Follistatin-344 is a synthetic version of a naturally occurring protein found in most body tissues. It is primarily researched for its ability to bind and inhibit myostatin, a protein that limits muscle growth, potentially supporting increased muscle mass. Additionally, Follistatin-344 may play regulatory roles in reproductive processes and cellular development by interacting with proteins like activin, BMPs, and GDF9. Its actions are being explored in muscle science, fertility research, and tissue growth regulation.