See, there's a natural chemical on her world that's poisonous as all hell anywhere else.

It works by blocking the action of certain natural chemicals in your body, such as epinephrine, on the heart and blood vessels.

It is believed to work by blocking the production of certain natural chemicals that may cause pain and swelling.

Our defenses are general ones; they do not discriminate between natural and synthetic chemicals.

A third approach involves the natural chemicals known as pheromones.

This provided a basis for challenge with these additives and natural chemicals.

Microbes can be found in rocks that are thousands of feet below the surface, living off natural chemicals.

These are natural chemicals that normally do not accumulate in the body.

Some break down natural chemicals in their environment.

It's caused by natural chemicals in the body called prostaglandins.