doi:10.1002/ptr.4864
Below is focused detail on top studied candidates, how they act, who is showing the most promise, and a compact summary table of targets and reported effects
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The four primary mechanisms are: signaling the hypothalamus to suppress hunger, slowing gastric emptying so fullness lasts longer, stimulating insulin release after meals to prevent blood sugar spikes, and suppressing glucagon to reduce glucose release from the liver
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According to the same PMC/NIH review, topical GHK-Cu applied to thigh skin over 12 weeks improved collagen production in 70% of participants, compared with 50% for a vitamin C cream and 40% for retinoic acid in the same study a comparison that helped cement GHK-Cus reputation as a serious subject of dermatological research