Minoxidil is a popular hair regrowth treatment for men that is available in the form of a topical solution. It is used to help regrow hair on the top of the scalp. The positive effect of minoxidil on hair growth is mainly due to its metabolite, minoxidil sulfate, and the enzyme responsible for this conversion is sulfotransferase, which is located in hair follicles and varies in production among individuals
. However, it is not known how minoxidil causes hair growth
. One of the potential negative aspects of minoxidil is that it may cause scalp irritation for some users
. The active ingredient in minoxidil solution is minoxidil 5% w/v
. The product is not for use by women
. Some minoxidil products are available with added herb, botanical, and plant ingredients, such as biotin
