Found in air. Used to treat breathing problems A compound is a substance that contains atoms of two or more different elements, chemically joined together. For example, water is a compound of ...

Medically reviewed by Marisa Garshick, MD A surfactant (the shortened name for "surface-acting agent") is a chemical compound ...

A 19th-century medical dye is gaining attention for its potential cognitive benefits, sparking new research into its role in ...

Many natural substances possess interesting characteristics and can form the basis of new active compounds in medicine.

Their effects vary depending on the amount consumed and an individual’s specific reaction to the substance. For example, low doses of depressants can actually have a stimulant effect and cause a ...

Originally limited to the study of compounds produced by living organisms, organic chemistry has been broadened to include human-made substances (e.g., plastics ... and medicine. Examples of where you ...