Biotin

Biotin, commonly known as vitamin B7, coenzyme R, and vitamin H, is a B-complex vitamin. It encourages healthy cell growth and assists in the digestion of protein-building amino acids, which are required for nail growth. Biotin-rich meals and supplements may assist in the strengthening of brittle fingernails. A few modest studies suggest the use of biotin supplements in this regard. In one research of 35 persons with brittle fingernails, 2.5 mg of biotin daily for six to seven months reduced symptoms in 63% of the subjects.

Biotin deficiency is uncommon, and while there is no RDA for biotin, the Adequate Intake (AI) level for adults has been set at 30 mcg per day. Biotin is present in a variety of foods, including egg yolk, dairy products, yeast, salmon, avocado, sweet potato, nuts, seeds, and even cauliflower.