Tauroursodeoxycholic Acid (TUDCA) is a liver aid introduced as a supplement by ThermoLife in their product Liver Longer. It looks like a good resource for preventing cholestasis, one of the major risks with 17 alkylated steroids.
Tauroursodeoxycholic Acid (TUDCA) is an ambiphilic bile acid. It is the taurine conjugate form of ursodeoxycholic acid (UDCA). Humans are found to have trace amounts of TUDCA. However, bears contain large amounts of TUDCA in their bile.

Function:
1. Cooling blood and hemostasis,clearing heat and diuresis,
2. As an effective hemostat or blood coagulant that has been used to reduce or stop hemorrhage and bleeding from internal organs, particularly controlling profuse menstruation, postpartum and uterine bleeding, and blood in the urine.
3.Treatment of high blood pressure,dysentery etc.

TUDCA  vs  UDCA
The advantage of TUDCA is that it is better absorbed and stored by the body, meaning that a dose of TUDCA would have a larger benefit than the same dose of UDCA. Therefore, TUDCA is better to take.
TUDCA is water soluble, not fat soluble like other bile salts. This means that it does not have a detergent-like effect, making it less damaging.