Follistatin 315

Follistatin 315 is a circulating isoform of follistatin, a glycoprotein that antagonizes activin A and myostatin. Researchers study its systemic effects due to its role in regulating growth factors.

In the literature, Follistatin 315 appears most often in work focused on muscle growth, muscle preservation and cellular repair. Studies in this area tend to look at mechanisms and observed effects in laboratory and preclinical settings rather than outcomes in people, so the picture is best read as a map of where researchers have been curious — not as evidence of any benefit.

Follistatin 315 is catalogued here under powder peptides. Coverage of this compound varies in quality and depth, and much of it remains early-stage. Reading the underlying research directly is the only way to judge how strong any particular finding is.