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The recommended daily intake of B12 is 2.4 micrograms, but many experts believe the current RDA for vitamin B12 is way too low

Capsules may appeal to patients who want convenience, while injections are often discussed for more direct delivery

B12 also plays a vital role in producing healthy red blood cells that carry oxygen, preventing conditions like megaloblastic anaemia, and is involved in DNA synthesis

Elevated levels of B12 could be indicative of certain health concerns, Vettel says, including: Cancer Diabetes Impaired kidney function Liver disease If you have elevated levels of B12, your doctor may run other tests to determine the underlying cause