While hypertrophy refers only to muscle fiber size, myostatin also controls the number of muscle fibers, which may increase with decreased myostatin.

Research suggests it may block the effects of activin, myostatin, and follicle-stimulating hormone. Follistatin-344 Peptide and Muscle Cells ...

Follistatin-344 is a full-sized synthetic version of Follistatin found in nature. Studies suggest it may inhibit the actions of FSH, myostatin, and activin. Both hypertrophy and hyperplasia, or ...

Myostatin (GDF8): A negative regulator of skeletal muscle growth; inhibition leads to increased muscle mass. Activin A: A protein involved in the regulation of muscle mass and differentiation ...