multiple sclerosis and b12 injections If Vitamin Deficiency Mimics Sclerosis, How do you tell the Difference? 9 Best Vitamin B12 Supplements
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It is administered only by a licensed healthcare professional

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However, if you are sensitive to methylated nutrients or already reacting to supplements, starting with single-ingredient B12 may be safer before introducing a full B-complex

Practically yes, vials only hold about 3mL safely, and beyond that you risk overflow
