Casterline JE, Allen LH, Ruel MT
The two active forms of B12 used by the body are methylcobalamin and adenosylcobalamin, both of which can be produced from hydroxocobalamin
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Mild side effects may include slight redness or tenderness at the injection site, but these usually resolve quickly.
In the UK, vitamin B12 deficiency is relatively common, particularly among older adults, vegans, vegetarians, and individuals with certain gastrointestinal conditions that impair absorption, such as pernicious anaemia or Crohn's disease