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Some people report acne or a flushing sensation after high-dose injections, but that relates to the injection rather than the blood level

You might conclude that GHK-Cu is ineffective for your application, when in reality, you weren't even using active GHK-Cu to begin with

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Modifications in neurotransmitter levels by modulatory pathways such as the kynurenine pathway, and also changes in accessibility and effects of SCFAs in the brain, may have an impact on BDNF activities such as neural survival and CNS development (70)