Hello @vanessahampton, very interesting your post, I am one of those who think it is OK to prohibit athletes from taking steroids or some type of drug that may influence their performance and if this hormone does also I agree that they prohibit it because but it would not be a fair game, it is assumed that if you are good at something you are by nature not because you take something that makes you perform more, with respect to Messi I do not think that taking that hormone at the beginning of his career influences what is Nowadays, Leonel Messi is a star and his awards certify him, never open another like him so take growth hormone jajajajaja, he is a football star. Regards!!