Relative to epinephrine, which is produced and stored primarily in the adrenal glands, norepinephrine is stored in small amounts in adrenal tissue. Its major site of storage and release are the neurons of the sympathetic nervous system (a branch of the autonomic nervous system).
Fruits with high levels of polyphenols include black chokeberries, black elderberries, strawberries, red raspberries, blueberries, plums, and black currants. Cocoa powder, dark chocolate, coffee, tea, and flaxseed meal are also high in polyphenols.
Polyphenols, a type of plant compound, provide one of the main health benefits associated with herbs and spices. Polyphenols are also abundant in certain fruits and vegetables, tea, and red wine.