Is your hair growth in need of a boost? Biotin is often used in hair supplements to help strengthen, thicken, and protect hair. While a biotin supplement isn't the miracle cure for hair loss, it may still help to give you healthier, better-looking locks as well as strengthen your nails. If you want to combat thinning hair, it might be time to consider increasing the amount of biotin in your diet and taking a supplement that contains biotin. You can buy biotin for hair growth online and in store at Evelyn Faye Nutrition.