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In neuronal senescence model studies, the active ingredient of the product can cross the blood-brain barrier (and act directly on neurons in vitro), increase NAD+ levels in nerve cells, protect mitochondrial function, reduce neuronal apoptosis, and promote the synthesis and release of neurotransmitters (such as dopamine and acetylcholine), thereby improving signal transduction in nerve cells
Even the angle at which you introduce water into the vial can determine whether you end up with fully functional GHK-Cu or an inactive solution of broken peptide fragments
These are experimental patterns
Alternatively, they may be deficient in B12 for other reasons
Repletion plan (scheduled): low B12 or recurring fatigue set a cadence (weekly/bi-weekly/monthly) and adjust based on how you feel and any labs