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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)
Vitamin B12 deficiencies are therefore quite common among vegetarians and vegans
Overall Health : A persons overall health and the presence of any underlying medical conditions can affect the absorption and utilization of Vitamin B12
Oral Supplements Oral supplements are available for all the vitamins in the B-complex group
Read more about food sources of vitamin B12
Vitamin and mineral supplementation for preventing dementia or delaying cognitive decline in people with mild cognitive impairment
