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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.[1]

Iberogast is a mixture of extracts from bitter candytuft (Iberis amara), angelica root (Angelicae radix), milk thistle fruit (Silybi mariani fructus), celandine herb (Chelidonii herba), caraway fruit (Carvi fructus), liquorice root (Liquiritiae radix), peppermint herb (Menthae piperitae folium), balm leaf (Melissae folium) and chamomile flower (Matricariae flos).[2]

A meta-analysis of six randomized clinical trials demonstrated that iberogast was effective in relieving the symptoms of functional dyspepsia.[3]


  1. ^ Wegener T, Wagner H (2006). "The active components and the pharmacological multi-target principle of STW 5 (Iberogast)". Phytomedicine. 13 Suppl 5: 20–35. doi:10.1016/j.phymed.2006.07.001. PMID 16926095. 
  2. ^ 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. PMID 12618546. 
  3. ^ 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. PMID 15606389. 

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