Enzymes

Acidophilus - The Friendly Bacteria

Acidophilus is a beneficial strain of bacteria. It can be helpful in health situations involving digestion and bowel functions.
http://www.pspinformation.com/nutrition/enzymes/acid.shtml

Bromelain - Research and Medical Usage

Bromelain: Therapeutic Applications
http://www.pspinformation.com/nutrition/enzymes/bromelain.shtml

Monoamine oxidase and its affects on the brain

Too little or too much of the neuronal enzymes in the brain can affect the health or personality of the individual. One interesting enzyme in the brain is called monoamine oxidase, or MAO. This enzyme is important in the formation and progression of various diseases of the central nervous system.
http://www.pspinformation.com/nutrition/enzymes/mao.shtml