Chromium Test

Chromium is a naturally occurring metal that we all need in tiny amounts for health. The form found in food—called trivalent chromium (Cr(III))—is thought to help the body use insulin more effectively. Insulin is the hormone that helps cells absorb glucose (sugar) from the bloodstream, so chromium plays a role in blood sugar regulation. It may also influence cholesterol levels by helping to improve the ratio of HDL to LDL cholesterol, though these effects are modest and not consistent across studies.

However, another form of chromium—hexavalent chromium (Cr(VI))—is a well-known industrial pollutant and carcinogen. It can cause serious harm when inhaled, especially in people who work in industries like welding, metal finishing, and leather tanning. Cr(VI) exposure is associated with lung cancer, nasal and skin irritation, and in high doses, can damage the kidneys, liver, and even the nervous system. This toxic form is rarely found in food but can contaminate water or air near industrial sites.

Once inside the body, chromium binds to proteins in the blood and is transported to tissues like the liver and kidneys. Trivalent chromium has low absorption in the gut and is mostly excreted in feces, which limits its toxicity from food or supplements. But inhaled hexavalent chromium can bypass these protections and enter cells more easily. Inside the cell, Cr(VI) is converted to Cr(III), producing reactive oxygen species—damaging molecules that can injure DNA and lead to cancer.

While some people take chromium supplements for blood sugar control or weight loss, the evidence is mixed, and excessive intake could lead to tissue accumulation. High doses of Cr(III) from supplements may interfere with iron metabolism or even cause cell damage in sensitive individuals. For most people, eating a varied diet with whole grains, fruits, and vegetables provides enough chromium. Supplements are generally unnecessary unless a physician has identified a specific deficiency, which is rare.