Here's another example of why its best to avoid any kind PED's:
http://news.sky.com/story/1282497/gps-to...-condition
For years and years medical knowledge has been saying that Asprin is harmless and can be good to help reduce strokes etc. But now knowledge has moved on and the medical profession realise their previous knowledge was wrong. And this is with a major mainstream drug, not some of your so called PED's which do not have significant research and trials etc carried out.
Best to stay clear altogether and only use med's when you actually have something wrong that needs to be treated.