Medically reviewed by Jonathan Purtell, RDN Vitamin B12 helps your body make red blood cells, produce energy, and keep your ...

Dear I.F.: The DV (a replacement for what we used to call the recommended daily allowance, or RDA) for vitamin B12 is 2.4 mcg ...

The best vitamin B12 foods include clams, liver, and trout. Fortified foods, such as cereals and nutritional yeast, are plant-based alternatives. Learn more here.

The RDA is really a recommended minimum rather than a daily allowance, but your body is still unlikely to absorb most of a high-dose B12 supplement, so you’ll end up excreting much of it.

The recommended dietary allowance (RDA) for vitamin B12 for people over 14 is 2.4 micrograms (mcg). However, you may need to take more or less, depending on your age, lifestyle, and specific ...

A study shows that 5 g of nori per day improves vitamin B12 status in vegetarians, suggesting nori as an effective dietary source of this essential nutrient.

Many vitamin B12 supplements contain much more of the vitamin than the body needs. No research has yet found any side effects from taking too much vitamin B12. Learn more here.

Shouldn’t there be warnings about exceeding the RDA by so much? A: Vitamin B12, or cyanocobalamin, is water-soluble, and reports of toxicity are extremely rare.

This output translates to approximately 4,555 grams of active vitamin B12 per year, meeting the recommended dietary allowance (RDA) for over 13.8 million children aged 1–3.

Vitamin B12 is an essential nutrient your body can’t make, so you must get it from your diet or supplements. Here are 12 foods that are high in vitamin B12.