At the basis of our conscious experience are chemicals called neurotransmitters.

It also contains a chemical called thujone that can cause brain problems.

A chemical called phenol is usually used for a deep peel.

Many give off chemicals called toxins, which can damage tissue and make you sick.

It was all a plan to get hard data on the performance of a chemical called retrosarin.

The active ingredient of most spermicides is a chemical called nonoxynol-9.

"I think they usually use a chemical called ninhydrin, or something similar, but it's not my area of expertise."

Up until now, American regulators had focused on a chemical called melamine.

The brain needs nutrients to make necessary chemicals called neurotransmitters.

Threonine is changed in the body to a chemical called glycine.