Chromium Picolinate for Athletes: What the Evidence Says

Chromium picolinate was one of the headline supplements of the 1990s, promoted as a way to build muscle and lose fat by improving insulin action. Decades later, it still appears in "metabolism" formulas and weight-loss stacks. Our editorial team examined what controlled studies in athletes and in people with overweight actually found.

Chromium and why picolinate

Chromium is a trace element that has long been linked to glucose metabolism. The trivalent form found in food was traditionally thought to enhance insulin's action, an idea based partly on patients receiving long-term intravenous nutrition who developed glucose intolerance that improved with chromium.

Its essential status has since been questioned. The European Food Safety Authority, in its 2014 assessment of dietary reference values, concluded that there was no convincing evidence of essentiality and did not set an adequate intake. The EU and GB nutrient reference value of 40 µg per day remains in labelling legislation.

Dietary chromium is poorly absorbed, typically well under 2–3% of intake. Picolinic acid was paired with chromium to improve absorption, and chromium picolinate became the most widely sold form.

Food sources include whole grains, broccoli, meat, nuts and some spices, and a varied British diet is generally thought to supply sufficient amounts.

Studies on muscle and strength

Early small studies in the late 1980s suggested gains in lean mass in people taking chromium picolinate while training, which drove the supplement's popularity. However, these studies relied on less precise body composition methods.

Better-controlled research did not confirm the effect. Lukaski and colleagues gave chromium supplements to young men during eight weeks of resistance training and found no advantage in strength or body composition over placebo.

Campbell and co-workers studied older men undergoing resistance training with chromium picolinate and similarly found no extra benefit on muscle size, strength or power.

A review by Vincent concluded that chromium picolinate does not appear to have meaningful effects on body composition in humans and raised questions about potential safety issues at high intakes.

Weight loss and insulin sensitivity

Weight loss is the area where chromium is most often marketed. A meta-analysis by Pittler, Stevinson and Ernst found a statistically significant but small reduction in body weight versus placebo, which the authors judged to be of debatable clinical relevance.

A later systematic review by Onakpoya and colleagues reached a similar verdict: an average difference of around 0.5 kg over several weeks, with the quality of evidence being low.

For glucose control in people with type 2 diabetes, trial results are inconsistent, and clinical guidelines do not recommend chromium as a treatment. In healthy, lean athletes with normal insulin sensitivity, there is even less reason to expect a benefit.

In short, the "insulin sensitiser" argument has not translated into measurable gains in performance or physique.

Safety and practical points

Typical supplement doses range from about 200 to 1,000 µg of chromium per day, and in trials these amounts were generally well tolerated over weeks to months.

There have been isolated case reports of kidney or liver problems in people taking very high doses, and laboratory studies raised questions about the picolinate form and DNA damage. These concerns have not been confirmed in humans at ordinary doses, but they are a reason not to exceed label amounts.

In 2003, the UK Expert Group on Vitamins and Minerals considered chromium safety and highlighted uncertainty specifically about the picolinate form; the Food Standards Agency later revised its advice after further assessment. This history illustrates how limited the long-term data are.

People with kidney or liver disease, those taking diabetes medication (due to possible additive effects on blood sugar) and pregnant women should consult a doctor before using it.

• Do not expect noticeable changes in muscle or fat.
• Do not exceed the dose stated on the label.
• Check with your doctor if you take insulin or tablets for diabetes.
• A varied diet usually covers chromium needs.

Editorial conclusions

For athletes, chromium picolinate is a supplement whose reputation outlasted its evidence. Well-controlled training studies have not shown benefits for muscle mass or strength.

Weight-loss effects are small and of questionable practical value, and the insulin-sensitivity argument has not delivered results in healthy, active people.

Most athletes are better served spending their attention and budget on training, diet quality, protein intake and well-established supplements such as creatine where appropriate.

If this topic interests you, see also our articles on insulin sensitivity and training, on evidence behind popular fat burners, and on trace elements in sports nutrition.

References

1. Vincent JB. The potential value and toxicity of chromium picolinate as a nutritional supplement, weight loss agent and muscle development agent. Sports Med. 2003;33(3):213–230.
2. Lukaski HC, Bolonchuk WW, Siders WA, Milne DB. Chromium supplementation and resistance training: effects on body composition, strength, and trace element status of men. Am J Clin Nutr. 1996;63(6):954–965.
3. Campbell WW, Joseph LJ, Davey SL, et al. Effects of resistance training and chromium picolinate on body composition and skeletal muscle in older men. J Appl Physiol. 1999;86(1):29–39.
4. Pittler MH, Stevinson C, Ernst E. Chromium picolinate for reducing body weight: meta-analysis of randomized trials. Int J Obes Relat Metab Disord. 2003;27(4):522–529.
5. Onakpoya I, Posadzki P, Ernst E. Chromium supplementation in overweight and obesity: a systematic review and meta-analysis of randomized clinical trials. Obes Rev. 2013;14(6):496–507.
6. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on dietary reference values for chromium. EFSA J. 2014;12(10):3845.