Ashitaba

Ashitaba is a leafy perennial in the genus Angelica, reaching roughly waist height, with divided leaves and umbels of small white flowers typical of the carrot family. ^[1] It is native to a limited stretch of Japan's central Pacific coast, including the Boso, Miura, and Izu peninsulas and the Izu Islands, and has since been cultivated more widely. Traditionally it is eaten as a vegetable in dishes such as tempura and soba and is brewed into tea.

When a stem is cut it exudes a viscous yellow sap that is unusually rich in chalcones, a class of flavonoid pigments. The two signature compounds are xanthoangelol and 4-hydroxyderricin, which are largely specific to this species and are thought to underlie much of its biological activity. ^[1] The plant also contains coumarins and furanocoumarins.

Most evidence for ashitaba's chalcones comes from cell and animal studies rather than human trials. In laboratory models the chalcones have shown anti-cancer activity; one study reported that 4-hydroxyderricin and xanthoangelol suppressed melanoma development by acting on the BRAF and PI3K signaling pathways. ^[1] Other animal work found that the same chalcones helped prevent dexamethasone-induced muscle wasting, pointing to possible effects on muscle metabolism. ^[2]

Pharmacokinetic experiments in mice confirmed that both chalcones are absorbed after oral dosing of ashitaba extract and then metabolized, which helps explain how orally consumed material could produce systemic effects. ^[3] A toxicological assessment of a standardized ashitaba chalcone preparation supported a reasonable margin of safety at the doses tested, consistent with the plant's long dietary history. ^[4]

Ashitaba is treated as a food and dietary supplement rather than an approved medicine. It is sold as dried leaf powder, capsules, tea, and extracts standardized to chalcone content. Because it contains furanocoumarins, handling the fresh plant or its sap can increase skin sensitivity to sunlight in some people.

Generally well tolerated as a food and supplement, with occasional mild GI upset. It is in the same botanical family as celery and angelica, so people with those allergies should be cautious. Human safety data at supplement doses is limited, so pregnant or breastfeeding women should skip it.