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)
While some vitamins last just a few days, others, like vitamin D, can stay in the system for months
Fish and seafood represent another category of B12-rich foods, though generally less concentrated than liver
B12 injections may be worth discussing if you are experiencing fatigue, low energy, brain fog, or a lack of motivation while trying to lose weight
And understanding how supplements affect your skin is part of empowering you to make informed decisions
Additionally, it plays a key role in nerve function and the production of DNA and red blood cells