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you are not consuming enough of it through your diet, or your body is unable to absorb the supplement
Here are some side effects to watch out for: Reactions at Injection Site Redness, swelling, or irritation may occur at the injection site, especially with repeated use
But, how often depends on how bad the deficiency is and how well theyre doing
However a vegan diet contains almost no sources of B12, which increases the risk of deficiency
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