Chromium

Chromium picolinate is said to promote weight loss, build muscle, reduce body fat, lower cholesterol and triglyceride levels, and enhance insulin function. Although chromium deficiency impairs insulin function, there is little evidence that supplementation helps patients with diabetes, nor is there evidence that it benefits body composition or lipid levels.

The role of supplemental chromium is controversial, and the clinical data conflict.

A 2002 meta-analysis evaluated 20 randomized clinical trials and concluded that the data indicated no effect of chromium on glucose or insulin levels in nondiabetic patients; results were inconclusive in patients with diabetes (1 References Chromium, a trace mineral, potentiates the action of insulin. Nutritional sources that contain sufficient amounts include carrots, potatoes, broccoli, whole grains, and molasses. Picolinate... read more ).

A rigorous analysis of randomized controlled trials involving patients with type 2 diabetes evaluated clinically meaningful outcomes (such as a hemoglobin A1C < 7% or a 0.5% or greater decrease in hemoglobin A1C) and found that at best chromium supplementation provides a small benefit. Specifically, in only 3 of 14 trials did hemoglobin A1C decrease to < 7%, and in 5 of 14 trials hemoglobin A1C decreased by 0.5% or greater (2 References Chromium, a trace mineral, potentiates the action of insulin. Nutritional sources that contain sufficient amounts include carrots, potatoes, broccoli, whole grains, and molasses. Picolinate... read more ). A different meta-analysis of 28 studies reported a significant decrease in fasting plasma glucose and hemoglobin A1C, although there was heterogeneity of included studies, such as different doses and types of chromium (3 References Chromium, a trace mineral, potentiates the action of insulin. Nutritional sources that contain sufficient amounts include carrots, potatoes, broccoli, whole grains, and molasses. Picolinate... read more ).

A 2019 meta-analysis evaluating impact of chromium on anthropometric indices in subjects with overweight or obesity found a small but significant decrease in weight, body mass index, and body fat percentage. The authors stated the effect size was medium, and the clinical relevance for weight loss is uncertain (4 References Chromium, a trace mineral, potentiates the action of insulin. Nutritional sources that contain sufficient amounts include carrots, potatoes, broccoli, whole grains, and molasses. Picolinate... read more ).

Notably, a Cochrane review of randomized controlled trials of chromium picolinate in adults with overweight or obesity found a small but significant decrease in weight; however, the researchers stated there was no overall evidence to support use (5 References Chromium, a trace mineral, potentiates the action of insulin. Nutritional sources that contain sufficient amounts include carrots, potatoes, broccoli, whole grains, and molasses. Picolinate... read more ).

Randomized, controlled, clinical trials are needed to determine whether chromium can influence diabetes, lipid metabolism, or weight loss. These studies should control or adjust for baseline chromium status and the form of chromium used and be done in well-defined at-risk populations in whom food intake is monitored.

Several studies have demonstrated that daily doses up to 1000 mcg of chromium are safe. Some forms of chromium may contribute to gastrointestinal irritation and ulcers. Isolated cases of impaired kidney and liver function have been reported; thus, people with pre-existing kidney or liver disorders should avoid supplementation. Chromium supplements interfere with iron absorption.

Chromium may lower blood sugar when combined with insulin or sulfonylureas, but not metformin.

Chromium may decrease levothyroxine serum levels and, therefore, the dose of thyroid replacement therapy may need adjustment in patients using supplemental chromium.

Owing to ferritin binding, chromium use may cause iron deficiency.

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