Follistatin is a naturally occurring glycoprotein that has been investigated in preclinical and experimental research for its alleged roles in myostatin modulation, cellular growth regulation, and tissue signaling pathways. Scientific studies have explored its potential influence on muscle-related biological processes and cellular differentiation; however, these effects remain investigational and are not clinically established. Follistatin is not an approved drug or dietary supplement and is supplied for research use only. Not for human or veterinary consumption.