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There are several ways to increase B12 levels, but not all methods work the same for everyone
arXiv preprint arXiv:math/0603291
Allergic reactions to proprietary preparations of vitamin B12 might be due to substances added to the solutions as preservatives or for other reasons, to impurities from the production, or to the vitamin B12 itself
People describe symptoms in many different ways, making it difficult to systematically compare social media posts with standardized medical terminology from the Medical Dictionary for Regulatory Activities (MedDRA), which clinicians use to classify symptoms
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