Saw Palmeto

Some evidence that it blocks DHT. Sexual side effects.

Prager N, Bickett K, French N, Marcovici G. A randomized, double-blind, placebo-controlled trial to determine the effectiveness of botanically derived inhibitors of 5-alpha-reductase in the treatment of androgenetic alopecia. J Altern Complement Med. 2002 Apr;8(2):143-52. doi: 10.1089/acm.2002.8.143. Erratum in: J Altern Complement Med. 2006 Mar;12(2):199. PMID: 12006122.