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In experimental research, the GHK-Cu complex has attracted interest due to its interactions with pathways involved in extracellular matrix regulation, cellular repair mechanisms, and gene expression associated with tissue maintenance

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In rare cases, individuals with reactive airways, including some asthma patients, may experience temporary bronchospasms or airway irritation after glutathione administration

This explains why 2-3 weekly injections produce cumulative collagen synthesis and sustained anti-aging benefits despite rapid peptide elimination

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