If you're aiming for high protein density, soy protein is the clear winner. It contains up to 90% pure protein per 100 grams, making it one of the most concentrated sources of plant-based protein available. Even more importantly, soy is a complete protein, meaning it contains all 9 essential amino acids your body needs to build and repair muscle.

 Pea protein comes in second with about 80% protein content. While rich in branched-chain amino acids (BCAAs), it lacks methionine, an essential amino acid. Almond protein, on the other hand, contains only about 50–60% protein and is better suited as a supplementary ingredient rather than a primary source.