TweetShort answer would be no. The link you provided sells supps so they're study would certainly be skewed. I read somewhere that some supp companies have actually used things like clen and tbol in the supps but later took them out. As always supps play a roll but not as big as the supp manufacturers, retailers and sponsored athletes claim. Nutrition is first and foremost, it's also the most overlooked, imo and then supps and aas for the big gains.