Iron for Nail Strength

Typical dose

Recommended dose

Per lab results: typically 25–65 mg elemental every other day if deficient, with vitamin C.

Expected timeframe

3-6 months

Protocol

form

Ferrous sulfate, fumarate or gluconate matched for elemental iron; alternate-day dosing is better absorbed and tolerated

duration

6 months - fingernails take about 6 months to grow out fully, toenails 12-18 months, so any change appears slowly

co factor

Take on an empty stomach with vitamin C. Evidence is mixed. Koilonychia - spoon-shaped, thin, concave nails - is a classic and genuine sign of chronic iron deficiency, and it resolves with repletion, so the link between severe deficiency and nail structure is real. Brittle, splitting or ridged nails are far less specific: they are usually caused by ageing, repeated wetting and drying, detergents, nail varnish remover and simple mechanical trauma, and only a minority of cases relate to iron. Studies correlating ferritin with brittle nails are inconsistent, and there are no good randomised trials of iron for nail strength. Correct deficiency if present, but expect nails to be a slow and unreliable indicator.

titration

Alternate-day as standard

starting dose

Confirm low ferritin first. Then 40-65 mg elemental iron on alternate days on an empty stomach with vitamin C

What the studies say

Less likely to help if