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Vitamin B12

What it’s good for
Vitamin B12 helps maintain healthy nerve cells and red blood cells and is also needed to make DNA, the genetic material in all cells.

Where to find it
Shellfish, beef, salmon, yogurt, tuna, eggs, milk, chicken.

How to take it
Recommended dosage for adults: 2.4 mcg a day

The Institute of Medicine of the National Academies states that no adverse effects have been found in taking an excess of vitamin B12.