Taking calcium and vitamin D supplements together is likely safe but not necessary if you eat a balanced diet. Both are ...

Vitamin B12 is typically well-tolerated, but in very rare cases, there are serious side effects to be aware of. Learn more ...

What happens if your body has too much vitamin B12? Read on to find out the dangerous side effects of having excessive levels ...

If you're considering a vitamin B12 supplement because of certain dietary restrictions, medical conditions or your age, this ...

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

Research suggests that vitamins like B6 and K2 might promote heart health. Not getting enough of other vitamins, like C and D, may increase your risk of heart disease. Your body needs vitamins to ...

QUESTION: Hi Dr. Zac, am I being hoodwinked into buying vitamin supplements, or do they actually work? I’ve been feeling constantly tired despite getting enough sleep, and I suspect I might be low on ...

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

Dietary supplements are more popular than ever. Vitamins, minerals, herbs, enzymes and other botanicals are now a mainstay in medicine cabinets. Three in four Americans take at least one dietary ...

Recent research has forged a new reason to take B vitamin supplements — protection from the deleterious cardiovascular effects of air pollution. But the data are far from conclusive and much more work ...

Looking for the best biotin supplement? We reviewed nine RD-approved options that support hair, skin, and nails. See our top ...

Everyone needs vitamins and minerals for good health. Most come from food, but plenty of people add more to their diet with supplements. If you have schizophrenia, you may have heard that taking ...