Ultra I-3-CUltra I 3 C, provided by Douglas Laboratories, supplies significant amounts of indole 3 carbinol (I 3 C) in a proprietary blend of cruciferous vegetables for healthy hormone balance and cellular health. FUNCTIONS Indole 3 carbinol is a member of the class of sulfur containing chemicals called glucosinolates, phytochemicals found in high amounts in cruciferous vegetables such as broccoli, cauliflower, and Brussels sprouts. Indole 3 carbinol functions