Vitamin C toxicity is rare, but daily doses over 2,000 milligrams may cause unpleasant side effects like digestive issues, headache, and skin flushing.

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.

Too much vitamin D can harm your health. Know the warning signs, side effects, and safe ways to manage your vitamin D levels ...

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 ...

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 deficiencies, and even interfere with medications.

The ideal time to take your multivitamin may depend on its specific nutrients and formula, but there are generally ways to avoid common mistakes.

It’s also generally okay to take a multivitamin alongside other supplements or medications. “A multivitamin can be taken on ...

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, ...

Limited evidence suggests that vitamins C, D, and E may be beneficial for people experiencing restless legs syndrome (RLS), although more research is required to definitively assess the efficacy of ...

Although research has found a strong connection between vitamin D deficiency and depression, it’s unclear whether vitamin D supplements can improve the symptoms of seasonal affective disorder.

Topical vitamin C and retinol both provide anti-aging benefits to your skin, and combining them may compound their effects, but may cause irritation.