Why aren’t there more supplements for nails?

While the market abounds in “hair and nails” products, reliable studies on nails are scarce. Benefits to nails from supplements are most often anecdotal or inferred from studies on hair. Preliminary evidence suggests that minoxidil might help with nail growth; vitamin B7 (biotin) might help with brittle nails, triangular worn-down nails, trachyonychia, or habit-tic deformity; and vitamin E might help with yellow nail syndrome and brittle nails. Current evidence suggests that supplementation with calcium, copper, iron, selenium, silica, zinc, vitamin A (retinoids), vitamin B12, or vitamin C doesn’t improve nail health or appearance in non-deficient people.^[1][2]