Rhamnaceae
Ziziphus jujuba
Da zao · Jujube · Chinese date · Red date
- Part used
- fruitseed
- Native range
- Southern Asia; cultivated across China, the Middle East and the Mediterranean
- Morphology
- A small thorny deciduous tree to ten metres with glossy three-veined leaves and small oval fruit that ripens from green through red to a wrinkled dark brown resembling a date.
What is in it
Evidence
Little controlled evidence. Small studies on the seed preparation for sleep. Eaten as a food across much of Asia without incident.
Safety
A food, and well tolerated as one. High sugar content is the only routine consideration. Seed preparations are sedating at higher doses.
Interactions: Theoretical additive sedation from seed preparations
Regulatory: Permitted as a food and as a listed medicine ingredient.
How the traditions classify it
Three systems, rating the same plant. Where they disagree, none of them is correcting the others — they are separate frameworks that arrived at their categories independently.
Historical use
Cultivated for at least four thousand years. Among the most frequently included herbs in Chinese formulas, generally in a supporting rather than a principal role, and eaten as a food throughout its range.
Recorded as history and attributed where possible. Long use establishes that a plant was widely used, not that it worked, and not that it was safe.
Worth knowing
Jujube is here as an example of the role that has no Western equivalent: an ingredient included in a formula not to treat the complaint but to look after the patient while the other herbs do.
Chinese formula construction assigns roles — emperor, minister, assistant, envoy — and da zao is almost always an assistant or envoy, protecting the stomach from harsher ingredients and harmonising the whole. Western herbal practice has nothing quite like it, and Western trial design has no way to test it, because the thing it is supposed to do only exists in the presence of the rest of the formula.
Nomenclature verified against GBIF backbone taxonomy.