Evidence supporting the use of: Natsudaidai
For the health condition: Constipation (adults)
Synopsis
Source of validity: Traditional
Rating (out of 5): 2
Natsudaidai (Citrus natsudaidai), also known as Japanese summer orange, has been traditionally used in Japan and some other East Asian countries for its supposed health benefits, including support for digestive health and relief of constipation. The traditional use stems from its inclusion in some Kampo (traditional Japanese herbal medicine) formulations and folk remedies, where the fruit or its peel is used to stimulate digestion and improve gut motility. The rationale in traditional medicine is often based on the bitterness of citrus peels, which are thought to promote bile secretion and enhance peristalsis, thereby alleviating constipation.
However, scientific evidence directly supporting the use of Natsudaidai for constipation in adults is very limited. While some citrus fruits and their peels contain compounds such as dietary fiber, flavonoids, and essential oils that might have mild laxative effects, there are no robust clinical studies specifically evaluating Natsudaidai for this indication. Most of the available information comes from historical texts, anecdotal reports, or extrapolation from related citrus species.
In summary, the use of Natsudaidai for constipation is primarily based on traditional practices rather than strong scientific validation. Its efficacy for this purpose in adults remains uncertain due to the lack of rigorous clinical trials.
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