Dandruff and hair loss are both conditions associated with a zinc deficiency. Zinc is a mineral that promotes cell reproduction, tissue growth and repair. Zinc also functions in the maintenance of the oil-secreting glands attached to our hair follicles. Good sources of zinc include foods of animal origin, including seafood, poultry, mussels, shrimp and oysters. Eggs and milk also supply zinc but in smaller amounts. Whole-grain products, nuts, seeds and legumes contain zinc, but in a form that is less absorbable by the body.