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Vitamin B12 is available as a dietary supplement in various forms, including pills, sublingual tablets (that dissolve under the tongue), injections, and nasal sprays
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Optimal Absorption Compared to Oral Supplements Compared to oral supplements, B12 injections offer optimal absorption

doi: 10.3389/fphar.2015.00181 37 MeyerCTWootenDJLopezCFQuarantaV

[DOI] [PubMed] [Google Scholar] 62.Hill D.E., Yeo R.A., Campbell R.A., Hart B., Vigil J., Brooks W
