PepEvolutionFollistatin 344
A myostatin-inhibiting protein with real anabolic mechanism — but zero trials on the retail vial form and the hardest-to-verify sourcing in the catalog.
Verdict — F · Avoid / High-Risk
A real anabolic mechanism wrapped around near-zero human evidence for the product actually sold, the hardest-to-verify sourcing in the catalog, and a genuine off-target risk from systemic myostatin inhibition. Avoid for almost everyone.
Overview
Follistatin-344 is a recombinant form of the natural myostatin-binding protein follistatin, marketed as an injectable for muscle growth. The human follistatin research that exists comes almost entirely from gene-therapy contexts, not from the retail injectable peptide — there are effectively no clinical trials on the vialed product being sold. As a comparatively large, fragile protein it is exactly the kind of molecule independent labs struggle to confirm, so sourcing is the least verifiable in the catalog, and uncontrolled systemic myostatin inhibition carries real off-target tissue-growth and fibrosis concerns.
PepScore Breakdown — the four axes
Evidence
35% weightHow strong is the published human science?
Sourcing & COA
30% weightOur moatCan a buyer obtain an independently-verified, high-purity version? — our proprietary layer.
Safety & Risk
25% weightWhat is the real-world harm potential?
Practicality
10% weightHow easy is it to actually run a verified version?
Sources & Citations
Every claim cites a primary source. Citations are machine-audited against NCBI — see methodology.
Educational only — not medical advice. PepScore is an educational research grade, not a prescription or dosing recommendation. Some vendor links are affiliate links — this never affects grades. Consult a licensed healthcare provider before using any compound.