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If you take a daily B12 supplement or multivitamin and your levels are mildly elevated (900 to 1,200 pg/mL), the most likely explanation is the supplement
Vitamin d deficiency and its association with thyroid disease
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Benefits of Vitamin B12 Injections Increased Energy Levels Vitamin B12 is known for its energy-boosting properties
Precautions General Doses of vitamin B12 exceeding 10 mcg daily may produce a hematologic response in patients who have a folate deficiency
Always follow the proper mixing ratios for your specific vial
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