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And this has basis in fact: GHRH, GH, and IGF-1 do affect brain function in older adults

GHK-Cu: Has an affinity to skin cells and acts as a signaling molecule for tissue repair and natural anti-inflammatory responses

Accordingly, HGF and MET play an important role in SC-mediated nerve repair (Ko et al., 2018)

Similar improvements in functional and histological healing have been reported across independent rat ligament- and muscle-injury models, synthesized in a 2025 systematic review

The random term ij represents the random error, which was assumed to be normally distributed, j represents the random effect for patient, and 0 represents the intercept

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