arm sore after b12 injection a Meningitis Vaccine? You May Have SIRVA Delayed Arm Rash, Soreness After
Description
2020;19(6):e13124

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Published preclinical data in rodents suggests doses equivalent to 200mg+ in humans produce off-target effects on folate metabolism and S-adenosylmethionine (SAMe) pools

It's readily available for cellular use and may be preferable for individuals with certain genetic variations or specific health conditions