does ghk-cu cause tolerance or reduced efficacy over time Frontiers Effect of GHK-Cu, CuSO4, GHK+CuSO4,
Description
It was on a continuum with it being most acute in the winter both from my winter diet as a child and winters are hard on the body
Vitex agnus castus essential oil and menopausal balance: a research update [Complementary Therapies in Nursing and Midwifery 8 (2003) 148-154]

Introduction Cellular health depends on efficient energy production, DNA repair, and metabolic balance

It depends on which peptides we use, your specific health goals, and your body's own biology