Follistatin vs Exenatide
Side-by-side comparison of key properties, dosing, and research.
Anabolic & IGF
FollistatinGLP-1 / Weight Loss AgonistsCognitive Enhancement
Exenatide- Summary
- Follistatin is an endogenous glycoprotein that acts as a potent inhibitor of myostatin and activin, two proteins that limit muscle growth. By binding and neutralizing myostatin, follistatin removes the primary brake on skeletal muscle hypertrophy, enabling significant muscle growth beyond normal physiological limits. It is distinct from its isoforms Follistatin 315 and Follistatin 344 in tissue distribution and binding affinity.
- Exenatide is a GLP-1 receptor agonist derived from the Gila monster lizard peptide exendin-4, with 53% homology to human GLP-1 and natural resistance to DPP-4 degradation. Available as twice-daily (Byetta) or once-weekly (Bydureon) formulation, it is also being studied for Parkinson's disease neuroprotection.
- Half-Life
- ~3–5 hours (endogenous form)
- ~2.4 hours (Byetta/twice-daily); Bydureon BCISE: weekly via microsphere release
- Admin Route
- IM, SubQ
- SubQ
- Research
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- —
- Typical Dose
- 50–100 mcg per injection site
- 5 mcg, titrate to 10 mcg
- Frequency
- Every other day or 2–3x per week
- Twice daily
- Key Benefits
- Potent myostatin inhibition enabling supraphysiological muscle growth
- Increases skeletal muscle mass and fiber size
- May accelerate recovery from muscle injury
- Potential benefits in muscular dystrophy and sarcopenia
- Synergistic with IGF-1 and growth hormone in anabolic protocols
- Animal studies show dramatic increases in muscle mass
- Reduces muscle fibrosis in dystrophic models
- Blood glucose control in type 2 diabetes
- Weight loss (average 2–3 kg in clinical trials)
- Once-weekly extended-release formulation available
- Reduces appetite and food intake
- Possible neuroprotective in Parkinson's disease (Phase II trials)
- Reduces systemic inflammation
- May protect pancreatic beta cells
- Cardiovascular neutral or potentially protective
- Side Effects
- Potential for excessive muscle growth if doses are not controlled
- FSH suppression with implications for fertility in women
- Theoretical risk of cardiac hypertrophy with prolonged high-dose use
- Limited human safety data available
- +1 more
- Nausea (most common, especially initially)
- Vomiting
- Diarrhea
- Headache
- +4 more
- Stacks With
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