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But hes seen people post about taking what he characterized as silly, silly amounts. Several experts who spoke with Undark expressed additional concerns about the purity of substances purchased from underground websites

If the GHK-Cu has lower-than-stated purity or incomplete copper complexing, the actual administered dose and the active complex differ from the calculated values, compromising research validity

They found significant reduction of SOD activities and serum levels of zinc, copper and manganese in healthy pregnant women compared to non-pregnant women with further reduction in RM patients