ACE-031 is a synthetic protein developed to inhibit myostatin, a natural regulatory protein that limits muscle growth in the human body. Originally created through a collaboration between Acceleron Pharma and Shire Pharmaceuticals, ACE-031 was investigated as a potential treatment for muscle-wasting diseases such as Duchenne Muscular Dystrophy (DMD).
How ACE-031 Works
ACE-031 is a soluble activin type IIB receptor (ActRIIB) fused to part of a human immunoglobulin (IgG1). It functions by binding to myostatin and related ligands, preventing them from interacting with their natural receptors on muscle cells. By blocking these signals, ACE-031 promotes muscle growth and strength.
Potential Benefits
Although not approved for medical use, ACE-031 has been researched for several potential benefits:
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Increased muscle mass
By inhibiting myostatin, ACE-031 may promote lean muscle growth, especially in individuals with muscle-wasting conditions. -
Improved strength and endurance
Clinical trials showed increases in muscle volume and grip strength in some participants. -
Therapeutic use for muscle-related diseases
It was studied primarily for conditions like Duchenne Muscular Dystrophy (DMD) and sarcopenia (age-related muscle loss). -
Possible use in metabolic health
Some studies suggested potential benefits in regulating fat mass and improving metabolic profiles.
Research and Clinical Trials
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In early-stage clinical trials, ACE-031 showed promising results in increasing lean body mass and muscle strength in patients with DMD.
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However, clinical development was discontinued in 2011 due to safety concerns and unexpected side effects, including minor bleeding and vascular abnormalities.
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Despite this, research into myostatin inhibition continues, with newer compounds being investigated.
Risks and Side Effects
While ACE-031 is not approved or widely available for therapeutic use, reported side effects during clinical studies included:
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Nosebleeds
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Gum bleeding
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Telangiectasia (small dilated blood vessels)
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Vascular issues
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Unknown long-term effects
These issues led to the suspension of its development.
ACE-031 in Bodybuilding (Off-Label Use)
Due to its muscle-building potential, ACE-031 has attracted attention in the bodybuilding and performance-enhancing communities. However:
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It is not legal for human consumption or sale as a supplement.
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Use is not regulated, and quality control of underground sources is questionable.
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Health risks are significant, particularly with improper dosing or prolonged use.




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