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.
Cavity may refer to:

Biology and healthcare
Body cavity, a fluid-filled space in many animals where organs typically develop
Gastrovascular cavity, the primary organ of digestion and circulation in cnidarians and flatworms
Dental cavity or tooth decay, damage to the structure of a tooth
Lung cavity, an air-filled space within the lung

Radio frequency resonance
Microwave cavity or RF cavity, a cavity resonator in the radio frequency range, for example used in particle accelerators
Optical cavity, the cavity resonator of a laser
Resonant cavity, a device designed to select for waves of particular wavelengths

Other uses
Cavity (band), a sludge metal band from Miami, Florida
Cavity method, a mathematical method  to solve some mean field type of models
Cavity wall, a wall consisting of two skins with a cavity

See also
Cavitation, the phenomenon of partial vacuums forming in fluid, for example, in propellers
Cavitary pneumonia, a type of pneumonia in which a hole is formed in the lung
Cavity Search (disambiguation)
Hollow (disambiguation)