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They are used to quickly elevate the level of B12 as the vitamin goes directly to the bloodstream

Patients should be cautious about unregulated sources online, as purity and dosing can vary widely

Feldman et al stated that the primary role of laboratory investigations

Vitamin B12 injections can cost anywhere from $15 to $100 per shot

Adv Healthc Mater

Why to avoid with MTHFR: Requires multiple conversion steps to become active MTHFR mutations impair these conversions Contains cyanide (though small amount) Least bioavailable form Found in most cheap multivitamins and fortified foods Bottom line: Choose methylcobalamin, hydroxocobalamin, or adenosylcobalamin instead