Engineered probiotics are on the horizon
Indications and Usage for Cyanocobalamin Cyanocobalamin is indicated for vitamin B 12deficiencies due to malabsorption which may be associated with the following conditions: Addisonian (pernicious) anemia Gastrointestinal pathology, dysfunction, or surgery, including gluten enteropathy or sprue, small bowel bacteria overgrowth, total or partial gastrectomy Fish tapeworm infestation Malignancy of pancreas or bowel Folic acid deficiency It may be possible to treat the underlying disease by surgical correction of anatomic lesions leading to small bowel bacterial overgrowth, expulsion of fish tapeworm, discontinuation of drugs leading to vitamin malabsorption (see Drug Interactions), use of a gluten-free diet in nontropical sprue, or administration of antibiotics in tropical sprue
References Burcelin R, Gourdy P (2017) Harnessing glucagon-like peptide-1 receptor agonists for the pharmacological treatment of overweight and obesity
Zhao JZ, Ruzieh M, Du F, Lian Y, Foy AJ, Platt RW, et al
Thanks Val, theres no test that separates these two situations