Often the more common herbs that are added to food get overlooked for their healthful benefits. Take basil for instance. This is a very popular herb used to flavor foods, but its also been linked to stimulating hair growth and since its naturally anti-inflammatory, its also great to add basil infused oil into healing salves and "boo boo" creams.
This herb is food grade, so it can be used in either beauty care recipes, or used internally in cooking, etc. If you wish to extract the benefits into your beauty care recipe, simply steep this herb in either oil or water, very much like you would a tea ... once it has "released" then strain and use the retained portion inside your formulations.