Taking vitamins without knowing whether your body needs them has become a common health habit. But what happens when the supplements meant to protect your health begin working against it?

combines selenium supplements with multivitamins and selenium-rich foods such as Brazil nuts.

The European Food Safety Authority established an upper intake level of 255 micrograms per day for adults.

The important point is that a nutrient required in tiny amounts does not become more beneficial simply because the dose is increased.
7. Vitamin E: High Doses May Increase Bleeding Risk

Vitamin E is an antioxidant that helps protect cells from oxidative damage.

It is sometimes promoted for skin health, cardiovascular protection, and healthy aging.

However, high-dose vitamin E supplementation can interfere with normal blood clotting.

Clinical research has raised concerns