Vitamins & Supplements

What is Vitamin D?
Vitamin D is a fat-soluble vitamin that is often referred to as the sunshine vitamin because it is formed in the body by the action of the sun's ultraviolet rays on the skin.

What does Vitamin D do?
Vitamin D plays a pivotal role in nutrition by facilitating the absorption of calcium, thereby helping to support healthy and strong bones. It also is an important nutrient for promoting bone mineralization in concert with a number of other vitamins, minerals, and hormones.

Why should I take Vitamin D?

"We all need this fat-soluble vitamin to absorb and use calcium properly. Your body produces vitamin D when exposed to sunlight. Yet, research shows that many people(especially seniors and dark-skinned people) are deficient in vitamin D, so I encourage everyone to supplement."
Andrew Weil, M.D.

Find out if supplemental vitamin D is right for you – get your free personalized recommendation from Dr. Weil's Vitamin Advisor.

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Weil Nutritional Supplements are based on stringent scientific research. Current, valid studies (published in peer-reviewed scientific journals) are the basis of our formulations, and all products are designed, selected, and approved by Dr. Weil and a team of physicians and researchers who are experts in the field of nutritional supplementation.

All our products are made by manufacturers who must meet our strict guidelines for quality control, as well as Good Manufacturing Practices in all aspects of production, testing and packaging. All product ingredients are tested both prior to and after manufacturing to ensure that the constituents and doses are correct. Additionally, our products are free of any preservatives, artificial colors or flavorings, and non-essential additives.