Do peptides cause receptor downregulation?

The idea that a peptide makes its docking spots stop working as well (downregulation) is a specific claim. It is not true of peptides by default. The one family measured in people is the growth hormone releasers. In healthy men, a steady GHRH signal partly dulled the pituitary's response within hours. Daily GHRP-2 lowered peak growth hormone over five days in nine healthy men. But the same research group found no dulling after 14 days of steady GHRH. Nobody has measured downregulation for BPC-157, TB-500, GHK-Cu, MOTS-c, or the other compounds people ask about. A forum claim that you must cycle to rest your receptors is not a finding unless someone has measured it. Full citations at /cycling.

Full cycling page: what was tested versus assumed

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of cycling and clearance. Whether peptides need a break, what a half-life actually tells you, and where a real cycling mechanism has been measured. Full detail at /cycling.