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This is especially useful for people with B vitamin deficiencies who may feel tired or fatigued throughout the day
To help bypass any barriers to absorption in the GI tract, many healthcare providers recommend B12 injections for deficiency, but research shows that very high doses of oral B12 (1,000 to 2,000 mcg once a day) can normalize serum B12 levels to a similar extent with minimal side effects
However, conventional oral B12 supplements, such as cyanocobalamin and methylcobalamin, face significant challenges during their transit through the GI tract (23)
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