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Efficacy of oral compared with intramuscular vitamin B-12 supplementation after Roux-en-Y gastric bypass: a randomized controlled trial
Oral B12 has only about 1 to 2 percent absorption, while injections are absorbed at 55 to 97 percent
The Role of B12 Tablets and Supplements While injections are often necessary for significant deficiencies or malabsorption issues, B12 tablets and oral supplements still play a vital role
Scientific Content Is Informational References to molecular pathways, published literature, experimental models, or research themes are informational and do not establish safety, efficacy, suitability, approval, or a recommendation for any human or animal use
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