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Vaccine Administration: Subcutaneous Injections
Because these injections are delivered into the muscle, they are absorbed more directly and predictably than oral supplements
While generally safe, common B12 side effects include diarrhea and swelling at the injection site
Prolonged overdose of B6 (150-200 mg/day) over weeks can cause severe sensory-nervous-system dysfunction and ataxia.37 With normal usage serious adverse effects are not reported for pyridoxine (vitamin B6), however, diarrhoea, emesis and rosacea-like dermatitis may be observed in some cases (38)
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