Background: Tartrazine and metanil yellow are organic azo dyes widely used in food products, drugs, and cosmetics. The present study was conducted to evaluate the toxic effect of these food colors on the liver, and kidneys of albino rats. The study also evaluates the protective effect of quercetin as an antioxidant against the toxic effect of these food colors. Methods: Eighty adult albino rats were divided into 8 groups. Control group, 3 groups were treated with a blend of tartrazine and metanil yellow in 3 doses of 25, 50, and 75 mg/kg for 30 days by gavage, one positive control group was treated with quercetin 50 mg/kg for 30 days, and three groups were treated with the blend of tartrazine and metanil yellow plus 50 mg/kg of quercetin. At the end of the experiment, serum samples were collected to evaluate liver and kidney functions. Liver, kidney samples were fixed in 10% formalin and routinely prepared for paraffin sectioning and staining for histopathological examination. Results: The study showed a significant elevation of liver and kidney function after treatment with the food color blend. Also, a significant improvement in liver and kidney function was observed after treatm
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