Trinity compound research profile
ACE-031
ACE-031 (also called ramatercept) is not really a "peptide" in the classic sense — it's a lab-made protein built by fusing part of a natural receptor...
Research overview
ACE-031 (also called ramatercept) is not really a "peptide" in the classic sense — it's a lab-made protein built by fusing part of a natural receptor (called ActRIIB) onto part of a human antibody. Think of it as a decoy: it's built to look like a docking station that certain "stop-growing" signals in the body attach to, so it can soak those signals up before they reach real muscle cells (Cadena et al. review, PMC). It's not related to growth hormone at all — it's a completely different type of molecule. It was created by scientists studying muscle-wasting diseases, hoping to help people grow muscle by blocking the body's natural muscle-growth brakes.
Mechanism under study
Your muscles have a natural "brake pedal" hormone called myostatin (and some related molecules) that tells muscle cells to stop growing once they've grown enough. ACE-031 works like a sponge that soaks up myostatin and similar molecules before they can push that brake pedal, so muscles get less of a stop signal and can grow more. The problem is that the same docking station ACE-031 mimics is also used by other signals that keep blood vessels healthy and stable — so when ACE-031 blocks those too, it can accidentally cause blood vessel problems (Cadena et al. review).
Human evidence summary
There have been two real human studies. The first was in 48 healthy older women who received different doses under the skin. At the highest dose, people gained about 3.3% more lean body mass and about 5.1% more thigh muscle (measured by scans) after about a month — a real, measurable effect (Attie et al., Muscle Nerve 2013). The second study tried it in boys with Duchenne muscular dystrophy, but doctors had to stop the study early because some boys got nosebleeds and small red spidery blood vessel marks on their skin. No one had a severe reaction, but because of this the study never showed whether it actually helped the boys walk or move better (Campbell et al., Muscle Nerve 2017). No study has ever shown ACE-031 helps healthy people build muscle for fitness or sports purposes.
Preclinical evidence summary
The existing profile data does not report separate animal study results for ACE-031 — the available evidence comes only from the two human trials described above.
Source material
Use the linked publications and records to evaluate study design, population, limitations, and relevance.