Soy Peptides

Soy protein is enzymatically cut into low-molecular-weight peptides that absorb faster. The amino-acid spectrum includes tryptophan and branched-chain amino acids; it is a complete plant-protein hydrolysate. People doing vegetarian resistance training rely on it for myofibrillar building blocks; leucine can still drive the synthesis signal.

Some peptide fragments in soy hydrolysates inhibit angiotensin-converting enzyme in trials; blood-pressure research often cites this class of plant peptide. Extended formulas from fermented soy foods can also yield these fragments. People who watch plant short peptides and blood-pressure markers map onto this line.