Muscle & Performance

A synthetic long-acting trigger for growth hormone release, tested in humans briefly in the early 2000s and then abandoned. Sold now only as an unlicensed research chemical.

Grade C · Some human data, far from settled.

An old experimental peptide that triggers a growth hormone burst, but the body quickly adapts and it was never approved as a medicine.

Grade C · Some human data, far from settled.

A lab-made peptide that nudges your own pituitary gland to release a pulse of growth hormone. Proven to do that in humans, but never proven to actually make anyone healthier, stronger or leaner.

Grade C · Some human data, far from settled.

A natural protein that jams the muscle-growth brake by binding myostatin, but the only real human evidence comes from gene therapy in muscular dystrophy patients, not from the injectable peptide sold online.

Grade D · No meaningful human evidence yet.

A lab-engineered, longer-lasting version of the body's growth factor IGF-1, sold as a "research chemical" for muscle building, though it has never been tested in humans for that purpose.

Grade D · No meaningful human evidence yet.