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In that study, DAS 28 and HAQ scores of RA patients in a quercetin group where lower than those in a placebo group

Dietary iron occurs in two forms: heme iron (Fe 2+ ), which is found in animal products, like meat and seafood, and non-heme iron (Fe 3+ ), which is found in plant foods, fortified foods, and animal products

This likely explains the results of many studies that have shown decreased glutathione peroxidase activity in the circulating erythrocytes (165, 206, 254, 258, 284), leukocytes (236, 328), platelets (132, 222, 250), and whole blood (91) and plasma (263) of asthmatics versus controls

doi: 10.1186/s12888-015-0394-0 28