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GHK-Cu is widely studied for its ability to stimulate collagen synthesis, activate fibroblasts, and support angiogenesis signaling, which helps improve blood flow and nutrient delivery to tissues

While it can help support the skin's defense against sun damage, it is not a replacement for sunscreen

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For instance, they can boost insulin production, which aids in controlling blood glucose levels and preventing the storage of extra glucose as fat

Some protocols might also use intramuscular injections (into muscle), though subcutaneous is more common due to better tolerability