What Follistatin actually is

Follistatin is an endogenous protein that binds and inhibits myostatin (GDF-8) and activin A — both of which suppress skeletal muscle growth. Loss-of-function myostatin mutations produce the well-known ‘double-muscled’ phenotype in cattle and dogs, and a single human case report shows similar hypertrophy.¹

Follistatin-344 and Follistatin-315 are the most-studied forms in peptide practice. Gene-therapy approaches with follistatin have shown striking muscle-mass effects in dystrophy models, but peptide-form follistatin has more modest and less well-characterized human data.²

At Luxbae, Follistatin is prescribed and supervised by Dr. Ernst von Schwarz, MD, PhD after a complimentary medical consultation.

Mechanism — Myostatin and activin sequestration

Binds circulating myostatin/activin A with high affinity, blocking their suppressive effects on muscle protein synthesis.¹

What the research shows

Myostatin antagonism. Sequesters myostatin to release the brake on muscle protein synthesis.¹

Hypertrophy signal. Striking effects in animal models and gene-therapy trials.²

Connective tissue. Activin A inhibition has broader effects on fibrosis and tissue remodeling.³

Side effects: Limited human data. Injection-site reactions, possible fluid retention, theoretical effects on cardiac and other smooth muscle.

FDA note: Follistatin is not FDA-approved. Gene-therapy approaches are in clinical trials for muscular dystrophy. Peptide use is investigational.

Follistatin FAQ

Will I gain noticeable muscle?
Animal and gene-therapy data are striking; peptide-form human data is more modest.

Is this safe?
Long-term human peptide data is limited. We use cycles and monitor.

References

1. Schuelke M, Wagner KR, Stolz LE, et al. Myostatin mutation associated with gross muscle hypertrophy. N Engl J Med. 2004;350(26):2682-2688.
2. Mendell JR, Sahenk Z, Al-Zaidy S, et al. Follistatin Gene Therapy for Sporadic Inclusion Body Myositis. Mol Ther. 2017;25(4):870-879.
3. Lee SJ. Regulation of muscle mass by myostatin. Annu Rev Cell Dev Biol. 2004;20:61-86.