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Recommended amount (mcg): Adults (18 years +) 2.4 During pregnancy (Any age) 2.6 When breastfeeding (Any age) 2.8 Vitamin B12 is a vitamin found naturally in a wide variety of animal foods, and manufacturers add it to some fortified foods
Common side effects are mild: Injection site irritation Mild headache Transient flushing Slight appetite changes Serious adverse effects are uncommon with appropriate dosing and medical supervision
In some cases, the redness may be accompanied by swelling, warmth, and pain
May be taken with or without food
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