Rice protein is low in lysine so using it as your only protein source is not ideal. (blog.nkdnutrition.com)
Biological value, protein efficiency ratio, and all the other terms thrown around are a primary concern if a protein source is one's ONLY protein source. (completehumanperformance.com)
Six Star ® 100 % Soy Protein delivers soy protein as the only protein source. (sixstarpro.com)