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BPC-157 vs TB-500 and GHK-Cu BPC-157 vs TB-500 and GHK-Cu In-Depth Comparison & Synergy Guide Introduction: Introduction: BPC-157, TB-500, and GHK-Cu each offer unique tissue-healing benefits
[28] Fukumoto, S., Ito, M., Kunitomo, H., Hataoka, T., Chiba, T., Nureki, O., & Fujimoto, T

doi: 10.21101/cejph.a7796

This means you need concentrations that support single-draw dosing at these levels

A practical approach is to apply GHK-Cu in the morning after cleansing and before sunscreen, and use a retinoid at night
