Protocol · Skin, Hair & Nails
Nail Health Support Protocol
Biotin and Collagen Peptides are the core of this stack, with 6 supporting supplements. Each row gives the amount the protocol lists and the grade our evidence database holds for that supplement in Nail Health Support.
We are re-verifying the studies cited on protocol pages; only confirmed citations are shown.
The stack
8 supplements · none graded yet · 2 confirmed studies
| Grade | Supplement | Amount listed | Why it’s in the stack | Evidence on file | Shop |
|---|---|---|---|---|---|
| Primary stackThe core of this protocol | |||||
| Biotin | Amount listed: 2,500–5,000 mcg (2.5–5 mg) daily | B vitamin essential for keratin production; best-studied supplement for brittle nails | Not graded yet | ||
Confirmed studies for Biotin (titles as PubMed lists them) | |||||
| Collagen Peptides | Amount listed: 5–10 g daily | Provides amino acids for nail matrix; studies show improved nail growth and strength | Not graded yet | ||
Confirmed studies for Collagen Peptides (titles as PubMed lists them) | |||||
| Supporting stackListed as additions to the core | |||||
| Iron | Amount listed: Only if deficient: 30–60 mg elemental iron daily | Deficiency causes brittle, spoon-shaped nails (koilonychia); correct if deficient | Not graded yet | ||
| Zinc | Amount listed: 15–30 mg daily | Essential for keratin synthesis; deficiency causes white spots and nail dystrophy | Not graded yet | ||
| Silica/Silicon | Amount listed: 10–30 mg daily (as orthosilicic acid) | Component of connective tissue; may support nail structure and strength | Not graded yet | ||
| Vitamin B12 | Amount listed: 1,000 mcg daily if deficient or at risk | Deficiency can cause nail discoloration and changes; supports cell division | Not graded yet | ||
| Omega-3 Fatty Acids | Amount listed: 1–2 g EPA+DHA daily | Supports nail bed hydration and reduces brittleness | Not graded yet | ||
| Vitamin E | Amount listed: 200–400 IU daily; topical oil for nails | Antioxidant that supports nail health; topical application may help yellow nail syndrome | Not graded yet | ||
Shop the evidence-backed picks
The collection holds the supplements we grade A or B for its theme, in third-party tested products where the catalog has them. It opens in our Fullscript store. You can look through it without signing in; Fullscript asks for a free account to order.
Or shop one supplement
Each opens third-party tested products, matched to the dose above where we can.
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How this protocol works
In plain language
Healthy nails grow about 3-4mm per month and reflect overall health. Common nail problems include brittleness (cracking, splitting, peeling), slow growth, white spots, ridges, discoloration, and fungal infections. Nail changes can signal nutritional deficiencies (iron, zinc, biotin) or health conditions (thyroid problems, psoriasis, fungal infection). Aging, frequent water exposure, nail polish removers, and harsh chemicals also damage nails.
CRITICAL: Some nail changes indicate health problems that need medical evaluation. See a doctor for: sudden changes in nail color or shape, nails separating from the nail bed, dark streaks (could be melanoma), painful or swollen nail folds (infection), persistent nail thickening or crumbling (fungal infection), nails that curve around fingertips (clubbing - can indicate lung/heart disease), or nail changes with skin rashes (psoriasis). These supplements support nail health but won't fix fungal infections (need antifungals) or underlying medical conditions.
Biotin* has the most evidence for brittle nails. Studies show 2.5-5mg daily can increase nail thickness by 25% and reduce splitting after 6-12 months of use.
Collagen Peptides* provide the amino acids (glycine, proline) used to build nail protein. Clinical trials show improved nail growth rate and reduced brittleness.
Iron* deficiency causes characteristic spoon-shaped nails (koilonychia) and brittleness. Only supplement if blood tests show deficiency.
Zinc* is essential for keratin production. White spots on nails may indicate zinc deficiency.
Silica/Silicon* is a component of connective tissue and may support nail structure.
Vitamin B12* deficiency can cause bluish discoloration and other nail changes.
Omega-3 Fatty Acids* support nail bed hydration.
Vitamin E* has antioxidant effects; topical application may help some nail conditions.
Expected timeline: Nails grow slowly - it takes 6 months for a fingernail to completely regrow, 12-18 months for toenails. Allow at least 3-6 months to see supplement benefits.