This content is for educational purposes only. Not medical advice. Always consult a licensed healthcare professional before using any peptides.

Back to Library
Growth HormoneHigh RiskNot FDA-approved. Gene therapy research compound.

Follistatin 344

The Myostatin Blocker

Follistatin 344 is a potent activin-binding protein that inhibits myostatin, the bodys natural limiter of muscle growth. By blocking myostatin signaling, it allows for accelerated muscle hypertrophy beyond normal physiological limits. Used primarily in advanced bodybuilding and performance contexts, it is one of the most powerful muscle-growth-promoting compounds available.

If You Take This

  • Inhibits myostatin — removes muscle growth limiter
  • Promotes rapid muscle hypertrophy
  • Enhances strength gains significantly
  • May improve muscle recovery
  • Potential anti-fibrotic properties
  • Synergistic with resistance training

Protocol

Dosing
100-300mcg subcutaneous daily for 10-30 day cycles. Most common: 100mcg daily for short, intense cycles. Do not exceed 30 days without extended break.
Cycle Length
10-30 days on, 30+ days off. Short, aggressive cycles due to potency and limited human data.
Half-Life
6-8 hours
Best Time
Morning or pre-workout
Method
Subcutaneous injection

Stacks Well With

IGF-1 LR3 (advanced stacking)MK-677Resistance training required

Avoid With

Avoid long-term continuous useCaution in anyone with reproductive health concerns (activin role in fertility)

Side Effects

  • Very limited human safety data
  • Potential reproductive effects (activin pathway)
  • Joint stress from rapid muscle growth
  • Possible tendon-to-muscle strength imbalance
  • Immune system modulation (theoretical)

Where to Buy

PepStack Price Guarantee

We track prices across 5+ verified vendors so you don't have to. Every vendor is vetted for purity testing, third-party COAs, and shipping reliability.

Prices last verified: April 2, 2026

Core Peptides

★ 4.8
BEST PRICE
$138.00
Vial
1mg
Purity
99%
Shipping
2-3 business days
Status
In Stock
Buy Now →

Biotech Peptides

★ 4.4
$162.00
Vial
1mg
Purity
99%
Shipping
2-5 business days
Status
In Stock
Buy Now →

We may earn a commission from purchases made through these links at no extra cost to you. This does not influence our recommendations. Learn more

Add to My StackBack to Library

For educational and informational purposes only. Not medical advice. Always consult a healthcare provider before starting any peptide protocol.