The Claim

In common marmosets, 14 weeks of ACE-031 treatment increases specific force production in the extensor digitorum longus muscle by approximately 20–30% without altering absolute force, and this effect occurs without shifts in fiber type distribution.

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, 14 weeks of ACE-031 treatment increases the force generated per unit of muscle mass in the extensor digitorum longus muscle by 20–30%, without changing the total force output or the proportion of muscle fiber types.

See the scientific wording

In common marmosets, 14 weeks of ACE-031 treatment increases specific force production in the extensor digitorum longus muscle by approximately 20–30% without altering absolute force, indicating enhanced muscle quality independent of size increases, and this effect is observed without shifts in fiber type distribution.

Why this might work

A protein blocker stops signals that normally limit muscle growth and strength, allowing muscle fibers to generate more force per unit of size without getting larger or changing type.

Supported 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)

    The study gave marmosets a drug called ACE-031 for 14 weeks and found their muscles got stronger per unit of size without getting bigger overall or changing fiber types — just like the claim says.

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.