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A study in Organogenesis found GHK-Cu reversed over 50% of gene expression changes associated with COPD-related lung tissue damage in cell models
Breathing issue: In extremely rare instances, inhaled forms of glutathione have caused bronchial constriction (tightening of airways)
Transfer into breast milk is the primary concern
Gastrointestinal effects Beyond nausea, the full spectrum of GI side effects includes constipation, diarrhea, bloating, and abdominal discomfort
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