Looking at the results from four meta-analyses, one reported a statistically significant decrease in fasting plasma glucose levels (FPG) and a non-significant trend in lower hemoglobin A1C (HbA1C). A second reported the same, a third reported significant decreases for both measures, while a fourth reported no benefit for either. A review published in 2016 listed 53 randomized clinical trials that were included in one or more of six meta-analyses. It concluded that whereas there may be modest decreases in FPG and/or HbA1C that achieve statistical significance in some of these meta-analyses, few of the trials achieved decreases large enough to be expected to be relevant to clinical outcome. The authors also mentioned that trial design was for chromium as an addition to standard glycemic control medications, and so did not evaluate chromium as a first treatment for type 2 diabetes, or for prevention of progression from pre-diabetes to diabetes. The conclusion was that "...there is still little reason to recommend chromium dietary supplements to achieve clinically meaningful improvements in glycemic control." The American Diabetes Association publishes a standards of care review every year. The 2018 review makes no mention of chromium supplementation as a possible treatment. Supplementation
Chromium supplementation in general is subject to a certain amount of controversy as it is by no means clear that chromium is an essential element in human biology. Nevertheless, chromium is an ingredient in total parenteral nutrition, along with other trace minerals. It is also in nutritional products for preterm infants.
Many chromium-containing products, including chromium chloride, chromium citrate, chromium(III) picolinate, chromium(III) polynicotinate are sold as non-prescription dietary supplements. Government-approved health claims
In 2005, the U.S. Food and Drug Administration approved a Qualified Health Claim for chromium picolinate with a requirement for very specific label wording: "One small study suggests that chromium picolinate may reduce the risk of insulin resistance, and therefore possibly may reduce the risk of type 2 diabetes. FDA concludes, however, that the existence of such a relationship between chromium picolinate and either insulin resistance or type 2 diabetes is highly uncertain." In 2010, chromium(III) picolinate was approved by Health Canada to be used in dietary supplements. Approved labeling statements included: "...provides support for healthy glucose metabolism." The European Food Safety Authority (EFSA) approved claims in 2010 that chromium contributed to normal macronutrient metabolism and maintenance of normal blood glucose concentration. See also
Chromium toxicity

References
Further reading
A "possible resolution of controversies in chromium biology" is suggested by Wolfgang Maret in chapter 9, pp 246–248 of Essential Metals in Medicine: Therapeutic Use and Toxicity of Metal Ions in the Clinic. edited by Astrid Sigel, Eva Freisinger, Roland K. O. Sigel and Peggy L. Carver; de Gruyter GmbH (publisher), 2019 Berlin. "Dietary Supplement Fact Sheet: Chromium". Office of Dietary Supplements, National Institutes of Health. Retrieved 24 February 2013. Chromium in glucose metabolism


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