Follistatin is a secreted glycoprotein that binds and neutralizes activin and myostatin, two transforming-growth-factor-family ligands that restrain muscle mass, making it central to muscle-biology and differentiation research. Its regulatory role extends to reproductive and hepatic systems, supporting broad experimental use. The protein is delivered as a white lyophilized powder at confirmed purity in sealed vials, and batch documentation is provided with each order. Orders are processed with clear communication at each stage, from quotation and payment confirmation to packing and departure notification, and a tracking number is provided once the parcel is handed to the courier. Combined orders of multiple catalog products are welcomed and consolidated to reduce freight costs.