just go through the list of powerful ingredients used in its making. L-Citrulline: This is an essential amino acid that hikes up nitric acid Testx core in your body which in turn, improves the blood flow into your penis and helps in a harder and stronger erection. This ingredient is also beneficial to your heart as well as blood vessels and boosts up the overall immune system....
http://www.musclesupplement.org/testx-core-and-no2-shred/
http://www.musclesupplement.org/testx-core-and-no2-shred/