Follistatin 344
FS-344 / FST-344 / Follistatin
A naturally occurring glycoprotein that binds and neutralizes myostatin, activin, and other TGF-beta superfamily members. Myostatin is the primary negative regulator of muscle growth — by inhibiting it, follistatin 344 removes the biological 'brake' on muscle development. The 344-amino acid isoform is the full-length systemic form with broader tissue distribution.
Half-life
Unknown (limited pharmacokinetic data)
Typical Dose
100 mcg/day
Route
subcutaneous
Category
growth_hormone
Evidence Overview
Strength of evidence across clinical, expert, and experimental lanes.
How Follistatin 344 is dosed in practice
Usually taken by subcutaneous (SubQ) injection. Typical range: 100 mcg/day. Half-life: Unknown (limited pharmacokinetic data). Each card gives the dose, frequency and duration from one evidence lane: Clinical (human trials), Expert (practitioner protocols) or Experimental (early or animal data). These ranges describe what has been studied or used; they are not a prescription.
Work out the units to draw with the reconstitution calculator, how long a vial lasts with the vial duration calculator, and how levels fall between doses with the half-life calculator.
Underground bodybuilding community uses injectable follistatin for rapid muscle gain. Results are highly variable and controversial. Extremely expensive. Some users report noticeable strength gains within days; others report nothing. Quality and authenticity of research-grade follistatin is a major concern.
- Bodybuilding forum follistatin cycle logs
- Myostatin inhibitor community research
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Known interactions with other compounds. Click nodes to explore connections.
Safety & Contraindications
- Cancer history (removing growth inhibition signals is risky)
- Cardiac conditions (uncontrolled muscle hypertrophy risk)
- Pregnancy or breastfeeding
- Tendon or connective tissue weakness (muscle outpacing structural support)
Follistatin 344: common questions
What is Follistatin 344?
A naturally occurring glycoprotein that binds and neutralizes myostatin, activin, and other TGF-beta superfamily members. Myostatin is the primary negative regulator of muscle growth — by inhibiting it, follistatin 344 removes the biological 'brake' on muscle development. The 344-amino acid isoform is the full-length systemic form with broader tissue distribution.
How is Follistatin 344 dosed?
Follistatin 344 is usually taken by subcutaneous (SubQ) injection. Typical range in DoseCraft's library: 100 mcg/day. Experimental (early or animal data): 100 mcg daily SubQ; Once daily; 10–30 days (short cycles only). These ranges describe what has been studied or used; they are not a prescription.
Is Follistatin 344 FDA-approved?
No. Follistatin 344 is not approved by the FDA for any use in people.
What is the half-life of Follistatin 344?
DoseCraft's library lists a half-life of Unknown (limited pharmacokinetic data). Half-life sets how often a compound is dosed and how long it takes to clear: about five half-lives.
Who should not use Follistatin 344?
Listed contraindications: Cancer history (removing growth inhibition signals is risky); Cardiac conditions (uncontrolled muscle hypertrophy risk); Pregnancy or breastfeeding; Tendon or connective tissue weakness (muscle outpacing structural support).
Information is for educational purposes only. Always consult a licensed healthcare provider before starting any peptide regimen.
Page updated . How we grade evidence: methodology.