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Description
According to a study published in PubMed Central (National Institutes of Health), intravenous administration of vitamin B12 provides a faster increase in B12 levels compared to oral supplementation, making it a potentially better option for patients with severe deficiency

Ors, M.M
Cancer Metab

Sometimes the same bacterial issue that causes digestive issues from swallowing the B12 can also cause these heart palpitations, anxiety etc
