Biotin - Strengthen hair and nails. Though there's minimal research to support the effects of biotin on hair growth, there's strong evidence to support a deficiency will cause hair loss. Coconut Oil - Coconut oil promotes the scalp health fighting against such problems as insect bites, lice and dandruff. Coconut oil moisturizes dry hair.  Coconut oil adds luster, shine and softness to the hair Shea Butter - Repairs Damaged Hair. Image: iStock, Prevents Hair Loss. The fatty acids of shea butter condition the scalp and hair, Soothes Dry And Itchy Scalp.