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Caffeine is not a banned substance. WADA approve this drug for use in all sports and competitions. Personally, I also wish performance-enhancing drugs never existed... Unfortunately, they do though. I wrote a very controversial article on this subject, check it out: https://steemit.com/steemstem/@exercisinghealth/should-certain-drugs-be-used-in-some-sport

performance enhancers are a night mare to sports