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Dietary geraniol ameliorates intestinal dysbiosis and relieves symptoms in irritable bowel syndrome patients: a pilot study
Authors:Fernando Rizzello  Chiara Ricci  Michela Scandella  Elena Cavazza  Elisabetta Giovanardi  Maria Chiara Valerii  Massimo Campieri  Antonietta Comparone  Luigia De Fazio  Marco Candela  Silvia Turroni  Enzo Spisni
Affiliation:1.Department of Medical and Surgical Sciences,University of Bologna,Bologna,Italy;2.Department of Clinical and Experimental Sciences,University of Brescia,Brescia,Italy;3.Department of Biological, Geological and Environmental Sciences, Biology Unit,University of Bologna,Bologna,Italy;4.Department of Pharmacy and Biotechnology,University of Bologna,Bologna,Italy
Abstract:

Background

(Trans)-3,7-Dimethyl-2,6-octadien-1-ol, commonly called geraniol (Ge-OH), is an acyclic monoterpene alcohol with well-known anti-inflammatory and antimicrobial properties. Ge-OH is a non-toxic compound classified as Generally Recognized As Safe (GRAS) by the US Food and Drug Administration and the European Food Security Agency.

Methods

Ge-OH was orally administered at a maximum daily dose of 8?mg?kg(??1) body weight for four weeks in a delayed release formulation capable of reaching the colon. Fecal microbiota and blood cytokines were analyzed before and after Ge-OH treatment, as well as IBS symptomatology by using Visual Analogue Scale (VAS-IBS).

Results

The results show that orally administered Ge-OH is a powerful modulator of the intestinal microbial ecosystem, capable of leading to increased relative abundances of Collinsella and especially Faecalibacterium, a well-known health-promoting butyrate producer consistently found to be decreased in IBS patients. Moreover, Ge-OH strongly improved the clinical symptoms of colitis by significantly reducing the score recorded by the VAS-IBS questionnaire. Clinical improvement was associated with a significant reduction in the circulating MIP-1β, a chemokine found to be increased in several IBS patients.

Conclusion

Ge-OH could be a powerful component for food supplement targeted to the treatment of IBS patients.

Trial registration

ISRCTN47041881, retrospectively registered on 19th July 2018.
Keywords:
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