prohormones can have the same side effects as anabolic steroids and it depends on the user which side effects is experienced. Some side effects are acne, hair loss, breast tissue enlargement and prostate swelling...using prohormones under the age of 21 and especially 18! is a very bad idea.. it can result in the closure of growth plates... resulting in permanently stunted growth.... it can also result in potentially serious endocrine system problems.