10. Halibut

White halibut, which can be purchased frozen or fresh, is one of the best sources of biotin, regardless of how you cook it.
A serving of 30-50 grams of halibut (depending on the quality of the fish) contains an impressive 10.2 mcg of biotin, which means that a 100g serving of halibut will provide you with the recommended daily intake of biotin, as well as a hefty amount of Omega-3 fatty acids and magnesium. These ingredients further serve to strengthen your hair and nails, ensuring that they remain healthy regardless of your age.