Myostatin is a protein that limits muscle growth. Researchers tested drugs that block myostatin to see if they could build muscle in people. Most studies found that these drugs produced little to no increase in muscle mass.
See the scientific wording
Human trials of myostatin inhibition have shown modest results, with most studies demonstrating little or no increase in muscle growth.
There's disagreement
Randomized trialsThe 4 studies we reviewed point in different directions — there's no clear consensus.
What the research says
4 studies reviewedSupporting (2)
Randomized Controlled TrialHuman2016
This study tested a drug that blocks myostatin, but it didn't make people's muscles grow much—just a tiny increase at some time points, and not enough to meet the main goal. So it agrees with the idea that these drugs have small effects.
Randomized Controlled TrialHuman2017
Boys with Duchenne muscular dystrophy who received the myostatin-blocking drug did not show significant muscle growth or strength improvement compared to those who got a placebo, consistent with the claim that such drugs have modest effects.
Contradicting (2)
Randomized Controlled TrialHuman2025
This study tested a drug that blocks myostatin, and found that it did help build some muscle, especially when combined with another blocker, which goes against the claim that these drugs hardly work.
Myostatin antibody (LY2495655) in older weak fallers: a proof-of-concept, randomised, phase 2 trial.
Randomized Controlled TrialHuman
This study tested a drug that blocks myostatin in older people and found that it actually increased muscle mass, which goes against the idea that these drugs don't work for building muscle.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 supporting, 2 contradicting studies
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