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GHK-Cu Product Features: Within 0-500M (0-200ppm), GHK-Cu has no toxic effect on cells and is safe

In a 2015 review in BioMed Research International , Pickart, Vasquez-Soltero and Margolina collated Connectivity Map data showing GHK modulates expression of roughly 31 percent of profiled human genes in cultured fibroblasts

High histamine foods list: If you are considering a low histamine diet, I find this histamine food list to be the most thorough: Complete list of foods that are high in histamine (pdf)

And protein still needs to be met consistently, especially for us intermittent fasters who want to protect muscle health, metabolism, and physical performance