Medically reviewed by Soma Mandal, MD A vitamin D test is a blood test that measures the level of vitamin D (calciferol) in ...

New research finds that taking a daily vitamin D supplement may help lower blood pressure, especially for older adults with ...

The Vitamin D Blood Test (25-OH Vitamin D): Who, How, When, and Where Clinically speaking, things began to change in the 1970s when the blood test for vitamin D (known as the "25-OH vitamin D ...

After discovering I was vitamin D deficient, I started religiously taking supplements, and I've never felt better.

By staying alert to skin symptoms and knowing what to look for you can take the first steps toward addressing a potential ...

The A1C level test can give false or inaccurate results in some people. Doctors say your A1C level can be falsely elevated ...

Vitamin C supports our immune systems, helps our bodies heal wounds, protects our joints and contributes to collagen ...

Vitamin D, also known as the "sunshine vitamin," does much more than strengthen bones; it can support the immune system, lift ...

Growing up, I was told to drink orange juice when I had a cold because "vitamin C is the cure." Does vitamin C actually help ...

Vitamin D supplementation may help manage hypertension, particularly in older adults with overweight or obesity, a new study ...

High levels of vitamin C can interfere with multiple kinds of medications and results of certain medical tests such as blood ...