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And heres something that doesnt get said enough: hair health is scalp health

If left untreated, vitamin B12 deficiency can cause neurological changes, such as numbness or tingling in the hands and feet

The intranasal GHK-Cu treatment was found to delay cognitive impairment, reduce amyloid plaques, and lower inflammation levels in the frontal cortex and hippocampus .37 Randomized controlled trials in human patients are needed to confirm the benefit of GHK-Cu for cognitive decline and Alzheimers disease as well as to evaluate safe and effective human dosing (the human dose equivalent of 15mg/kg in mice would be ~1.2mg/kg, though data on this or any other dosing nasally in humans is not currently available), but preliminary animal trials are promising

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6) Which form do you usemethylcobalamin or cyanocobalamin