Alpha Monster Advanced Some little known minerals and vitamins that provide essential nutrients for your skin are selenium, L-Carnitine and zinc. L-Carnitine is a supplement that you must take in pill or capsule form. Zinc is something that you can find in many nuts and whole grains, as well as mushrooms and eggs. Many soil-based vegetables also have selenium. Foods grown hydroponically will have a lower selenium content. When consuming a diet that includes a balance of organic foods along with L-Carnitine, you are getting the proper amount of nutrition.