Pumpkin Seed Oil May be Good to Prevent Hair Loss

I would like to know-does pumpkin seed lower dht level all over the body or just from the scalp?c an topical application of it mean dht will only be lowered from the scalp? 

To our knowledge, this is the first randomized, double-blind, placebo-controlled trial to investigate the efficacy and tolerability of PSO in men with mild to moderate AGA. This study shows that PSO supplement during 24 weeks has a positive anabolic effect on hair growth and that this is due to the possible effects of 5-reductase inhibition in patients with mild to moderate male pattern hair loss. The authors concluded:   “this double-blinded study did involve 76 subjects and, to the best of the authors’ knowledge, is the first study to examine the long-term efficacy of PSO on AGA. The study shows that PSO could improve AGA and that it should be considered a potential alternative treatment. However, replication will be needed in order to confirm the results of this first-stage study and additional studies are required to elucidate the mechanism responsible for the positive effects of PSO on AGA.”

Ref:  Evid Based Complement Alternat Med. 2014; 2014: 549721.

Effect of Pumpkin Seed Oil on Hair Growth in Men with Androgenetic Alopecia: A Randomized, Double-Blind, Placebo-Controlled Trial