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Culture media from 24-hour incubated cells were collected, stored at -80 C, and analyzed for urea concentration using LC/MS/MS API3000, normalized to total cell protein

However, measuring cytotoxicity alone is not sufficient

Additionally, DSIP attenuates ACTH and corticosterone release in response to stress, indicating an effect on the hypothalamic-pituitary-adrenal axis [8]

This means GHK-Cu doesnt just add collagen it rebalances the entire collagen remodeling system, which more closely mimics youthful tissue biology

Instead, it appears to modulate the neurochemical environment that makes deep sleep physiologically possible

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