It works by boosting the supply of serotonin a chemical produced naturally in the brain.

Many chemicals employed in industry have little therapeutic usefulness but may produce poisoning in man when they are used.

Certain chemicals stimulate the heart and produce other changes that allow that person to run from danger or to stand and fight.

The Web sites for these products tell you that water cannot eliminate all the chemicals found on produce these days.

Along with natural endorphins, these chemicals produce the euphoria most people feel during a good kiss.

Different dyes and chemicals produce a distinctive wavelength that is determined during analysis.

These chemicals either alter the experience of pain or produce bodily changes that promote a sense of well-being.

Like natural petroleum, the chemicals produced can be made into fuels as well as polymers.

Other chemicals may produce other colours, and performers often experiment with various choices.