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In certain regions of the world, marginal or subclinical vitamin B 12 deficiency may be fairly common in other age groups as well, including children, premenopausal women, and pregnant women, primarily due to low intake of animal-source foods (reviewed in 5)
Whilst B12 plays a vital role in energy metabolism, supplementation does not promote fat loss in individuals with normal B12 levels
The condition can be reversed by taking oral vitamin B 12 supplements and adding foods containing B 12
For researchers using oral capsules, taking the compound 30 to 60 minutes before meals in a fasted state may enhance fat oxidation effects, though this recommendation is based on theoretical considerations rather than controlled studies