Your developing fetus makes substances that can be found and measured in amniotic fluid.

It reacts with air and water and makes corrosive substances.

They help make substances called antibodies that help the body fight infection.

"Eggs make substances that damage the liver," he explained.

When fat is broken down for energy, the body makes substances called ketones (or ketone bodies).

After all, among the estimated 100,000 human genes are ones that provide blueprints for making natural substances to fight the most deadly diseases.

Those who suffer from the disease can not make certain substances in the blood.

Aspirin and acetaminophen relieve pain by keeping your body from making certain natural substances.

Like other glands, testicles make chemical substances, called hormones that keep the body working.

Recipes how to make napalm-like substances can be found on the Internet.