Probably the most well known is Rogaine, available at any drug store, in varieties for both men and women. Most scientifically-produced products do have separate products for males and females, because, of course, hormones in each are different and of different levels.An additional product containing minoxidil is Provillus, and, again, studies have shown it to be effective. The difference between Provillus and other similar products is that the makes have added Azelaic Acid, an additional ingredient which appears to enhance the follicle repair in both men and women. Provillus has been the subject of many studies, just as the other products, and level of effectiveness may be higher. Provillus is available for both men and women, and the treatment is a combination of a topical liquid applied to the balding areas, as well as a pill or capsule to be taken in conjunction with the liquid. The critical key to effectiveness, according to its makers, is the addition of the azelaic acid, however, the correct amount of this acid is most important piece of this treatment. As with most hair loss products, the makers recommend patience. It may take from 3-6 months for improvement to occur, however, there is a money-back guarantee up to 180 days if one is not satisfied that it is working for him/her.