L-Carnitine (INJ) + EPO is the ultimate stack. Nothing on the market would beat this combo - absolutely nothing!
I'd caution GW501516 - read about the cancer and liver risks.
PS - Epo has risks but not if you know what you are doing.
So you really think the inj l-Carnitine makes that much of a difference when it comes to endurance?
not questioning you, just honestly curious.