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In 2003, the famous Ralph Carmel wrote in the New England Journal of Medicine: The administration of folic acid can mask the megaloblastic anaemia caused by cobalamin deficiency

Medically unexplained symptoms

Data from: 2020 anti-doping testing figures

Yet a nasal spray product will typically arrive prepared in a metered spray bottle for researchers to use right away

The relationship between food intake and B12 supplement absorption depends on the formulation type and the individual's digestive health

A B12 injection bypasses the digestive system, quickly raising levels in individuals who may struggle with low mood due to deficiency