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Low levels have been associated with increased feelings of anxiety, irritability, and low mood

This can increase how much is absorbed by up to 7 times compared to formats that are not encapsulated

Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in your stomach, called the intrinsic factor

The most significant interaction involves other glucose-lowering drugs

Possible side effects include: Pain or redness at the injection site Mild nausea Headache Dizziness Skin rash Allergic reactions (rare) Seek immediate medical attention if you experience swelling, difficulty breathing, or other signs of a severe allergic reaction