The standard route in research community use and in most published guides
Eat a Light Meal: While not strictly required, having a light snack before your appointment can help prevent any feelings of lightheadedness if you are sensitive to needles
The NHS schedule for treating B12 deficiency is a loading dose of 1mg hydroxocobalamin by intramuscular injection every two to three days for two weeks, then a maintenance dose every two to three months for life when the cause is non-dietary
This article reports what has been documented, not what should be done
Perhaps most notably, the researchers observed no adverse effects even at high doses
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