Plasma is mostly water but also contains minerals and proteins, transports So the same shit your pumping into your body and want the most of , you'll just be giving it right back. Not a Smart Idea IMO. Plus they suggest not working out the same day , for the fact that there is a huge hole left in your vein which when enlarged during the "pump" ruptures.30 bucks a month is not worth toying with your health. It takes like 2 days to naturally replenish what you just sucked out of your body. You want your bloodflow to be full throttle while training, that totally defeats the purpose.