However, if you have a low B12 level or a vitamin B12 deficiency, it can cause physical, neurological, and psychological problems
[5] The most scientifically cautious interpretation is not that broad off-target inhibition has been proven, but that broader non-target effects cannot be excluded when experiments use high concentrations, long exposure windows, sensitive cell systems, or designs lacking orthogonal NNMT validation
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Anti-Ageing Biology Research Research has examined GHK-Cu in the context of cellular ageing and senescence, with studies exploring its effects on oxidative stress markers, DNA repair signalling, inflammatory gene expression, and extracellular matrix maintenance in aged cell models contributing to the growing field of peptide-based anti-ageing biology research
In the blood stream as nicotinic acid, it can cause skin flush and this reaction is actually responsible for the tolerable upper limit (UL) for niacin at 35 mg/d for adults in US (20)