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Healthline notes that another side effect of too much vitamin B12 is the development of a rare and slow-growing blood cancer known as "polycythemia vera" (PV)
Alternative supplementation methods such as patches or oral supplements are available for obtaining adequate vitamin B12 levels
Mono-therapy with subcutaneous injections of methyl B12 is not a preferred protocol to successfully treat autism
Those who have had bariatric surgery or have malabsorption issues might need special dosing plans
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