Iberogast, also known as STW5, is a liquid formulation of nine herbs. A proprietary blend, it was developed in Germany in 1961 and is available (without prescription) in other countries. Named after the genus (Iberis) of one of its ingredients, it is also claimed to possess anti-inflammatory, antioxidative and free radical-inhibiting properties as well as reduce gastric acid secretion.
^Saller R, Pfister-Hotz G, Iten F, Melzer J, Reichling J (December 2002). "[Iberogast: a modern phytotherapeutic combined herbal drug for the treatment of functional disorders of the gastrointestinal tract (dyspepsia, irritable bowel syndrome)--from phytomedicine to "evidence based phytotherapy." A systematic review]". Forsch Komplementarmed Klass Naturheilkd (in German). 9 Suppl 1: 1–20. doi:10.1159/000068645. PMID12618546.
^Melzer J, Rösch W, Reichling J, Brignoli R, Saller R (December 2004). "Meta-analysis: phytotherapy of functional dyspepsia with the herbal drug preparation STW 5 (Iberogast)". Aliment. Pharmacol. Ther.20 (11-12): 1279–87. doi:10.1111/j.1365-2036.2004.02275.x. PMID15606389.