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?

other serious complications.

For most adults, the generally established tolerable upper intake level is 4,000 IU per day, although healthcare professionals may prescribe higher doses temporarily for specific medical reasons.

Important: Vitamin D is essential, but taking high doses indefinitely without appropriate medical monitoring can be dangerous.
2. Vitamin A: Excessive Intake Can Harm the Liver

Vitamin A is essential for vision, immune function, reproduction, and healthy skin.

However, excessive amounts of preformed vitamin A, particularly retinol found in certain supplements, can cause toxicity.

Because vitamin A is fat-soluble, excessive intake can accumulate in the body.

Chronic vitamin A toxicity