Many foods are fortified with artificial vitamin B12, such as non-dairy milks and cereals, but these are not always optimally absorbed, so vegans must still be proactive about making sure they are not becoming deficient
The standard schedule is a starting point, not a strict rule The 2024 NICE guideline NG239 on B12 deficiency in over 16s makes an important point: the optimal route, dose and frequency of B12 replacement have never been firmly established, and have often followed custom and historical practice
Diarrhoea (defined as three or more loose or watery stools per day) is an uncommon side effect of vitamin B12 supplementation , though it is listed as a rare or uncommon adverse reaction in the official product information for both oral cyanocobalamin and injectable hydroxocobalamin preparations
Vitamin B12 is essential for energy production, red blood cell formation, neurological function, and metabolism
Lucas says