Hair growth is a long, patient biology influenced by many factors — genetics, hormones, thyroid function, iron status, medications, stress, diet. This article looks at the diet piece only, and specifically at the general nutrients that appear in dermatology and nutrition literature in the context of healthy hair growth. It is not, and does not attempt to be, a hair-loss solution.
Hair fall can have many drivers — hormonal, thyroid-related, post-illness, genetic, dermatological, or nutritional. Most cases are medical or mixed, not purely nutritional. A doctor or trichologist is the right place to start for anyone actually experiencing hair fall; this article looks only at the general food-nutrition backdrop that dermatology literature commonly references in the context of everyday hair health.
The nutrients commonly named in the hair-nutrition backdrop include essential fatty acids (for the sebum layer that lubricates each strand), vitamin C (used in collagen synthesis), vitamin E (a fat-soluble antioxidant), vitamin A (for scalp health), iron (widely referenced in trichology), zinc (referenced in the hair-growth cycle), and B-vitamins (for cellular metabolism). This is a list of dietary inputs that appear in general nutrition discussions — not a checklist that determines any individual's hair health, which depends on far more than diet.
Sea buckthorn is also one of the higher natural sources of Omega-7 (palmitoleic acid) — a fatty acid referenced in nutrition literature in connection with sebum production and mucosal comfort. Common cooking oils typically contain very little of it. In the context of a balanced overall diet, this is one small food-composition point worth noting; it is not a claim about any specific hair outcome.
The point of this article is only to name the everyday nutrients that appear in hair-nutrition discussions, and to note that sea buckthorn happens to carry several of them. Whether it belongs in any particular diet, and whether it makes any visible difference to any individual's hair, are questions that lie well outside a single food and well inside a proper medical assessment.