Abstract Background: Chinese herbal products for weight loss are popular in Iran and other countries of Asia. We have investigated the content of some of these products present in Iranian markets. Methods: Nine different types of herbal pills used for weight loss were obtained from open market and subjected to qualitative analysis. Immuno-chromatographic assays for the detection of phencyclidine and radioimmunoassay methods for thyroid hormones (T3 & T4) were employed. Results: No natural ingredient was present in the herbal slimming pills. All products except three contained triiodothyronine(T3). Magic Slim and 100% Original Super Slim carried thyroxine (T4), 10 microgram per pill and 63 microgram per pill respectively. Phencyclidine was found in herbaceous essence, Green Lean, Super Slim and Fat loss. Conclusion: Chinese herbal products must be evaluated for their safety before marketing. Manufacturers should be licensed by regulatory agency and manufactured under good manufacturing practice. Proper labeling and good surveillance systems shall ensure the protection of the consumers. Keywords: Chinese herbal pills, Immunochromatographic, Thyroxine, Triiodothyronine, Phencyclidine, Weight loss.

Keywords: Chinese herbal pills, Immunochromatographic, Thyroxine, Triiodothyronine, Phencyclidine, Weight loss.

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