* Azelaic acid - promoters claim it is "Proven to inhibit up to 100% of DHT where applied." The evidence for this claim is uncertain. A study titled "Inhibition of 5a-reductase activity in human skin by zinc and azelaic acid" found a 90% inhibition of 5a-reductase activity in vitro with an azelaic acid and zinc combination. There was an additive effect between the two compounds.
* Spironolactone
* Capilor - promoters claim it is "the natural way to keep your hair" and that it is "Clinically proven to work on Men and Women." The website contains the disclaimer "These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease." http://www.capilor.com
* Retin-A (Retinoic acid; chemical peel stimulation of scalp)
* Avacor - discredited[15]
* LLT or Low-level Laser Therapy; Not FDA approved for hair regrowth, but only as a cosmetic hair enhancer. Treaments are administered at either a clinic or salon (most of which are in Europe), or by the individual user via a home-based portable system. For example, "The Laser Comb".[16] No official results have been proven or published in regards to hair regrowth.
* Stinging nettle recommended by The Green Pharmacy

Table of Contents:
General concerns
Copper peptides
Diet and Lifestyle
Hair transplant
Hair multiplication (future treatment)