Of course there is also the point that many supplements (and foodstuffs) are not labelled sufficiently to enable even the casual consumer to determine the contents. Think about all those E numbers used in additives in Europe - does anyone here know what they all are? Their scientific names and what chemicals they contain?
But I do think that in the world of sports there are nutritionists and dieticians paid a huge amount of money who would have advised on supplements and SHOULD know what they are talking about. If these guys allege that they were taking supplements and they didn't know what is in them then they must be daft. Someone hasn't done their homework.
------------------
Time is an illusion. Lunchtime doubly so.
Epona of The Laughing Hyenas