Letter P

Phenolphthalein

A compound used as a laboratory reagent and acid-base indicator and also used in over-the-counter (OTC) laxative preparations.

Phenolphthalein may be a carcinogen (cancer-causing agent).

Feeding of phenolphthalein caused cancer in multiple organs in multiple species of experimental animals.

The US government in 2000 classified phenolphthalein as 'reasonably anticipated to be a human carcinogen.'

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