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In thyroid cancer, various selenium supplements have shown variable anticancer activity

10.1038/s41564-018-0337-x 136

Reported or plausible effects can include local irritation, redness, swelling, or discomfort at the application or injection site, as well as headache, nausea, dizziness, flushing, or fatigue

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GHK-Cus copper-chelating activity and its role in endogenous tissue homeostasis have made it a research subject in multiple fields, including wound-healing biology, skin fibroblast pharmacology, and antioxidant pathway studies

Adjust dose based on response and tolerance