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GHK-Cu is a copper-binding peptide complex studied for its relevance to copper-peptide signaling, extracellular matrix research models, collagen-associated pathways, dermatological research contexts, tissue-response environments, and hair-follicle research models

Allowing refrigerated medication to reach room temperature before injection improves comfort

Tsiantas et al., 2021)

Getting it via IV is also effective in bypassing the gut but is cost prohibitive for most

Inhale gently through your nose Wait Between Doses : If applying a second spray to the same nostril, wait about one minute

Marks are less fine (0.1 mL), so it's a bit less precise for small doses