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They are not a prescription, not medical advice, and not a recommendation to self-administer anything
The most chemically complex of all the vitamins, methylcobalamin is a water-soluble, organometallic compound with a trivalent cobalt ion bound inside a corrin ring which, although similar to the porphyrin ring found in heme, chlorophyll, and cytochrome, has two of the pyrrole rings directly bonded
"Biochemical indicators of B vitamin status in the US population after folic acid fortification: results from the National Health and Nutrition Examination Survey 19992000"
Instead, you should use a combination of lifestyle changes, dietary changes, and exercise changes in conjunction with your B12
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