50,000 Chemicals Used in Consumer Products: How Many Are Tested?

Experts guestimate that there are over 50,000 chemicals used in U.S. consumer products and industries. Guess how many are tested?

Only 300!

How could that be? Scientific American reports:
The 1976 Toxic Substances Control Act does not require chemicals to be registered or proven safe before use. Because the Environmental Protection Agency must show, after the fact, that a substance is dangerous, it has managed to require testing of only about 300 substances that have been in circulation for decades. It has restricted applications of five.
And here's the infographic via Scientific American as well:

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