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?

may cause headaches, dizziness, nausea, dry skin, hair loss, bone abnormalities, and liver damage.

Very high doses can also increase pressure inside the skull.

Excessive preformed vitamin A during pregnancy can harm fetal development.

For most adults, the upper intake level for preformed vitamin A is 3,000 micrograms of retinol activity equivalents per day.

This limit does not apply in the same way to beta-carotene from vegetables.

The distinction matters because different forms of vitamin A have different safety profiles.
3. Vitamin B6: The Vitamin That Can Damage Your Nerves

Vitamin B6 is frequently included in multivitamins, B-complex supplements, magnesium