Most hair vitamins are equipped with large doses of biotin. Biotin is a B vitamin essential to hair growth and good for your scalp. So what foods are rich in biotin? Raspberries, blueberries, and blackberries, are all high in biotin. Not to mention, they’re usually loaded with antioxidants for healthy, glowing skin. So if you have a sweet tooth, have a hand full of berries instead of a candy bar.