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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)
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Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more
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
Not recommended beyond this
