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Vitamin B12 in the injectable form provides a direct and concentrated route to supply the body and a preferred route for older populations when normal absorption rates decrease with age
Page MJ, Shamseer L, Tricco AC (2018) Registration of systematic reviews in PROSPERO: 30,000 records and counting
Correlation between intestinal flora and GLP-1 receptor agonist dulaglutide in type 2 diabetes mellitus treatment-A preliminary longitudinal study
Capsules are convenient but require more pills to reach therapeutic doses
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