Originally Posted by MoAlpha

Except it almost certainly doesn't work.

https://www.ncbi.nlm.nih.gov/pmc/art...0economy%20(RE).

This review discusses the erythropoietin studies cited by the supplement maker and others' failure to reproduce the effect even at higher doses, along with the unanimous absence of biomarkers of increased O2 carrying capacity, such as hematocrit and hemoglobin concentration. If erythropoietin really went up those things would have to change, as they do, reliably and at the individual level, with altitude training.

Viewed from the standpoint of clinical research, most trials in exercise science are garbage anyway. There are some admirable counter-examples, but most of these guys wouldn't know a preregistered study or a power analysis if it bit them in the ass.