I figured this would probably be the best place to post this... I have a question about increasing testosterone naturally... if I type that into google.com I get a bunch of pheromone ads or whatever it's called. I'm looking for research on what activities or diets can increase testosterone. For example I heard that Cortisol isn't "compatible" in the brain with testosterone, one or the other type of thing... also read that caffeine can increase cortisol levels... thus does large amounts of caffeine decrease testosterone? What about Ephernine? Also read that in the morning testosterone (in males) can increase by up to 25% and decrease about that same amount in the late evening... also said that working out produced an increase in testosterone as did competive sports. Anyone know of some good research papers (website or books) that deal with this?