Quick summary

Chromium is an essential trace mineral involved in macronutrient metabolism and glucose regulation. It is recognized for its role in potentiating insulin action, though its supplementation benefits are not conclusively established.

What is it?

Chromium is a trace mineral required in very small amounts in the diet. It exists in several chemical forms, with trivalent chromium (Cr3+) being the form thought to have biological activity in the human body. Chromium’s exact biochemical role is not fully defined, but it is generally considered important for normal carbohydrate, fat, and protein metabolism through its interaction with insulin.

Main functions in the body

  • Potentiates the action of insulin in carbohydrate, fat, and protein metabolism
  • Supports normal glucose metabolism

Recommended intake and upper limit

The National Institutes of Health (NIH) Office of Dietary Supplements provides Adequate Intake (AI) values for chromium due to limited data on precise essential requirements. The AI varies by age and sex but is generally around 20–35 micrograms per day for adults.

No official Tolerable Upper Intake Level (UL) has been established because there is insufficient data on adverse effects at high intakes.

Values vary by age, sex, and life stage; individuals interested in specific recommendations should consult a healthcare professional or relevant national guidelines.

Best food sources

Chromium is present in a variety of foods. Good sources include:

  • Meat
  • Whole-grain products
  • Fruits
  • Vegetables

Deficiency: causes, symptoms and risk groups

Chromium deficiency is rare and typically occurs only under unusual clinical conditions, particularly:

  • Individuals receiving total parenteral nutrition (TPN) without chromium supplementation
  • People with severe malnutrition
  • Possibly elderly or those on long-term intravenous feeding regimens

Signs and symptoms of chromium deficiency may include:

  • Impaired glucose tolerance
  • Peripheral neuropathy
  • Weight loss
  • Confusion

Supplement forms

While chromium supplements are available, evidence on differential absorption or effectiveness between forms such as chromium picolinate, chromium chloride, or chromium nicotinate is limited. This page does not provide conclusive guidance favoring one form over another.

Absorption and bioavailability

Chromium is poorly absorbed from the gastrointestinal tract, with bioavailability influenced by the chemical form and dietary factors. Specific enhancers or inhibitors of chromium absorption are not well established based on current evidence.

Potential benefits: what does the evidence say?

Glucose metabolism and insulin sensitivity

Chromium’s principal studied benefit involves its potential to improve glucose metabolism and insulin sensitivity. Supplementation studies have shown mixed results:

  • Some trials report modest improvements in glucose control
  • Others find no significant benefits

Overall, the evidence is limited and inconclusive, partly due to small sample sizes, heterogeneous study designs, and variability in supplement forms and dosages. More rigorous, well-controlled human trials are needed.

Side effects and toxicity

No established toxicity level exists for chromium, and it is generally considered low risk when consumed within typical dietary amounts.

Since no Tolerable Upper Intake Level has been defined, caution is advised with the use of high-dose chromium supplements, especially without medical supervision.

Drug and nutrient interactions

Currently, there are no well-established drug or nutrient interactions with chromium supplementation documented in the supplied evidence. However, those taking medications or with health conditions should seek medical advice before starting supplements.

Who should be careful?

People who are pregnant, breastfeeding, have medical conditions such as kidney disease, thyroid disorders, iron overload conditions, or who take medications should consult a healthcare professional before using chromium supplements. Individuals on long-term parenteral nutrition should ensure chromium is included to prevent deficiency.

Frequently asked questions

  • Is chromium supplementation necessary for most people?
    Most individuals consuming a balanced diet obtain adequate chromium. Supplementation may only be necessary in rare clinical cases such as TPN without chromium or diagnosed deficiency.
  • Can chromium help control blood sugar in diabetes?
    Some studies suggest modest glucose metabolism benefits, but evidence is insufficient to recommend chromium supplements as a treatment.
  • Are some chromium supplement forms better absorbed?
    Currently, evidence does not definitively support superiority of one supplement form over others regarding absorption and efficacy.
  • Can high doses of chromium be harmful?
    No established toxicity level exists, but high-dose supplements should be used cautiously and under medical supervision.

Evidence limitations

  • Lack of sufficient well-controlled human trials for supplementation benefits
  • No defined UL or comprehensive safety data for high-dose chromium supplements
  • Limited data on absorption enhancers or inhibitors

References

Disclaimer

This page provides factual information based on current scientific evidence and authorized guidance. It does not offer medical advice or endorse specific supplements or dosages. If you are pregnant, breastfeeding, have a medical condition, or take medication, please consult a healthcare professional before making changes to your diet or supplement routine.

Last reviewed

June 2024