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Severe deficiency with neurological symptoms is usually treated with B12 injections rather than oral liquid because injections produce faster correction

Anaemia is a common cause of B12 or folate deficiency where there are fewer red blood cells or a lower amount of haemoglobin, which helps the blood carry oxygen around the body

B12 is a water-soluble vitamin, meaning your body will naturally excrete any excess

Source: O'Leary, F., & Samman, S

A deficiency in vitamin B12 can lead to various health problems, ranging from fatigue to permanent neurological changes

Its found in dairy products such as yogurt, milk, and cheese as well as in meat, fortified cereals, and fish