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What survives that test is narrower and more testable than the broad claim it replaces: that brain-penetrant agonism, delivered early, in patients chosen by their biology rather than their diagnosis, and judged against biomarkers rather than questionnaires, might still work
Independent replications largely failed
GHK-Cu delivers it in a controlled, bioavailable form rather than as free copper ions, which can cause oxidative damage
Low collagen levels translate to slower rejuvenation of skin, hair, and nails
Hormones, particularly estrogen, also play a significant role by influencing fat storage and the elasticity of connective tissues
It means the therapeutic threshold for perceptible appetite suppression is higher in the context of greater body mass
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![L-Carnitine contents in foods (modified from [70])](https://www.researchgate.net/publication/377831689/figure/tbl3/AS:11431281221192122@1706708449981/L-Carnitine-contents-in-foods-modified-from-70_Q320.jpg)
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