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However, some rare side effects of too much vitamin B12 can include: Headache Weakness Nausea Diarrhea Tingling sensations in the hands and feet Allergic reactions or skin rash (uncommon) When To Seek Medical Advice Risk of vitamin B12 deficiency: Groups at a higher risk of vitamin B12 deficiency include older adults, people who only eat plant-based foods (vegans and vegetarians), and those with certain chronic conditions (gastrointestinal disorders that can affect vitamin absorption)
The dose is 1000 mcg (1 mg)
Kathleen Grant, Ph.D., Senior Scientist, Oregon National Primate Research Center
Some users prefer injecting before fasted cardio to enhance fat oxidation
The surgical and hospital staff know her well
Pernicious anemia is caused by a decrease in red blood cells when the body cant absorb enough vitamin B12, greatly raising the risk for neurological complications
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