Certain medications can interfere with vitamin B12 absorption or metabolism, potentially leading to abnormal B12 levels in the blood, especially in cases where the body does not absorb or utilise B12 properly
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Other serious side effects can include dizziness or lightheadedness, swelling in the feet or ankles, severe shortness of breath or wheezing, chest pain or a fast heart rate, and bright red blood in the stools
Vitamin C in extremely high doses (more than 1000 mg taken with a b12 supplement) may reduce b12 absorption when taken together