What your interest? Always study and ask questions. Learn is medical use and good vs bad. With every medication or supplement. There is always a benefit and a negative. Never let any doctor tell you differently. You always want the benefit to out way the negatives. Negative and positive both could be dose related. Any successful builder or successful person has to start with a game plan. This same we should do with supplements. Watch HGH and IGF videos below.
https://youtu.be/Mm3PyzFl0a0