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Glutathione is the primary molecule used in this second phase
Copper sticks to it very tightly, and the copper-bound version is the form most often used in lab and skin-research studies
The doctor performs this test during an acute episode of symptoms
The molecular weight of GHK-Cu sits between 340 and 404 g/mol depending on the salt form, making it a small molecule that distributes efficiently through tissue after injection
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