Organic compounds that work with enzymes to speed up biological processes such as digestion. A coenzyme may be a vitamin, or contain one, or to be manufactured in the body from one. For example, coenzyme A - used in the metabolism of carbohydrates and fats - contains pantothetic acid, a B vitamin.

Substances needed by some enzymes to catalyze reactions (e.g. vitamins).

organic molecules that act as cofactors, such as NAD and FAD.

Complex organic cofactors; most are structurally related to vitamins.

Chemicals required by a number of enzymes for proper functioning; also known as enzyme cofactors.

Molecules that are used in the body to alter its biochemistry. Most vitamins are considered coenzmes.

Substances that are required for the activity of an enzyme. Coenzymes usually contain vitamins as a part of their structure and a metal ion as an activator.

Molecules that assist larger enzymes in the body's biochemistry. Most vitamins are or become coenzymes. (Also see Enzymes).