The Claim

ACE-031 treatment in common marmosets increases lean body mass without altering fat mass, indicating a selective anabolic effect on skeletal muscle rather than generalized weight gain.

Source: ACE-031, a soluble activin type IIB receptor, increases muscle mass and strength in the common marmoset (Callithrix jacchus)

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
16score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

How it works
1 study reviewed
In plain English

In common marmosets, ACE-031 treatment increases lean body mass while fat mass remains unchanged, demonstrating that the effect is specific to muscle tissue and not due to overall weight gain.

See the scientific wording

ACE-031 treatment in common marmosets increases lean body mass without altering fat mass, indicating a selective anabolic effect on skeletal muscle rather than generalized weight gain.

Why this might work

A protein blocker binds to signals that normally stop muscle growth, which allows muscle cells to build more protein and break down less, causing muscles to get bigger and stronger without changing fat levels.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: ACE-031, a soluble activin type IIB receptor, increases muscle mass and strength in the common marmoset (Callithrix jacchus)

    ACE-031 made monkeys grow stronger muscles without getting fatter, showing it targets muscle growth specifically, not just making them heavier overall.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.