While vitamin C is essential for health, high doses can cause serious side effects. Learn the risks and how to use it safely, based on research.

Vitamin D is vital for immunity, brain health, strong bones, and overall well-being, but taking in too much from supplements ...

Taking high-dose vitamin E supplements long-term can cause serious side effects like bleeding, stroke, and heart failure. Learn safe dosing and warning signs.

Vitamin C supports immunity and skin health, but excessive intake can cause kidney stones, iron overload, enamel erosion, ...

Medically reviewed by Sohaib Imtiaz, MD Key Takeaways Vitamin D is essential, but getting too much, especially from ...

What are the benefits of multivitamins, and what side effects do they have? In the world of vitamin supplements, finding products you know are safe can be difficult. Unlike drugs, dietary supplements ...

Health experts warn that combining certain supplements—or taking them at the wrong time—can block nutrient absorption, cause ...

Amelia Ti is a Registered Dietitian (RD) and Certified Diabetes Care and Education Specialist (CDCES) based in NYC. She completed her Bachelor's in Nutrition & Dietetics at NYU and Master's in Applied ...

Vitamin D supplements may lower cholesterol, but the evidence is mixed. Avoiding high doses of vitamin D can prevent nausea and kidney stones.

A, B, C, D — or none of the above? Welcome to January, also known as resolution season, or cough and sniffle season — surely there’s no better time to dust off ...

Rachael Link is a registered dietitian and health writer based in San Francisco. She completed her undergraduate degree at the University of Central Missouri and holds a master’s degree from New York ...

Vitamins are nutrients that are found in the foods we eat. They’re needed for functions such as growth, metabolism, and nervous system activities. Share on Pinterest Anna Denisova/Getty Images Often, ...