Vitamin B12 plays a key role in many bodily functions ... For example, a healthy person taking a 500 mcg oral B12 supplement will only absorb about 10 mcg. Although uncommon, it is possible ...

B12 supplements can come in a variety of forms — spray, liquid, capsule — which can make it difficult to know what to buy. That’s why we asked registered dietitians which ones they’d actually ...

The amount of B12 in supplements can vary widely from 500 micrograms to 1,000 micrograms. “The most important thing when looking at a vitamin B12 supplement is the dosage to ensure that it is ...

If you don't get enough vitamin B12, you might experience adverse side effects like numbness, tingling, and canker sores. B12 shots contain about 100 micrograms of B12, which is roughly 40 times ...

2.8 mcg per day For those who are deficient, doctors may recommend higher doses through supplements or injections. Vitamin B12 is produced by certain microorganisms, that live in the gut ...