The Book of Peptides is not a clinic and not your doctor. We do not sell, prescribe, recommend, or personalize any compound, and no grade or ranking here is an endorsement. In the United States, most of these compounds are not FDA-approved and are sold for laboratory research only; a few are prescription drugs, and some are controlled substances or banned in sport. Possessing or administering an unapproved compound outside an authorized setting may be unlawful. Nothing here is a recommendation to buy, possess, or self-administer anything. Consult a licensed physician before any decision involving peptide use.
Follistatin's role in inhibiting myostatin is well established in animal models and rare human myostatin-deficiency case studies. As a self-injected product it has essentially no controlled human data of its own, and animal research on systemic myostatin inhibition has raised unresolved questions about cardiac tissue effects.
