Is follistatin steriode

Follistatin is not a steroid; it is a glycoprotein that plays a role in regulating various biological processes, including muscle growth and reproductive functions. It functions primarily by inhibiting myostatin, a protein that limits muscle development. Follistatin is produced naturally in the body and is involved in the regulation of muscle mass and other physiological processes, but it does not share the chemical structure or properties of steroid hormones.