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doi: 10.1186/s12953-018-0131-y 42

Shel Wellness & Aesthetic Center. Who Can Benefit From Peptide Therapy With GHK-cu GHK-Cu is a copper-binding tripeptide naturally found in the body and widely used in skincare and aesthetic programs for skin renewal and rejuvenation

The underlying deficit matters too hair follicles need direct scalp exposure plus enough protein and calories to grow

The difference is that the topical claim has supporting human cosmetic studies behind it, while the injectable skin claim has mechanism plus animal data and nothing more

I'm saying the conversation should start with the science and not end with fear

These mechanisms include complex biological cascades that are specific to the applied stimulus and employ both neuronal as well as glial pathways (for review, see Thushara Vijayakumar et al., 2016)