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B12 injections may help improve memory, concentration, and overall cognitive performance, particularly in individuals with B12 deficiency or cognitive decline associated with ageing
The relationship between dose and response in humans is unknown
The loading dose concept
If you take large doses of vitamin B12 and notice adverse side effects, talk to your health care professional about the issue and ask about evaluating your ability to properly absorb the nutrient
For a 5 mg vial, you might use the entire contents in a single dose or split it into two
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