For example, 3,000 IU of vitamin A (as retinol) is 900 mcg RAE. About 18,000 IU beta carotene, which is less potent than ...

The ideal dose of vitamin B12 varies based on your sex, age, and reasons for taking it. This article examines the scientific evidence behind recommended dosages for B12 for different people and uses.

Know your daily vitamin need and learn more about vitamin sources, its functions and symptoms of its deficiency.

It is common for people over the age of 65 to have a vitamin D deficiency. Read on to learn why that may be, how to supplement vitamin D, and more.

Avoid taking Vitamin D at night as it can disrupt the sleep hormone. Simultaneously, Vitamin D should be consumed with fatty foods for better absorption.

Confused about how much of a vitamin you should take? Learn how to interpret measurements like Recommended Dietary Allowance or Daily Value.

Vitamin D is a critical nutrient that impacts countless areas of life. From bone and teeth support to muscle function, reducing inflammation, and regulating calcium absorption, it provides cross ...

The 2.4 mcg of B12 that is fine for most people is totally inadequate when it comes to pernicious anemia. Low vitamin B12 can have neurological and psychiatric manifestations.

600 IU of vitamin D is the recommended dosage for adults. Taking too much vitamin D could result in nausea, weight loss, disorientation and heart rhythm issues.

Vitamin D supplements may have other benefits, but in otherwise healthy folks with sufficient levels of the nutrient, "our findings do not suggest benefits of long-term moderate- or high-dose ...