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These reactions are uncommon, but recognising them early is important so that medical care can be sought without delay

Vitamin B12 injections are generally safe, but some people may experience side effects, such as pain, redness, or swelling at the injection site, mild headaches, dizziness, nausea, or itching

When you take Vitamin B12 through an intramuscular injection, you can process 100% of that vitamin, whereas with an oral supplement, usually only about 50-70% of the vitamin is able to be processed and metabolized

This characteristic allows exploratory evaluation of oral administration, although current data indicate that oral bioavailability is presumed lower than parenteral routes