Taurine. Taurine is an amino acid, a building block of proteins. People can generally make taurine in their bodies, but some cannot -- for these, taurine is an "essential" Amino Acid and must be supplied from the outside. It can support cardiac and liver function, and more. Http://www. Webmd. Com/vitamins-supplements/ingredientmono-1024-taurine. Aspx? Activeingredientid=1024&activeingredientname=taurine.