A couple of deleted scenes from Bigger, Stronger, Faster regarding roid rage:

I was quite interested to hear (presumably a doctor) say that the human male testes produces around 50-75mg of testosterone per week, and up to 300mg per week there are almost never any psychiatric effects, and 300-1000mg you get a few people to develop irratability and aggreesiveness. There have apparently been 4 or 5 studies that have carried out tests in the 500-600mg range, and there were 5 cases of "roid rage" out of about 100 people.