Epidemiological data suggests growth hormone and IGF may be detrimental, but dose, age, and gender require nuanced understanding.

“the epidemiology if you're in sort of you know vaulters camp is that would be the worst thing you could ever do growth hormone is bad because IGF is bad but again the epidemiology tell a different story tell a much more nuanced story that has to do with how high is too high at what age and for what gender and with respect to what disease”