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This depends on the individual pain tolerance, needle size, injection technique, and injection site
The standard research protocol is 300 mcg per day, subcutaneous, administered in a fasted state, typically in the morning before food or exercise
However, many other places have simplified the process
You need to get it from food or supplements
Vitamin B12 supplementation is available in several forms, including oral tablets, sublingual (dissolved under the tongue) preparations, nasal sprays, and intramuscular injections (commonly known as B12 shots)
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