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Tablets just as effective Over-the-counter B12 tablets are a fraction of the cost of shots, and have been shown in a British-Canadian study to work just as well for most people, although some people with digestive conditions may have difficulty absorbing the vitamin in tablet form

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Common side effects include mild pain, redness, or swelling at the injection site

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Additionally, those with certain medical conditions or absorption issues may benefit from testing

Vitamin B12 injections are generally considered to be very safe