Synopsis

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

Allium species, such as garlic (Allium sativum) and onion (Allium cepa), have a long history of use in various traditional medicine systems to support digestion and relieve gastrointestinal discomfort, including gas and bloating. Historical records from Ayurveda, Traditional Chinese Medicine, and European herbalism describe the use of Allium extracts and preparations as carminatives—herbs that help expel gas from the intestines and alleviate bloating. The rationale for this use is based mainly on anecdotal reports and the observation that Allium species can stimulate digestive secretions and motility. However, the scientific evidence for the effectiveness of Allium in treating gas and bloating is limited. While some in vitro and animal studies suggest that garlic and onion may influence gut motility or microbiota, robust clinical trials in humans focusing specifically on gas and bloating are lacking. Moreover, for some individuals, Allium vegetables can actually trigger or worsen bloating due to their content of fermentable carbohydrates (FODMAPs). In summary, the use of Allium for gas and bloating is primarily supported by traditional use, with scientific evidence being sparse and equivocal.

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