Most likely at your local vitamin shop.
Soy protein powder is a great way to get some extra protein in one's diet. Soy is a complete protein, containing all the essential amino acids the human body needs. It is also a great alternative to whey protein to those who are dairy sensitive.
75 calories.
EAS is a good protein powder and so is Muscle Milk but it all comes down to taste and if you want a full whey protein or a complex powder that has whey and soy. EAS is my favorite.
Soy is a complete protein.
Try Shaklee.com, I like theirs very well. You can also buy their soy protein powder and make your own bars (very tasty). Soy protein is more beneficial. See their website for their scientific analysis.
Isolated Protein "Soy"
Soy protein is the protein that is extracted from soybeans.
Whey protein isolate generally has the highest percentage of protein, usually around 90-95% protein content per serving. Soy protein isolate and pea protein isolate are also high in protein content, with around 90% protein per serving.
formula for hydrolyzed soy protein
Soy milk powder is a dairy alternative that offers benefits in baking and cooking due to its long shelf life, convenience, and ability to provide a creamy texture and added protein to recipes.
soy
Body builders are known to have protein supplements to build their body. They are formulated powder produced containing proteins of egg, soy, whey or any other protein food. This can be taken as protein shakes after workouts.