Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Monoterpenes, a class of terpenes commonly found in essential oils of plants such as peppermint, caraway, and citrus fruits, have traditionally been used to support digestive health, including the relief of acid indigestion (dyspepsia). Historical use of monoterpene-rich essential oils as carminatives and digestive aids is well documented, especially in traditional European and Asian medicine. For instance, peppermint oil, which contains the monoterpene menthol, has a long-standing reputation for alleviating symptoms of indigestion, bloating, and abdominal discomfort.

Scientific evidence supporting the use of monoterpenes specifically for acid indigestion is moderate but not robust. Some clinical trials and studies suggest that peppermint oil, especially in enteric-coated formulations, may help reduce symptoms of indigestion and irritable bowel syndrome (IBS), possibly through smooth muscle relaxation of the gastrointestinal tract. However, the evidence is more substantial for general dyspepsia and IBS than for acid indigestion specifically. Additionally, in some cases, peppermint oil can worsen symptoms of acid reflux by relaxing the lower esophageal sphincter.

Overall, the use of monoterpenes for acid indigestion is primarily supported by tradition, with some scientific rationale but limited direct clinical evidence for this specific indication. The majority of support comes from historical use and studies on related digestive symptoms, rather than from large, high-quality trials focused on acid indigestion.

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