Although you may eat plenty of B-12-enriched food, your body may not absorb it or use it efficiently due to aging, alcohol intake, and pollutants from the environment, all of which can take a toll on your body and digestion
Solution left out of the fridge Short excursions at room temperature (under 2 hours) are generally tolerable
Macrocytic anemia occurs when your body doesnt have enough normal red blood cells, and can cause symptoms including muscle weakness and paresthesias (paresthesias is the technical term for the pins and needles feeling on your skin)
Since there is no known hazardous threshold for vitamin B12, there is no upper limit
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Some antibiotics, like chloramphenicol, can mess with B12 metabolism