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The well-known geriatrician-haematologist Larry Solomon, working at Yale University in the USA, wrote 20 years ago: if I had treated only those people who actually had too low serum B12 and elevated MMA values, then I would not have treated approximately two-thirds of the people with a favourable response to B12 supplementation (note: partly via injections, partly via oral supplementation)

B12 shots are generally safe as long as proper precautions are taken for the injections

Vitamin B12 is a water-soluble vitamin , meaning any excess is usually excreted through urine rather than stored in the body

Red blood cells carry oxygen to every part of the body