“Cardiovascular Effects of Performance-Enhancing Drugs“, Circulation, 2017, vol. 135, no. 1, pages 89-99
I still need to read the full paper, but from the abstract (emphasis mine):
This review will summarize the known health effects of PEDs but will also focus on the potentially greater health threat posed by the covert search for performance-enhancing agents that have yet to be recognized by the World Anti-Doping Agency. History has taught us that athletes are subjected to unmonitored trials with experimental drugs that have little or no established efficacy or safety data.
Many athletes who test positive for PEDs allege that they did so unknowingly. If that’s true*, it’s very possible that someone is going to exhibit an adverse reaction to a compound that they are receiving as part of someone’s experiment. Hopefully it’s nothing as severe as what some of the East Germans experienced.
*I can’t imagine implicitly trusting someone to an extent where I would ingest or inject anything they gave me, without question.