Chromium
trace-mineral
Key Takeaways
- Chromium (trivalent) may potentiate insulin action, though its essentiality is debated
- FDA daily value is 35 mcg for adults; adequate intake ranges from 20-35 mcg by age and sex
- The European Food Safety Authority concluded in 2014 that chromium is not proven essential
- Chromium picolinate is the most studied supplemental form, particularly for blood glucose control
- Deficiency has not been confirmed in healthy populations
Evidence Spectrum
13 studies reviewed →Blood glucose control in type 2 diabetes
Multiple RCTs and systematic reviews show chromium supplementation, mainly as chromium picolinate (200-1000 mcg/day), may reduce fasting blood glucose, HbA1c, and HOMA-IR in patients with type 2 diabetes, particularly with longer intervention periods. A network meta-analysis ranked chromium as most effective for reducing fasting blood glucose and HOMA-IR among micronutrient supplements for T2DM.3459
PCOS symptom management
Chromium picolinate supplementation may improve insulin resistance in women with PCOS, but more research is needed before integration into clinical practice.1
13
Studies Reviewed
0.2 mcg
RDA (Birth to 6 months (AI))
Role in the Body
Chromium, in its trivalent (+3) form, is a trace element that may play a role in carbohydrate, lipid, and protein metabolism by potentiating insulin action. The proposed mechanism involves chromium binding to an oligopeptide to form chromodulin, a low-molecular-weight substance that binds to and activates the insulin receptor. Chromium may also have antioxidant effects. However, the essentiality of chromium is debated. While the US Food and Nutrition Board considered it essential in 2001, the European Food Safety Authority concluded in 2014 that no convincing evidence shows chromium is an essential nutrient. Recent research suggests that chromium may have pharmacological benefits at higher doses but does not meet the criteria for an essential mineral, as its absence does not produce abnormalities reversible with chromium addition. In the blood, most chromium is bound to plasma proteins, particularly transferrin. Chromium accumulates mainly in the liver, spleen, soft tissue, and bone, and is excreted primarily in urine.
- Potential potentiation of insulin action via chromodulin
- Possible role in carbohydrate metabolism
- Possible role in lipid metabolism
- Possible role in protein metabolism
- Potential antioxidant effects
Supplement Forms
Chromium picolinate
RecommendedBioavailability: 0%
Most studied form; shown to be the most efficacious form for improving blood glucose control (pmid:15208835). Found safe in numerous animal and human studies.
Chromium chloride
Bioavailability: 0%
Used in some research studies; dietary chromium is poorly absorbed regardless of form.
Chromium nicotinate (chromium polynicotinate)
Bioavailability: 0%
Another supplemental form studied for glucose metabolism effects.
Chromium yeast
Bioavailability: 0%
Yeast-bound chromium form used in some supplementation studies (pmid:39541030).
Food Sources
Broccoli
Grape juice
Whole wheat products
Potatoes
Garlic
Basil
Beef
Turkey breast
Orange juice
Green beans
Deficiency
Prevalence: Has not been confirmed in healthy populations. Earlier case reports of deficiency in TPN patients are now considered inconclusive.
Symptoms:
- Historically reported: hyperglycemia, glycosuria, weight loss in TPN patients (now considered inconclusive)
- Peripheral neuropathy (reported in TPN case studies, not confirmed as chromium-specific)
- Glucose intolerance (reported but not confirmed as chromium-specific)
Risk Factors:
- Long-term total parenteral nutrition (historically, though current TPN solutions include chromium)
- Note: true chromium deficiency may not exist in free-living populations
Safety & Interactions
Possible Side Effects:
- • Generally well-tolerated at typical supplemental doses
- • Isolated case reports of kidney damage at very high doses (hexavalent chromium is toxic but is distinct from the trivalent form used in supplements)
- • Potential for long-term toxicity at pharmacological doses is not fully established
Drug Interactions:
- • May alter levothyroxine absorption (pmid:33801406)
- • May interact with diabetes medications and enhance hypoglycemic effects
- • Potential interactions with NSAIDs and antacids
Contraindications:
- • Caution in individuals with kidney or liver disease
- • Monitor blood glucose closely if taking alongside diabetes medications
Frequently Asked Questions
Is chromium an essential mineral?
This is debated. The US considered it essential in 2001, but the European Food Safety Authority concluded in 2014 that convincing evidence for essentiality is lacking.
Does chromium help with blood sugar control?
Multiple studies suggest chromium picolinate (200-1000 mcg/day) may improve fasting blood glucose and insulin resistance in type 2 diabetes, but results vary and it is not a replacement for medical treatment.
What form of chromium supplement is best?
Chromium picolinate is the most studied form and has shown the most consistent results for blood glucose improvements in clinical trials.
Is chromium supplementation safe?
Trivalent chromium supplements are generally well-tolerated. No tolerable upper intake level has been established. Consult a healthcare provider if taking diabetes medications.
Research Sources
14 peer-reviewed studies analyzed from PubMed. 9 directly cited in this review.