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The frequency and severity of gastrointestinal symptoms can vary depending on the formulation (tablets, sublingual preparations, or liquid forms), the dose administered, and individual patient factors such as existing digestive conditions or sensitivities to inactive ingredients in the supplement

[PubMed] [Google Scholar] 76.Sobolevski A.I., Zhizhonkov N.V., Bezhenar A.A

Vitamin B12 is made by micro-organisms and is not produced by plants

Q5: Why is injectable Vitamin B12 preferred over oral supplements