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More serious deficiencies have the potential to impair heart and neurological function, leading to a wide range of serious symptoms, including but not limited to tinnitus, severe joint pain, memory problems, depression, anxiety, poor muscle function, ataxia and changes in reflexes

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While both are copper peptides, they differ in their primary amino acid: GHK-Cu uses Glycine

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Many labs specify a minimum purity threshold around 98%, and some suppliers such as Protide Health publish batch-specific HPLC data showing 99% purity or higher on their Certificates of Analysis

It's attracted growing interest in research circles because of how directly it targets a specific enzymatic pathway - which makes it a useful tool for studying how NNMT activity influences downstream metabolic signalling at the cellular level