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Effects of Chromium Supplementation on Urinary Cr Excretion of Human Subjects and Correlation of Cr Excretion with Selected Clinical Parameters

Richard A. Anderson^*, Marilyn M. Polansky^*, Noella A. Bryden^*, Kristine Y. Patterson^*, Claude Veillon^* and Walter H. Glinsmann

^* USDA, NER, Beltsville Human Nutrition Research Center, Vitamin and Mineral Nutrition Laboratory, Bldg. 307, Rm. 224, Beltsville, MD 20705 Food and Drug Administration, 200 C Street, Washington, DC 20204

Daily urinary chromium (Cr) excretion of 15 healthy free-living female subjects was 0.20 ± 0.03 µg (mean ± SEM) and nearly identical for 27 male subjects, 0.17 ± 0.02 µg. Minimum Cr absorption calculated from urinary Cr excretion was about 0.4 percent. Increasing intake fivefold by Cr supplementation led to a nearly fivefold increase in Cr excretion suggesting that the extent of absorption of supplemental inorganic chromium was similar to that from normal dietary sources. Correlations between 24-hour Cr excretion and urine volume, age, total creatinine and body weight were not found. Urinary Cr concentration of samples obtained following a morning void correlated with creatinine and Cr concentration following a glucose challenge but not with serum glucose, insulin, lipid parameters, age or body weight. Similar results were obtained for urine samples obtained from subjects during Cr supplementation. These results suggest that urinary Cr excretion does not appear to be a meaningful indicator of Cr status but is a meaningful indicator of Cr intake and that the absorption of supplemental inorganic Cr was similar to that of Cr from normal dietary sources.

KEY WORDS: • urinary chromium excretion • chromium • chromium status • trace elements • glucose • insulin • lipids

Manuscript received 25 June 1982.

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