Medically reviewed by Soma Mandal, MD A vitamin D test measures your blood's vitamin D levels to see if they are too high or too low. Low vitamin D levels can increase your risk of bone disease and ...

How to check your levels and boost them if they're lowSix ounces of salmon supplies twice the amount of vitamin B12 an adult needs daily.By Alexandra FrostVitamin B12 is found only in animal ...

We tested the best vitamin deficiency tests from LetsGetChecked, Everlywell, and LabCorp, and our testers found them easy to use and informative. Learn more about the best vitamin deficiency tests ...

Answer these questions to find out if you should consider taking a multivitamin. On most days, do you: Eat six to 11 servings of grains (breads, cereal, rice, pasta and other grain foods)? One serving ...

A new study found that taking a multivitamin could help slow cognitive decline that's associated with aging by as much as two years. A study led by researchers at Mass General Brigham and published in ...