Shark’s produce a natural compound called squalene in their liver to help regulate their buoyancy. Sharks that live in deeper water tend to have more oil in their livers. An estimate by the conservation group Shark Allies has suggested that as many as 500,000 sharks may be harvested in order to create enough COVID-19 vaccines to distribute globally, if synthetic alternatives to squalene are not created.

Courtesy of Christopher Jay.

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