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According to a study published in Frontiers in Pharmacology, intramuscular administration of vitamin B12 produces a faster increase in serum levels compared to oral routes, although both methods are effective in restoring normal cobalamin levels in patients with deficiency

Supplements Vitamin B 12 is available over-the-counter as a single-nutrient supplement and also as a component of multivitamin and vitamin B-complex supplements (129)

(4) Most of what a total B12 assay measures is bound to haptocorrin and is not available for uptake by most cells

[39] The elderly are at increased risk because they tend to produce less stomach acid as they age, a condition known as achlorhydria, thereby increasing their probability of B 12 deficiency due to reduced absorption

However, there is no conclusive evidence that taking these nutrients can support weight loss