As a rule, younger people need less vitamin D than older people, regardless of sex. This article explains average vitamin D ...

Those with low serum vitamin D levels (<30 ng/mL) were nearly 5 times more likely to experience menstrual disorders, including long cycles, oligomenorrhea (infrequent periods) and amenorrhea (absence ...

Despite its importance, roughly 41% of people in the United States have a vitamin D insufficiency. Rates of vitamin D deficiency are higher for women ... increase blood levels of vitamin D ...

However, 800 to 1,000 IU is the dose that may have a better chance of giving a patient a normal vitamin D level. In some countries, vitamin D is listed in micrograms, and the relationship is as ...

Vitamin D is important for healthy bones, teeth, and immune function but, as it is said, excess of anything can lead to ...

A 2022 national survey found that 13.5% of U.S. adults said they felt “very tired” or “exhausted” most days or every day over ...

with appropriate vitamin D levels than in women with lower vitamin levels, according to research. If your vitamin D levels aren't within normal ranges, you may experience issues if you're already ...

Previously, the Endocrine Society defined vitamin D levels in terms of "deficiency" and "insufficiency" based on serum 25-hydroxyvitamin D (25[OH]D) levels. However, the new guidelines no longer ...

Vitamin D supplementation for postmenopausal women and older men — given that those populations had normal vitamin D levels, no previous fractures, and no issues with bone density — was found ...