Ok, two friends of mine from Boston who both trade mid 6 figures accounts privately started using bodybuilding drugs a few months ago. In particular Testabol Propionate. They are not working out, though. They are not looking for any physical improvement, rather for a psychological effect. Both day trade ES futures since years. The sole reason (or so they say) is that a higher dose of testosterone in their blood increases their aggressiveness while trading. Also, so one claimed, it feels "easier" to enter seemingly risky positions. They claim their performance in $ amounts increased by 20-25% since they started the testosterone injections. I was unable to verify this, could all be BS but I've know these guys for years. I find this both very disconcerting and interesting. Is there any research anywhere about the influence of testosterone on mental performance and decision making? Thanks.