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On the enzymology of amino acid transport: transport in kidney and probably other tissues is mediated by a cycle of enzymic reactions involving glutathione
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In a separate head-to-head comparison, GHK-Cu outperformed both retinol (vitamin A) and vitamin C in improving skin firmness and elasticity, and it did so without the irritation, photosensitivity, or adjustment period associated with retinoid use
Recent clinical research continues to support the use of growth hormone-releasing hormones like Sermorelin for age-related hormone decline: A 2019 study in Growth Hormone & IGF Research found that GHRH analogs effectively stimulate growth hormone production with a favorable safety profile compared to direct growth hormone administration
Neither is universally "better." The right choice depends on the injury type, location, chronicity, your budget, and whether you value convenience or concentrated local delivery
Some people notice an energy or clarity lift from NAD+ within a short window, while peptide driven repair and skin changes tend to build gradually over weeks
