There are two forms of vitamin D in the blood: 25-hydroxy vitamin D, or calcidiol, and 1,25-dihydroxy vitamin D, or calcitriol. Tests will measure the amount of 25-hydroxy vitamin D in the blood. This ...

Some vitamin D tests may give misleading results despite progress made in recent years to improve the quality of these assays, according to the US Centers for Disease Control and Prevention (CDC).

Low vitamin D levels may affect your sex drive by influencing hormones, mood, energy, and blood flow. Learn how vitamin D deficiency affects libido and whether supplements can help.

How to use an at-home vitamin deficiency test For any further questions, all reputable at-home tests will have instructions and a customer care line. Most vitamin deficiency tests require a blood ...

Physicians are frequently ordering the wrong test for vitamin D levels, and two advocates are calling for closer observation and better IT utilization to solve the problem. An article in the January ...

It's Wellness Wednesday, and this week’s focus is on vitamin D and its role in overall health. Many people assume they’re getting enough during the summer months, but that’s not always the case. We ...

In a recent study posted to the medRxiv* preprint server, researchers determined the impact of vitamin D status in preventing all-cause acute respiratory infection (ARI) and severe acute respiratory ...

Vitamin D supplements are among the most widely used in the United States, especially among people who don’t get enough sunlight or vitamin-D-rich foods. Health experts say daily supplementation can ...

Lauren Silva, a freelance writer in New York City, believes in feeling good in your body and making that experience accessible to everyone across generations. The proof is in her ever-piling browser ...

Serum vitamin D levels are significantly lower and the prevalence of vitamin D deficiency is significantly higher in patients with ulcerative colitis (UC) compared with controls, although a causal ...

Vitamin D has long been known as an essential nutrient for strong bones and teeth, but in recent years it has gained a new reputation as a "longevity" vitamin because of its wide-reaching role ...