Chromium
Also known as: Cr
What Does Chromium Measure?
Chromium (Cr) is an essential trace mineral measured in the blood, typically as serum or plasma chromium levels. The test quantifies the concentration of chromium in micrograms per liter (µg/L) or nanograms per milliliter (ng/mL). Chromium exists in several oxidation states, but the trivalent form (Cr³⁺) is the biologically active and nutritionally important form found in the human body. Blood chromium testing reflects both dietary intake and occupational or environmental exposure to this mineral.
Why Does Chromium Matter?
Chromium plays a critical role in macronutrient metabolism, particularly in enhancing the action of insulin — the hormone responsible for regulating blood glucose levels. It is believed to help insulin bind more effectively to receptors, thereby improving glucose uptake by cells and helping to maintain stable blood sugar. Low chromium levels have been associated with impaired glucose tolerance, insulin resistance, elevated cholesterol, and an increased risk of type 2 diabetes. Conversely, excessive chromium — typically from industrial or occupational exposure — can be toxic, particularly the hexavalent form (Cr⁶⁺), which is a known carcinogen and can damage the kidneys, liver, and lungs.
Normal Ranges
Males
0.05–0.50 µg/L (serum/plasma)
Females
0.05–0.50 µg/L (serum/plasma)
Children
Varies by age; generally similar to adult ranges but data is limited — typically <0.50 µg/L
Causes of High Levels
- Occupational exposure to chromium compounds (e.g., welding, chrome plating, leather tanning)
- Environmental contamination through contaminated drinking water or air near industrial sites
- Excessive supplementation with chromium picolinate or other chromium supplements
- Stainless steel cookware leaching small amounts of chromium into acidic foods
- Renal impairment reducing excretion of chromium from the body
- Hexavalent chromium (Cr⁶⁺) exposure from industrial waste or polluted water sources
Causes of Low Levels
- Poor dietary intake with a diet high in refined sugars and processed foods, which deplete chromium
- Increased urinary chromium excretion due to high-sugar diets or physical stress
- Aging, as chromium absorption and tissue stores naturally decline with age
How to Improve Your Chromium
Diet
- Eat chromium-rich whole grains such as whole wheat bread, bran cereals, and oats regularly
- Include broccoli and green beans, which are among the best vegetable sources of chromium
- Consume lean meats and poultry, particularly beef and turkey, which provide meaningful amounts of chromium
- Add nuts, especially Brazil nuts and hazelnuts, as regular snacks to boost chromium intake
- Reduce consumption of refined sugars and highly processed foods, which accelerate chromium loss through urine
Supplements
- Chromium picolinate 200–1000 µg/day is the most bioavailable supplemental form; consult a doctor before use
- Chromium polynicotinate (niacin-bound chromium) at 200–400 µg/day as an alternative well-absorbed form
- Brewer's yeast, which is a natural food-based source containing glucose tolerance factor (GTF) chromium
- Multivitamin/multimineral supplements containing 25–45 µg of chromium to maintain baseline levels
- Do not exceed the tolerable upper limit without medical supervision; high-dose supplementation may have adverse effects
Related Biomarkers
Frequently Asked Questions
What does a low chromium level mean for my health?
Low chromium levels can impair insulin function, making it harder for your body to regulate blood sugar effectively. This can lead to symptoms such as fatigue, difficulty concentrating, increased sugar cravings, and over time may contribute to insulin resistance or type 2 diabetes. People with low chromium may also experience elevated cholesterol and triglyceride levels. Improving dietary intake or supplementing under medical guidance can help restore levels.
Can chromium supplements help with weight loss or diabetes?
Chromium supplements, particularly chromium picolinate, have been studied for their potential to improve insulin sensitivity and support blood sugar regulation, which may benefit people with type 2 diabetes or prediabetes. Some studies show modest improvements in glucose control and lipid profiles. However, evidence for significant weight loss is mixed and not conclusive. Chromium supplements should be used as an adjunct to a healthy diet and lifestyle, not as a standalone treatment. Always consult a healthcare provider before starting supplementation.
Is hexavalent chromium (Cr⁶⁺) the same as the chromium in supplements?
No, they are very different. The chromium found in food and supplements is trivalent chromium (Cr³⁺), which is safe and essential for normal metabolism. Hexavalent chromium (Cr⁶⁺), also called chromium-6, is an industrial byproduct found in certain polluted environments (famously highlighted in the Erin Brockovich case). Cr⁶⁺ is toxic and classified as a human carcinogen by multiple health agencies. It is important not to confuse these two forms when interpreting chromium-related health information.