Catuaba Bark Powder, 1 lb. The Tupi Indians, an indigenous tribe of Brazil, were the first to notice the incredible properties of catuaba bark. Initially they found the herb helped to enhance libido, then they noticed its numerous other beneficial qualities: relieving pain and fatigue, controlling nervousness, improving memory, helping with depression, among others. The Tupi Indians were so impressed with catuaba they spread the knowledge of its benefits to other Brazilian tribes, and even sang songs in praise of the herb. Catuaba bark has now been used for centuries, with no known side effects or toxicity.