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Also, some people have trouble properly absorbing the nutrient because of issues involving the GI tract or lack of stomach acid
Vitamin B12 deficiency has occurred in breast-fed infants of vegetarian mothers whose diets contain no animal products (e.g., eggs, dairy), even though the mothers had no symptoms of deficiency at the time
Oral B12 supplements often contain higher levels than the recommended daily allowance (RDA)
The injections are given intramuscularly, or into muscle
The preferred way to test B12 status is also to check your methymalonic acid (MMA) level
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