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Psychiatric presentations of vitamin B 12 deficiency

B 12 deficiency can also adversely affect the methylation reaction, increasing inflammatory responses [38], and reducing CD8+ and natural killer cell activity [39]

In contrast, a B12 injection (typically administered into a muscle, known as an intramuscular injection) bypasses the entire digestive system

In addition, the bioavailability of the vitamin B12 ingested depends on the amount delivered in each dose (Domke et al., 2004)

doi: 10.1016/j.cgh.2009.12.022

Low vitamin D levels have been linked with problems such as bone loss and fractures, especially in higher risk groups