A recent study estimated that 1 in 5 Americans are at risk for vitamin D deficiency. Vitamin D is a fat-soluble vitamin that is naturally present in a handful of foods (e.g. fatty fish or cod liver oi...

Folic acid is the synthetic form of folate, a water-soluble B vitamin that takes part in several critical functions in the human body. The active form of folate is tetrahydrofolic acid. It serves in o...