Do peptides cause receptor downregulation?

Receptor downregulation is a specific claim, not a default property of peptides. The one family with human measurements is the growth hormone secretagogues. Continuous GHRH stimulation has been shown to partially blunt the pituitary response within hours in normal men, and daily GHRP-2 reduced peak growth hormone over five days in nine healthy men. The same research group also found no blunting after 14 days of continuous GHRH. Nobody has measured downregulation for BPC-157, TB-500, GHK-Cu, MOTS-c, or the other compounds people ask this about. A forum claim that you must cycle to rest receptors is not a finding unless that measurement exists. Full citations at /cycling.

Full cycling page: what is measured 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.