Methionine A sulfur-containing amino acid that acts as a lipotropic agent to prevent excess fat buildup in the liver and the body
Without B12 supplementation, their deterioration may have meant and still means that they would be subjected to countless pricey investigations, scans and procedures, visits to psychiatrists, neurologists, gastroenterologists, and other ologists
3 In B12 deficiency, methylmalonic acid (MMA) can accumulate, and it is thought that elevated MMA, alongside elevated homocysteine, contributes to damage of the myelin sheath (which protects nerve cells and speeds up nerve transmission), which can cause irreversible neurological problems
Am J Physiol Endocrinol Metab
Generally, no harm comes from vitamin B12 injections, which are usually quite safe