L-Taurine is a sulfur-containing amino acid derivative that is not incorporated into proteins but plays important roles in various physiological processes. While not a standard α-amino acid, it acts as an antioxidant and helps protect cells from oxidative damage. Taurine is involved in bile acid conjugation, which is important for fat digestion and absorption. It also plays a role in cardiovascular health, brain function, and the regulation of calcium levels in cells.