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Stultz C

doi: 10.1038/s41598-021-85512-y 72 MaybinJAMurrayAASaundersPHiraniNCarmelietPCritchleyH

doi: 10.1016/j.aqrep.2024.101997 108

Research published in Toxicology and Applied Pharmacology found that copper supplementation above 10mg daily (roughly 5 the RDA) can disrupt zinc homeostasis and trigger oxidative stress in hepatic tissue

Specifically, copper(II) complexes absorb light in the red-orange region (~600-700 nm) and transmit/reflect blue wavelengths, which is the same fundamental chemistry that gives copper sulfate its blue color

Researchers look at the ratio between these two to measure how stressed your cells are (PMC Review)