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The recommended dietary allowance for Vitamin B12 in people over the age of 14 is 2.4 micrograms (mcg)

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Subcutaneous B12 administration, although promising in select cases such as congenital cobalamin disorders, lacks comprehensive comparative studies against IM and oral routes

According to the National Institutes of Health (NIH), no Tolerable Upper Intake Level (UL) has been established for B12, indicating that the risk of harm from high doses is low [*]

They are used to treat conditions such as heartburn, peptic ulcers or gastroesophageal reflux disease (GERD)