Xandrox15 already contains 5% azelaic acid to decrease DHT in the scalp. Why add finasteride?

A. Although topical azelaic acid will prevent the synthesis of DHT in the scalp where it is applied, it does not protect the hair follicles from DHT circulating in the bloodstream. Finasteride applied topically can and does decrease the serum DHT and, although the 5-alpha reductase enzymes in the scalp is primarily Type I, there are also Type II 5AR's in the scalp that the topically applied finasteride can inactivate.

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