Phenolphthalein is a chemical substance commonly used as a color indicator in experiments. It changes color depending on if the substance it is mixed with is acidic or basic. Full definition
The illegal ingredients found in these pills and powders include things like the banned controlled substance sibutramine, which the FDA slashed from the market nearly a decade ago and the chemical phenolphthalein, which some research has suggested may be linked to cancer. (businessinsider.com)
The test also found phenolphthalein, which was taken out of U.S. markets over concerns about carcinogens. (cnbc.com)
Such supplements have also been found to contain the chemical phenolphthalein, which some research has suggested may be linked to cancer. (businessinsider.com)