Dietary supplements are widely used to support health, but experts warn that taking more than the body needs can backfire—especially when it comes to skin. Some nutrients that are beneficial in small amounts may quietly trigger problems when consumed in excess.

Iodine is essential for thyroid function and is already present in many foods and supplements. Too much iodine can disrupt hormone balance, which often shows up on the skin as acne, redness, or inflammation. Because iodine is released through sweat and oil glands, excess levels can irritate pores and prolong breakouts, even in people who don’t usually have acne.

Iron is another mineral that requires caution. While vital for oxygen transport, the body has limited ways to remove excess iron. High levels can increase oxidative stress, damaging collagen and elastin, which may lead to dullness, fine lines, and reduced skin elasticity over time.

Because iodine and iron are common in everyday diets, adding supplements without medical need can push intake beyond safe levels. Dermatologists recommend using supplements only when indicated by testing, emphasizing that healthy skin depends on balance—not excess.