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While generally safe, common B12 side effects include diarrhea and swelling at the injection site

When high doses of vitamin B 12 are given orally, only a small percentage can be absorbed, which may explain the low toxicity (4)

Avoid sustained direct UV or strong visible light

Should I stop taking B12 supplements if I have side effects

Pregnant and breastfeeding women: The requirement increases to 2.6 mcg per day

Vitamin B12 deficiency tests were therefore relatively uncommon among doctors for a long time and only in the last 15 years or so has B12 deficiency received more medical attention due to numerous studies