It is nave to imagine that any study would convince athletes that steroids are not effective. They might conclude that the dose used was too small. Anabolic steroids, when used in large doses, are strongly linked to liver cancer. Very large doses - up to 400mg/day - are used in sport, this is more than 10 times the maximum dose normally used therapeutically. The administration of large doses to healthy subjects for a medical trial would be unethical.
Retired Professor of Chemical Endocrinology