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High-performance liquid chromatography (HPLC) and enzyme-linked immunosorbent assay (ELISA) were employed to quantify the levels of these key neurotransmitters and neurotrophic factors

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While GH deficiency can cause hair problems, supplementing GH in normal individuals does not reliably improve hair growth

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Human clinical trials of systemic GHK-Cu administration remain extremely limited, representing a critical knowledge gap requiring investigation before systemic therapeutic applications can be appropriately evaluated

Decision framework for compromised peptides Definitely discard if: visible precipitation, significant color change, unusual odor, reconstituted solution left at room temperature more than 4 hours, or lyophilized peptide at warm temperature for more than 2 weeks