Some claim that the substance found is Polonium-210, which has a half-life of 138 days.

Sinecatechins are natural substances found in certain green tea leaves.

It was one of the thirty-five illegal substances found in his system at the autopsy.

Quassin is one of the most bitter substances found in nature.

Cholesterol is a waxy substance found in all parts of the body.

A mortal requires a thousand times the substance found in this food.

The city also maintains a large oil industry with the substance being found both underground and offshore.

It is also a substance found in human urine.

It appeared to be the same substance found in the mice.

Cholesterol is a natural substance found in the body tissues of animals but not plants.