Tauroursodeoxycholic acid (also known as TUDCA) is an ambiphilic bile acid. It is the taurine conjugate form of ursodeoxycholic acid. Humans are found to have trace amounts of TUDCA. Is Tudca legal in the UK? How and where can you buy Tudca in the UK? Well for a start you can buy it right here from us, we only sell high quality pure TUDCA.