GDF-11
A myostatin-family protein with a controversial research history around tissue rejuvenation, anti-aging effects, and its true relationship to myostatin.
Overview
GDF-11 (Growth Differentiation Factor 11) is a TGF-β family member with strong structural similarity to myostatin (GDF-8). Initial parabiosis studies suggested it could rejuvenate aging tissues, generating significant anti-aging interest. Subsequent research has been mixed, with some labs unable to replicate the youthful effects — making it one of the most controversial peptides in longevity research.
Benefits
- Initially reported to rejuvenate cardiac, skeletal muscle, and brain tissue in aged animals
- Significant interest in longevity and circulating-factor research
- Effects on tissue repair under continued investigation
Mechanism of Action
Binds activin type II receptors and signals through the Smad2/3 pathway. Distinguishing GDF-11 from myostatin functionally has been difficult given their structural similarity.
Dosage (informational only)
- Typical range
- Research-only; human protocols not established
- Frequency
- Animal studies have varied widely
Mixed replication of anti-aging effects has tempered earlier enthusiasm. Some studies suggest muscle-wasting effects similar to myostatin.
Side Effects
- Limited human data
- Theoretical muscle-wasting concerns from TGF-β family activity
- Replication uncertainty undermines benefit claims
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