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A Nature Scientific Reports 2016 study showed GHK-Cu had no cytotoxicity to human keratinocytes at concentrations up to 5,800 M over 72 hours and did NOT induce inflammatory biomarkers (IL-1, IL-8, HSPA1A, FOSL1) unlike other copper compounds, concluding GHK-Cu has a low potential of inducing skin irritation
Lactobacillus Salivarius REN Inhibits Rat Oral Cancer Induced by 4-Nitroquioline 1-Oxide
Nutrition 22, 830844
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Possible causes include pregnancy, excessive caloric restriction, body fat dropping below the threshold for menstruation (typically 18% to 20%), or changes in ovulation timing
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