Sunlight helps your body produce vitamin D, but the same UVB rays that trigger vitamin D synthesis also damage skin cells and increase skin cancer risk. Dermatologists do not recommend unprotected sun ...

Medically reviewed by Jamie Johnson, RDN Key Takeaways Too much vitamin D from supplements can lead to harmful blood levels, ...

Vitamin D is one of the most widely used supplements in the United States, yet it is also one of the easiest to take ...

Could taking fish oil pills accelerate cognitive decline? That’s the alarming headline from a recently published study which ...

Both vitamins are good for you. Taking vitamin D, however, is better for directly boosting your energy and immunity, ...

A new review from the International Osteoporosis Foundation (IOF) Osteoimmunology Working Group, published in Osteoporosis International, provides a comprehensive evaluation of the role of vitamin D ...

Neoadjuvant pyrotinib vs pertuzumab therapy for HER2-positive early breast cancer: The HELEN HER-013 randomized clinical trial. This is an ASCO Meeting Abstract from the 2026 ASCO Annual Meeting I.

A surprising study suggests vitamin D2 supplements may reduce the body’s levels of vitamin D3 — the more effective form of vitamin D. Researchers found D3 not only boosts vitamin D status more ...

Pregnant women are routinely advised to take prenatal vitamins for their health and their baby’s development. Now, a new study published Monday in JAMA Network Open concluded that children whose ...

Have you had enough vitamin D today? Vitamin D is not just a nutrient found in food. It’s a hormone that plays a critical role in your health. Nearly every cell in your body has receptors for vitamin ...

Julia Sullivan is a health and fitness writer, editor and content strategist well as a certified personal trainer. Her byline is in many publications from Harper's Bazaar to SELF Magazine to brand ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? But if you’re one of the many Americans who doesn’t get enough of the nutrient ...