Follistatin 344

Performance & Body Composition
Phase 2

Follistatin is a naturally occurring protein that blocks myostatin, a molecule that limits muscle growth. It is being studied for muscle wasting conditions and performance enhancement. Gene therapy approaches using follistatin are also in development.

Last updated March 6, 2026
88 PubMed-Verified Studies
Popular
Research-Driven Dosage Reports
RouteSubcutaneous (SC) · Intramuscular (IM)
Dose100–300 mcg
Frequency1× daily for 10–30 days
Duration10–30 days (cycling recommended)

Based on published research literature.

Swiss Chems|Exclusive Offer
Coupon
10%
Off

Use our affiliate link and code PEPTIDEWIKI at checkout to unlock your 10% discount, every time you use the code.

Shop Now

For research purposes only. PeptideWiki may earn a commission at no extra cost to you.

Overview of Follistatin 344

Binds to and neutralizes myostatin (GDF-8) and activins, removing the 'brake' on muscle growth and allowing enhanced muscle development.

Muscle growth / performance

Binds to myostatin with high affinity, preventing myostatin from signaling through activin receptors to limit muscle growth.

Also binds activins A and B, as activins have overlapping effects with myostatin on muscle and other tissues.

Removal of myostatin inhibition allows enhanced muscle protein synthesis and satellite cell activation, promoting muscle hypertrophy.

Isoforms

FS344 is full-length form that can be cleaved to shorter forms, and FS315 is another commonly referenced variant.

Gene therapy research

Being investigated as gene therapy for muscular dystrophy and muscle wasting conditions, with potential therapeutic applications

Read Full Follistatin 344 Dosage Guide

Research-backed dosing protocols, timing, and administration details

Browse more in this category

Performance & Body Composition