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The wide range reflects variability in absorption, individual antioxidant burden, and metabolic demands across different patient populations

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For systemic benefits tissue repair after injury, neuroprotection, or anti-inflammatory effects injectable GHK-Cu delivers superior bioavailability and more predictable plasma concentrations

Similarly, people with digestive issues like celiac disease might find it difficult to absorb vitamin B12, necessitating higher dosage

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However, this research is preliminary and limited to small studies