Which ingredient led to the largest natural sunscreen recall in 2021 due to its harmful effects on coral reefs?

In the world of natural products, not all ingredients are as harmless as they seem. In 2021, a major recall shook the natural sunscreen industry when a common ingredient was found to have unexpected environmental impacts. This recall changed manufacturing standards and consumer awareness about marine ecosystem protection. Test your knowledge about this significant product recall that transformed how we think about 'natural' sun protection.

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Oxybenzone
Zinc oxide
Aloe vera extract
Titanium dioxide