One of the cleanest GH-releasing peptides available, known for its selective action and minimal side effects. Often considered the best starter peptide for GH optimization.

A pentadecapeptide derived from human gastric juice, widely studied for its remarkable tissue-healing properties across tendons, ligaments, muscles, and the GI tract.

A synthetic fraction of Thymosin Beta-4, a naturally occurring peptide found in high concentrations at wound sites. Known for its systemic healing and anti-inflammatory properties.

One of the earliest GH-releasing peptides discovered. Potent GH stimulator but less selective than Ipamorelin — causes significant hunger and affects cortisol/prolactin levels.

The most potent growth hormone releasing peptide, producing the highest GH pulse. Slightly more selective than GHRP-6 with less appetite stimulation, but still affects cortisol and prolactin.

A long-acting GHRH analog that provides sustained GH release over a full week. The DAC modification extends half-life from minutes to days, making it a once-weekly peptide.

An enhanced version of IGF-1 designed for extended bioavailability. Unique in that it promotes muscle cell hyperplasia (new muscle cells) rather than just hypertrophy (bigger existing cells).

A myostatin inhibitor that removes the natural brake on muscle growth. Gene therapy approaches using follistatin have shown dramatic muscle increases in animal models and early human trials.

A locally-acting growth factor released naturally when muscles are damaged by exercise. Activates dormant satellite cells to begin the repair process that leads to muscle growth.

An injectable myostatin trap developed by Acceleron Pharma for muscular dystrophy. Showed significant muscle mass increases but was halted due to vascular safety concerns.