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In the body, it is transformed into both bioactive coenzyme forms: methylcobalamin and adenosylcobalamin

Pernicious anaemia, a condition marked by the deficiency of vitamin B12 due to the inability of the body to absorb it, necessitates lifelong treatment to manage symptoms and prevent complications

Vitamin B12 deficiency can cause hair loss, and supplementation can support new hair growth

Taking a proton pump inhibitor or other medications that reduce stomach acid for reflux or ulcers, as well as taking metformin for diabetes, can reduce absorption of B12 in food or supplements

However, in very rare cases, some people can experience side effects caused by allergic reactions or sensitivity ( If you experience any side effects, speak with your doctor

You may need a blood test for vitamin B12, B vitamins, and other nutrients