Compounds in green and black tea relax blood vessels by activating ion channel proteins Kumar Jeetendra | March 9, 2021 A new study from the University of California, Irvine shows that chemicals in both black and green tea relax blood vessels by activating ion channel proteins in the blood vessel wall. The discovery helps explain the antihypertensive properties of tea and could lead to the design of new blood pressure-lowering medications. Released in Cellular Physiology …