
How an essential trace element supports sugar metabolism and when chromium becomes a danger
Chromium is a fascinating element that plays a variety of roles in our environment and diet. On the one hand, chromium(III) is an essential trace element that supports glucose metabolism and contributes to the regulation of blood sugar levels. On the other hand, chromium(VI) compounds, which are primarily found in industrial applications, can pose serious health risks. In this article, you'll learn how chromium works, what health benefits it offers, and when caution is advised.
Chromium in sugar metabolism: A small helper with a big impact
The positive side of chromium(III)

Optimal insulin action helps to stabilize blood sugar levels – an important aspect especially for people with insulin resistance or type 2 diabetes.
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Supporting insulin action:
Chromium(III) is a key component of the glucose tolerance factor (GTF). This factor improves insulin signaling and facilitates the transport of glucose into cells. Optimal insulin action helps stabilize blood sugar levels—a particularly important aspect for people with insulin resistance or type 2 diabetes. -
Nutritional sources and requirements:
Chromium is found in many foods, such as whole grain products, potatoes, milk, meat, and vegetables. The recommended daily intake is approximately 60 µg – this requirement is usually easily met with a balanced diet. Epidemiological studies and opinions from the European Food Safety Authority (EFSA) confirm that clinically relevant chromium deficiency is extremely rare in healthy individuals. -
Studies and clinical research:
Initial clinical studies suggest that supplemental chromium(III) intake may have positive effects on glucose metabolism. However, experts advise against taking supplements without medical advice, as most people already meet their needs through their normal diet.
Chromium as a toxic hazard: When does a helper become a risk?
The dark side of chromium(VI)
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Toxicity and health risks:
Unlike the beneficial chromium(III), chromium(VI) is a strong oxidizing agent that is considered carcinogenic and mutagenic. Prolonged exposure to chromium(VI) can lead to serious health problems, particularly in industrial settings—such as electroplating, tanning, or the production of chromium compounds. Studies have shown that workers in such environments have a significantly increased risk of lung cancer and chronic skin lesions. -
Environmental pollution and allergies:
Industrial wastewater can release chromium(VI) into soil and waterways. A well-known case is the one in Hinkley, California, which made headlines in the 1950s and 1960s due to the Pacific Gas & Electric company. Traces of chromium(VI) can also be found in leather goods due to incomplete reduction during tanning, which can trigger allergies in sensitive individuals. European regulations therefore limit the chromium(VI) content in leather to a maximum of 3 mg per kg. -
Regulatory measures:
To protect people and the environment, the European Chemicals Agency (ECHA) has included chromium(VI) in the REACH Regulation. Only companies with the appropriate authorization are allowed to process this substance—an important step to minimize exposure.
The oxidation state makes the difference
Chromium shows two very different faces in its different oxidation states:
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Chromium(III) in sugar metabolism
It supports the insulin mechanism, contributes to stabilizing blood sugar levels, and is essential for our health in small amounts. A balanced diet usually provides an adequate supply. -
Chromium(VI) as a toxic substance
Can cause serious health risks through industrial processes and environmental contamination. Strict legal regulations and protective measures are crucial to minimize exposure.
It's important for patients and interested parties to be aware of these differences. While chromium(III) is considered a beneficial component of our diet, handling chromium(VI) requires special caution—both in the workplace and in relation to environmental exposure.
Further information and sources
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European Food Safety Authority (EFSA):
EFSA website
(Search for "chrome" or "trace elements" for specific reports.) -
European Chemicals Agency (ECHA) – REACH Regulation on Chromium(VI):
ECHA – Chromium(VI) -
Scientific articles and studies on chromium in sugar metabolism:
PubMed – Chromium and Glucose Metabolism -
Hinkley Case (Erin Brockovich):
Wikipedia – Hinkley, California
This article is intended to provide a comprehensive overview of chromium's dual role—as a vital supporter of glucose metabolism and as a potentially dangerous substance in its toxic form. Always consult your doctor or a nutritionist if you have any questions about supplementation or specific risks.
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