swiss chard almonds walnuts cooked eggs all have Biotin and a biotin deficiency is associated with brittle nails , hair loss, and seborrheic dermatitis.
Protein makes ups hair primarily. So an adequate amount of protein is needed daily.
Fish like salmon, tuna, sardines and cod flaxseed and walnuts all are high in Omega 3. Low omega 3'3 cause brittle hair
Spinach, kale, and other leafy greens are rich in beta-carotene, which converts vitamin A
Palmetto a dietary supplement can also help reduce hair loss.