Compounded bioidentical hormones cannot be patented because their molecular structure is the same as they occur in nature. There are several exceptions where bioidentical hormones are used in patented pharmaceuticals (., Prometrium, Estrace) because they have a novel delivery system or some quality that made them unique and ‘patentable’. Unfortunately, these medicines can contain additives, preservatives, dyes and other potential allergens, which make them an unacceptable option for many people. They are also only available in certain doses. Compounded bioidentical hormones are free of undesirable chemicals and doses can be tailored for each individual. In addition, compounded hormones are available in many forms – oral, sublingual, topical, vaginal – whichever works best for each patient.