Vitamin B12 overdose is so rare that serious adverse effects from consuming large amounts of vitamin B12 have only been reported in a handful of studies in the medical literature. It’s effectively ...

Vitamins and minerals help your body function at its best. But too much or too little of a particular nutrient can sometimes cause problems. Take a fluttering heartbeat, for example. Though rare, ...

People who don’t get enough vitamin B12 through their diets may need a supplement to fill the gap. Here’s how much to take.