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Furthermore, a 2024 stability study by the International Journal of Cosmetic Science found that 23% of commercial ghk cu peptide acne serums lost over 40% of their active peptide content within 90 days of storage at 25C, highlighting quality control challenges

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For metabolism of NR, NRK1 is expressed in most tissues but is absent in the spleen and white adipose tissue, while NRK2 is only present in skeletal muscle, heart, and white adipose tissue (WAT) 40

BPC-157 is primarily investigated in injury and tendon-related models, whereas GHK-Cu has a much broader research profile involving collagen biology, extracellular matrix remodelling, wound healing, skin physiology and gene regulation