Soy protein has half the biological value of whey protein. You can build muscle with it but you'll need twice as much. I use EAS brand 100% whey protein (the brand doesn't matter, but BJ's stocks EAS in big bags and the chocolate one tastes decent) and mix two scoops of it with one of dextrose, which spikes insulin levels and stimulates glycogen replacement faster than any other type of sugar.
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