Salmon The key ingredients for a healthy hair and scalp are protein and vitamin D. Salmon is a great source of protein, vitamin D and omega-3 fatty acids. This omega-3 fatty acid is very much essential to keep your scalp and hair shaft very well hydrated. As healthy hair starts with a healthy scalp, get in more omega-3 fatty acids in your diet.Salmon is the common name for several species of ray-finned fish in the family Salmonidae. Other fish in the same family include trout, char, grayling and whitefish. Salmon are native to tributaries of the North Atlantic and Pacific Ocean.