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GHK-Cu can potentially be useful in providing a safe delivery of copper through the skin to exert its beneficial effects

I have heard that there may be a pill that I could take instead

Best tests to determine B12 deficiency & need Methylmalonic Acid (MMA) Homocysteine Active B12 (Holotranscobalamin - holoTC) If both the MMA and Homocysteine test results are high, then you may not be getting enough B12 intracellularly (even if your blood serum tests show B12 as high) Unfortunately most medical professionals test for B12 sufficiency using a blood serum test

Impairment of the intestinal barrier is evident in untreated but absent in suppressively treated HIV-infected patients