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Doklady Biological Sciences, 474(1), 106-109

The answer: it depends and everything we know comes from animal models

asthma (as distinct from allergic asthma listed above under "Allergic States"), hypersensitivity pneumonitis, idiopathic pulmonary fibrosis, acute exacerbations of chronic obstructive pulmonary disease (COPD), and Pneumocystis carinii pneumonia (PCP) associated with hypoxemia occurring in an HIV (+) individual who is also under treatment with appropriate anti-PCP antibiotics

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Gollnick H, Altmeyer P, Kaufmann R, Ring J, Christophers E, Pavel S, Ziegler J

Timing of Application: Many researchers find applying GHK-Cu in the evening beneficial, aligning with the skins natural repair cycles during sleep