence it helps anyone who isn't deficient (and deficiency is rare). It also…
- Collagen (Hydrolysed Peptides) — Collagen peptides are the most popular skin and joint supplement. There is some genuine trial evidence for modest improvements in skin hydration and elasticity, but a lot of it is …
What to check before you buy
Nail-support supplements help nail appearance and hygiene routines but can't cure a fungal infection — that needs antifungal treatment from a clinician. Nails grow slowly, so give any nail nutrient consistent months, not days, and pair it with good foot hygiene.
Frequently asked questions
Which nail ingredient works best?
Biotin has the most evidence, mainly for improving genuinely brittle, splitting nails — and it takes months.
Do MSM and horsetail help nails?
They’re popular but their human evidence is limited; they’re supporting ingredients rather than proven nail-strengtheners.
Can nail changes signal a health problem?
Yes — thyroid issues, anaemia, infections and deficiencies can all show in the nails, so persistent changes are worth checking.
Related on FactoWiki
- Nail & Foot Care supplements — the full category
- Biotin — ingredient guide
- Collagen (Hydrolysed Peptides) — ingredient guide
- Nail Refresh review
- ProNail Complex review
- Compare: kerassentials vs nail refresh
This article is general information, not medical advice. FactoWiki may earn a commission from links on product review pages (never on comparisons). Always check with a qualified healthcare professional about your own situation.