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Recent evidence suggests that this temporal regulation involves not only the hypothalamicpituitaryadrenal axis but also mesolimbic reward pathways, where circadian fluctuations in monoaminergic neurotransmission (particularly dopamine and serotonin) influence endocrine responses to environmental cues (116, 117)

If you must layer them in the same evening routine, apply the lightweight copper peptide serum first, wait 10 to 20 minutes for complete absorption and pH stabilization, and then follow with your retinol and a nourishing moisturizer

Du H, Guo L, Fang F, Chen D, Sosunov AA, McKhann GM, et al

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