Best peptides for muscle preservation & growth
Growth-hormone-axis peptides, what they do, and why they’re a tool for protecting muscle — especially during weight loss.
Best peptides for…7 min read
When people ask about peptides for muscle, they’re usually circling the growth-hormone axis. Peptides like sermorelin and tesamorelin prompt your pituitary to release more of your own growth hormone in natural pulses — which supports lean mass, recovery, and body composition without taking the hormone directly.
How growth-hormone-axis peptides work
Sermorelin and tesamorelin are growth-hormone-releasing hormone (GHRH) analogs: they bind the GHRH receptor in the pituitary and ask it to release your own growth hormone on its natural rhythm. Sermorelin is the gentler entry point; tesamorelin is the stabilised sequence with the strongest trial evidence. The point isn’t supraphysiologic hormone levels; it’s restoring a healthier rhythm.
The big use case: protecting muscle
The most common modern reason for a muscle-preservation protocol is rapid weight loss — particularly on a GLP-1, which tends to shed some lean mass alongside fat. Preserving that tissue changes the outcome of the whole journey. This is Meto’s P2 Muscle Preservation territory.
What labs say first
A below-optimal IGF-1 is the classic signal that points here, and it’s the marker re-checked to confirm the protocol is doing its job. Metabolic and liver markers gate safety. Training and protein intake shape the plan — peptides amplify good inputs, they don’t replace them.