ghk-cu inhibits 5-alpha reductase dht Figure 3 from inhibitors in the management of benign prostatic hyperplasia : A rationale Attack DHT: A Master Guide

Light Protection: Keep vials away from direct sunlight and strong artificial light sources

Anything less is guesswork

For prescription topical formulations used consistently, initial improvements in texture, hydration, and radiance typically appear at 2 to 4 weeks, meaningful visible changes to firmness and fine lines at 4 to 8 weeks, maximum early results at 8 to 12 weeks, and full cumulative benefit at 3 to 6 months of consistent daily use

Do not store it in the door compartment where temperature fluctuates every time the door opens

Exact shelf life can vary based on specific storage conditions, handling, and the particular peptide batch