- Chromium III
- Chromium picolinate
- Niacin-bound chromium
- Chromium chloride
For Patients & Caregivers
Tell your healthcare providers about any dietary supplements you’re taking, such as herbs, vitamins, minerals, and natural or home remedies. This will help them manage your care and keep you safe.
How It Works
There is no clear evidence to show that chromium supplementation is effective for improving glucose metabolism, losing weight, or building muscle mass.
Chromium is an element required by the body in very small amounts (0.025 mg a day). Adequate amounts are usually obtained in the diet from foods such as American cheese, meat, fish, fruits, and whole grains. Lab experiments suggest chromium is involved in maintaining adequate levels of glucose, fats, and insulin in the body. In theory, this could help patients with type 2 diabetes, but the current evidence in human studies is mixed.
Chromium is sometimes combined with GTF (Glucose Tolerance Factor) in over-the-counter products. GTF is a yeast extract that helps with glucose metabolism in lab studies, but this effect has not been confirmed in humans.
Purported Uses and Benefits
To treat diabetes
Clinical trials produced conflicting results regarding chromium’s ability to lower blood glucose, cholesterol, and triglycerides.
To treat polycystic ovarian syndrome
Data suggest that any effect of chromium on PCOS symptoms is small, with clinical relevance uncertain.
To improve muscle mass
Clinical trials do not support this use.
To improve weight loss
Clinical trials do not support this use.
Do Not Take If
- You have liver or kidney problems: There have been some case reports of liver and kidney toxicities with chromium supplements.
- You are taking sulfonylureas or insulin: Chromium can lower your blood sugar even more.
- You are taking levothyroxine to treat underactive thyroid: In one study, chromium picolinate decreased bioavailability of this drug by 17%. Therefore, these two products should not be taken together; wait several hours in between.
In rare cases, liver toxicity has occurred.
- Kidney failure: In two patients who took chromium supplements to enhance weight loss.
- Red skin lesions: Accompanied with fever, swelling, and high white blood cell counts.
- Destruction of skeletal muscle: In one patient while taking chromium picolinate in addition to other dietary supplements. Therefore, whether chromium caused this condition is not clear.
- Low blood sugar: In a 29-year-old man with diabetes who took chromium supplements in addition to insulin.
For Healthcare Professionals
Chromium is a trace element that is necessary for glucose, insulin, and lipid metabolism in humans (1) (9). It is marketed as a dietary supplement for diabetes, weight loss, and to improve muscle mass. Trivalent chromium from yeast extract is sometimes referred to as glucose tolerance factor in over-the-counter products.
Although most people consume adequate amounts through diet, chromium deficiency has been implicated in the development of diabetes (25). In vitro studies suggest that chromium produces beneficial modulatory effects under hyperglycemic conditions (26). Animal models also suggest antidiabetic (27) (28), antidepressant (29) (30) (31), and anxiolytic (32) properties.
In human studies, chromium supplementation with biotin may help improve glycemic control in type 2 diabetes (4) (5) (6), but results from other studies on chromium alone are mixed (33) (44). Other data suggest chromium picolinate may increase satiety (15). However, many clinical studies failed to demonstrate improvements in glucose metabolism, weight loss, or muscle mass (3) (7) (8) (9) (10) (11) (12) (13) (14). More recently one meta-analysis suggested that overall, chromium monosupplementation improved glycemic control and lipid profiles (34), while another determined that chromium picolinate did not affect A1C or fasting plasma glucose (35). It has been posited that mixed and modest effect sizes may reflect a greater glucoregulatory effect in complex patients with comorbid diabetes, depression, and binge eating (36). A large population study suggests that those who consumed chromium-containing supplements have a reduced risk of diabetes, but more study is needed (37).
In women with polycystic ovary syndrome, chromium supplementation did not affect endocrine profiles, and nitric oxide or glutathione levels, but did reduce acne, hirsutism, C-reactive protein, total antioxidant capacity, and malondialdehyde levels (45). However, meta-analyses suggest that for PCOS patients, chromium supplementation may not have significant benefits (46) or the magnitude of effect is small, with clinical relevance uncertain (47).
Chromium is poorly absorbed following oral administration, but salt forms such as chromium picolinate, niacin-bound chromium, and chromium chloride, appear to have better bioavailability. Other novel chromium compounds also have improved bioavailability (40) (41). Adverse effects are rare but can include renal failure (18) (19), rhabdomyolysis (20), liver damage (21), and dermatitis (22).
Purported Uses and Benefits
- Polycystic ovarian syndrome
- Muscle mass
- Weight loss
Mechanism of Action
Chromium is an essential trace element involved with glucose and lipid metabolism, circulating insulin levels, and the peripheral activity of insulin (1). In vitro and in vivo studies suggest that chromium potentiates the activity of insulin (23) (42). This is thought to occur via enhanced intracellular tyrosine kinase activity that results from an interaction between chromium, low molecular weight chromium-binding substance, and activated cell surface insulin receptors (2).
In animal models of diabetes, chromium recovered beta cell functioning and alleviated macroangiopathy (27). It also augmented the insulin signaling pathway, dulled negative-regulators of insulin signaling, enhanced AMPK activity to increase cellular glucose uptake, and attenuated oxidative stress (42). Chromium may also modulate PPAR-gamma, insulin receptor substrate, and NF-κB proteins (28). Antidepressant effects occur via modified brain 5-HT function and increased serotonergic and noradrenergic functioning (30) (31). Additional mechanisms for antidepressant and anxiolytic effects include lower plasma corticosterone levels via reversal of HPA axis overactivity (32). In humans, suggested antidepressant mechanisms include 5HT2A downregulation and increased insulin sensitivity (38).
Patients with liver or renal insufficiency may have increased susceptibility to adverse effects (24).
Rare: Hepatic toxicity (21)
Renal failure: In a 33-year-old white woman who also presented with weight loss, anemia, thrombocytopenia, hemolysis, and liver dysfunction after chronic high doses of chromium picolinate to enhance weight loss (18); and in a 49-year-old female nurse who took chromium picolinate 600 mcg daily for 6 weeks for weight reduction (19).
Acute generalized exanthematous pustulosis: Characterized by erythematous lesions, fever, edema, leukocytosis, and eosinophilia (22).
Rhabdomyolysis: In a 24-year old patient taking chromium picolinate in addition to other dietary supplements (20).
Hypoglycemia: In a 29-year-old man with diabetes after ingesting oral chromium 1000 mcg daily in addition to taking insulin (43).