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As well, some people may have allergies or medical conditions that do not allow them to be a good candidate to receive vitamin B12 shots, such as kidney problems, low potassium levels, deficiencies in other vitamins such as iron or folic acid, or just an allergy or sensitivity to vitamin B12 itself
Not currently listed on the WADA Prohibited List as of 2026
Pale skin
Extreme fatigue Weakness Tingling in hands and feet Memory problems Difficulty concentrating (brain fog) Pale skin Mood changes What food is highest in B12
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