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Common Stomach Side Effects of Vitamin B12 Supplements Although vitamin B12 supplements are generally well-tolerated, some individuals experience gastrointestinal symptoms, particularly when taking oral formulations

This means that they can begin to work much faster than other supplements such as B12 tablets and other medications

Do not double-dose

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Pain, redness, or bruising at the injection site Headache Drooping eyelids (called ptosis), especially when treating forehead lines or frown lines Dry eye or dry mouth More serious side effects are rare but possible

But you can also have a vitamin B12 deficiency without having anemia