Ketoconazole
Ketoconazole is an anti-fungal and potent 5-alpha reductase inhibitor that is often used as a topically applied supplement to other hair loss treatments.
It is interesting to note that placebo treatments often have reasonable success rates (and similar side effects) in studies, although the success rate tends not to be as high as with the product being tested.
Concealing Baldness
There are times when the best hair loss product is a cover up of some kind. This is especially true when the hair loss is temporary, such as when hair falls out during chemotherapy. Several organizations produce hats or caps for cancer sufferers.