Similarly, copper peptides and retinol may cause irritation if used together without proper spacing
The following considerations further strengthen the criticism toward the use of PAC as a safer alternative to NSAID: PAC has been preferred to NSAIDs and steroids for the symptomatic and domiciliary management of the early stages of COVID-19, a choice grounded of the precautionary principle (but still theoretical in this specific case) principle primum non nocere (Micallef et al., 2020a)
Blundell J, de Graaf C, Hulshof T, Jebb S, Livingstone B, Lluch A, et al
A 2025 study published in Frontiers in Pharmacology examined GHK-Cu's effects in a colitis model, finding that it modulated SIRT1 and STAT3 signaling in colon tissue a reminder that this peptide's research footprint extends well past skin and hair into broader inflammatory and metabolic pathways
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