A group of small peptides (proteins) from the bonito fish, a member of the tuna family are used to create Natural Factors Anti-ACE Peptides. This product lowers blood pressure by inhibiting an enzyme known as ACE (angiotensin converting enzyme). This enzyme causes a reaction that increases both the volume of blood flowing through arteries and the degree of constriction of the blood vessels — like pinching off a garden hose while turning up the flow of water full blast! By inhibiting the action of this enzyme, Anti-ACE Peptides relax arterial walls and reduce fluid volume, effectively lowering blood pressure.