The study found that over 70% of plastics leached estrogenic chemicals in a wide range of plastic products right off the shelf, both with or without packaged contents. When the plastics were stressed by simulations of typical real world situations — dish washing, microwaving, or exposure to sunlight — that percentage increased to about 95% of the plastics tested. In other words, all plastics may leach chemicals that mimic estrogen. The study used a cut-off of 15% of the activity of the natural estrogen known as E2 as the indicator level for a positive test.
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