There are no studies to confirm or deny that the ingredients used in HAIRMETTO, when applied topically, will affect women’s hormones. The amount of ingredients absorbed systemically is understood to be reduced in that it is applied topically and absorption is, for the most part, localized to the scalp as opposed to ingesting the ingredients orally. But just to be sure, it is not recommended for pregnant or nursing mothers to use this product. In all other cases one could consult their doctor as each individual situation and current drug therapies may need to be considered.