I am a professional athlete and am always worried about protein absorption and intake.
I was vegan for about eight years. Now, aside from the whey protein I continue with my vegan diet.
Some of the best sport doctors recommend whey, however they all say that protein is best when it is real food i.e. beans, grains, tofu, whatever. absorption is better.
soy protein powder is very difficult for our bodies to absorb.
proteins also need aminos, minerals and vitamins for absorption. vitaminB complex, Vitamin C and folic acid are important for muscle growth.