Follistatin 344 1mg

Follistatin is a naturally occurring protein that inhibits members of the TGF-β superfamily, most notably myostatin and activin, which are known to limit muscle growth. There are two primary isoforms used therapeutically: Follistatin 344, which is longer-acting and more systemic, and Follistatin 315, which is shorter-acting and more targeted. Both promote muscle growth, fat reduction, and regenerative processes.

Originally identified in the 1980s, follistatin has since been researched for its role in muscle development and fertility regulation. Synthetic versions of Follistatin 344 and 315 are now used in research and performance contexts due to their ability to inhibit myostatin and support muscle hypertrophy.