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i have yet to see any studies that show IGF-1LR3 is of any use for endurance athletes who are not looking for muscle.
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It increases red blood cells(RBC), and RBC carries oxygen, so that's definetly an advantage to the endurance athlete.
Erthyropoetin (EPO) does this aswel, and that is why endurance athletes jab that aswel, actually even sprinters use EPO.