Peptides for Stress Research

2 research peptides are currently studied for stress research. This guide ranks them by evidence strength and covers their mechanisms, safety profiles, and current clinical status.

Evidence Rating: B

Category: Neuropeptide / Reference

Neuropeptide Y (NPY) is a 36-amino-acid peptide (MW ~4271.7 g/mol) that is one of the most abundant and widely distributed neuropeptides in the mammalian brain. It is a potent orexigenic (appetite-stimulating) peptide and plays critical roles in energy homeostasis, stress response, anxiety regulation, circadian rhythms, and cardiovascular function. NPY acts through a family of G-protein-coupled receptors (Y1, Y2, Y4, Y5). It is an endogenous reference molecule and a major drug target, not a therapeutic agent itself.

Key claims: Most potent endogenous appetite stimulant; Key regulator of stress and anxiety.

Evidence Rating: D

Category: Stress / CRF Antagonist

Astressin-B is a synthetic cyclic peptide antagonist of corticotropin-releasing factor (CRF) receptors, originally developed for stress-related research. It gained viral attention after a 2011 Salk Institute study showed that a single injection reversed hair loss in chronically stressed mice. The hair regrowth finding was serendipitous — the study was designed to investigate stress-related GI effects. Despite enormous public interest, no human clinical trials for hair growth have been conducted, and CRF antagonists have a troubled clinical development history for psychiatric indications.

Key claims: Reverses stress-induced hair loss in mice; Blocks CRF-mediated stress response.