you use it to supply DHT to the body. it seems to enhance the efficacy of Test and control estrogen, among other things. most guys take it, though, as in my case, to make your libido go crazy. i take 25mg ED during Test cycles as an anti-E and then i bump it to 50mg ED right after my cycle to make sure i have no libido crash. it definitely makes you horny but you have to take it every day. it's not a "spot drug" like Viagra.
Nadr