Most adults need at least 15 micrograms (mcg)—or 600 international units ( IU)—of vitamin D daily to maintain healthy levels. The amount recommended for children and older adults depends on age.

Learn about normal vitamin D levels by age. This article also looks at sources of vitamin D, symptoms of vitamin D toxicity, and more.

Vitamin D and cholesterol share a complex relationship. While vitamin D may help lower cholesterol levels, some studies suggest vitamin D can actually raise them.

You need a sufficient amount of vitamin D to help your body keep normal calcium and phosphorus levels, Zeratsky says, because these three nutrients work together to build and maintain your bones.

Patients with gastroparesis and low vitamin D levels showed higher gastric retention of a solid, low-fat meal at 4 hours than those with normal vitamin D levels (36% retention vs 31% retention; P ...

Similarly, surgical patients with low Vit D levels also healed slower than their normal Vitamin D counterparts clinically (83.0 vs. 50.0 d, p=0.031) and radiographically (203.0 vs. 88.0 d, p=0.043).

There’s really no need for most people to supplement with more than 600 to 800 IU per day, but if you are deficient and having a hard time getting your vitamin D level up to a normal range, it ...

Vitamin D affects how your immune system works, and plays a role in controlling certain types of inflammation, including the type that leads to autoimmune diseases.It’s common for people with lupus to ...

"Many Americans are deficient in vitamin D due to limited sun exposure from indoor lifestyles, sunscreen use and our northern latitude," Thomason says. "Plus in Northern America, our typical diet is ...

A 1.0-unit decrease in serum vitamin D levels was associated with an obstructive AHI increase of 0.7 (95% CI 0.04-1.40), they wrote in JAMA Otolaryngology–Head & Neck Surgery. "If further ...