Sermorelin

Sermorelin prompts the pituitary to release the body's own GH, while prescription growth hormone (somatropin) supplies the hormone directly. In children with GH deficiency, direct GH worked better: in a 6-month randomized trial in 60 children, growth rate was 14.6 cm/yr with GH versus about 9.2-9.3 cm/yr with sermorelin given by continuous infusion. Vendor copy often says sermorelin is safer and keeps natural production intact, but we found no trial in adults that compared their safety or long-term effects on natural GH output. Both are prescription medicines in the US, and research-use vials aren't equivalent to either. Talk to a healthcare professional before using any compound that changes hormone levels.

There's no tested timeline for the adult goals people use it for. In the 6-week study in men aged 64-76, nightly sermorelin raised GH but didn't change IGF-1, weight or body composition, though 2 of 6 strength measures improved. Clinic and community guides claim better sleep within a few weeks and changes in fat, skin and energy after 3-6 months; these are self-reports, and we couldn't find a study that measured them. In GH-deficient children, growth rate rose within 6 months of daily treatment.

The body's largest natural GH pulse comes in the first hours of deep sleep, and users time doses to coincide with it. The trials also gave it at night: once daily at bedtime in the pediatric trial and nightly in the study of older men. The empty-stomach habit rests on the idea that food, through the insulin rise after a meal, blunts GH release; no study has tested meal timing for sermorelin. The authors of the older-men study noted that single nightly doses seemed less effective than multiple daily doses at producing GH and IGF-1 effects.

No study has tested cycling. The 5-days-on, 2-off weekly schedule, the 3-6 month courses and the month-long breaks come from vendor and community guidance, usually justified as keeping the pituitary responsive. In the pediatric trials, children took it daily for up to a year without a break. In one 6-month trial, nearly all children developed antibodies to the peptide, but antibody levels weren't linked to how much they grew and had mostly cleared 9 months after stopping. Talk to a healthcare professional about any long-term use.