Angelica keiskei
Ashitaba
CautionOther names: Tomorrow's leaf
Ashitaba—traditional coastal vegetable of Bōsō and similar shores.
Perennial with large basal rosette and hollow stem.
- Family
- Apiaceae
- Plant type
- Perennial herb
What the safety levels mean (expand legend)
- Generally recognised as safe. Often a common herb with reasonable harvest and use; still read the specific warnings on the card.
- Information. Primarily informational — details in the text and warnings below matter most.
- Caution. Needs extra care (dose, duration, sensitive groups, interactions).
- Risky. Significant risks — verify sources, contraindications and professional guidance.
- Not for home experimentation. Not suitable to experiment with at home without knowledge and certainty.
- High risk for internal use. Particular risk with internal use (e.g. alkaloids); avoid prolonged or irresponsible dosing.
- Not specified. Level not filled in yet — rely on individual warnings and links below.
Photograph on Wikimedia Commons (CC BY-SA 3.0).
Plant habit
Safety — read before use
For this herb it is important to check warnings, mix-ups and cautions. Start with the Safety section.
Quick overview
A practical summary; details are in the sections below.
- Safety grade
- Caution details
- Scientific sources on the card
- Yes — sources are listed with claims Science section
- When and what to harvest
- Leaf — March–October
- Processing methods
Herbal infusion (tea), Culinary use, Powder
All methods and recipes on the card- Topics and symptoms
Fatigue and low energy
Topics section, Symptoms overview
Identification and mix-ups
Typical apiaceous leaves and umbels.
Possible mix-ups and risks
Other Angelica spp. are difficult vegetatively.
Similar herbs
No related herbs are linked yet.
Topics and symptoms
More topics are in the symptoms and topics overview.
- Fatigue and low energyTraditional· Traditional / cultural framing
Geographic occurrence
Japan
Common (expected wild occurrence in the region)
Harvest
- LeafMarch–October
vegetace
Region: JapanNotes: Young leaves with stalks are cut from spring to autumn; the plant owes its name 'tomorrow's leaf' to how quickly it regrows after picking. Yellow resinous sap (chalcones) oozes from the cut, a distinctive identification mark.
Storage
- Refrigeration(Leaf)
Fresh leaves keep 3–4 days in the fridge in a bag; keep the stalks in water.
- Moisture:
- They wilt and yellow.
- Drying(Leaf)
Dried chopped leaves for tea keep 12 months in a closed container; powder 6 months.
- Light:
- Out of light or the green fades.
- Moisture:
- Protect from moisture.
Processing methods on this herb card
Infusion or brief extraction in hot water; usually without long boiling.
Full method description (from the catalogue)
In the narrow sense, "tea" often means an infusion: you pour water just off the boil over the dried plant matter and let it steep for a few minutes. Temperature, steep time, and the herb-to-water ratio change both flavour and what dissolves into the liquid.
Compared with a decoction, heat exposure is shorter and gentler; tender leaves and flowers are often better as an infusion than with prolonged simmering. For each herb, always follow the plant card for suitable plant part, preparation, and safety notes — general rules never replace species-level judgement.
Traditional context for this method: yes·Scientific context for this method: no
Cooking, baking, seasoning as food — general category without therapeutic claims.
Full method description (from the catalogue)
Culinary use covers herbs as ingredients in dishes, drinks, or spice mixes. This overview does not evaluate medicinal effects — only reminds you about species intent, allergies, and heat treatment where needed (e.g. some fruits or plant parts).
Combining with alcohol, sugar, or long cooking changes outcomes; verify culinary sources.
Traditional context for this method: yes·Scientific context for this method: no
Finely ground dried herb; dosing and solubility depend on species.
Full method description (from the catalogue)
Powder increases surface area for liquids or food. Home milling needs a clean grinder and control of fineness; very fine powder may clog tea filters.
Store airtight against moisture and pests.
Traditional context for this method: no·Scientific context for this method: no
Traditional / spiritual use
Kept separate from science — entries are cultural or symbolic, not medical advice.
Tomorrow's leaf from Hachijō island
General
Historical mentionFolk useHerbal loreAshitaba, 'the leaf that regrows by tomorrow', was a vegetable of exiles and fishermen on the Izu islands and gained a reputation as a longevity herb; the Edo-period herbal Yamato honzō (Kaibara Ekiken, 1709) lists it as a medicinal plant of Hachijō island. Today the islands serve it as tempura, tea and soba dough. A historical record, not evidence of effect.
- Form:
- „bylina dlouhověkosti“ ostrovanů, list v edoských herbářích
- Claim strength:
- Historical mention
- Source note:
- Kaibara Ekiken, Yamato honzō (1709); local tradition of the Hachijō and Izu islands.
Scientific notes
Each claim lists a study type and a source (URL or DOI) where available. Dose notes from the literature are informational only.
How to read evidence strength and study type labels
Labels summarise how the catalogue entry is tagged — they are not a medical verdict on efficacy. For every row, read the summary, limitations and source link.
Evidence strength
- Evidence level not specified
- The author did not grade the record; judge from the summary, limitations and source link.
- Narrative / orientational literature
- Descriptive or expert literature without controlled group comparison — context rather than proof of effect.
- Weak evidence
- Study or conclusion with major methodological limits; treat only as a pointer for further reading.
- Preliminary findings
- First or smaller studies — interesting direction, not the final word on efficacy or safety.
- Moderate strength of evidence
- Moderate strength by study design; sample and context limits still apply.
- Stronger evidence
- Stronger design or consistency of results within the study's stated limits.
- Review article
- A review summarises multiple sources; quality depends on review method and field.
Study type
- Narrative / expert text
- Expert text or overview without a classical study design.
- In vitro study
- Cell culture or test-tube experiment — does not show an effect in the body.
- Animal study
- Animal model — transfer to humans is not automatic.
- Observational study
- Observing groups without random treatment assignment; confounding is possible.
- Clinical trial
- Human clinical trial; sample size and control group matter.
- Randomised controlled trial
- Randomised controlled trials are among the stronger designs when well conducted.
- Review study
- A review aggregates multiple papers — quality depends on selection rules.
- Systematic review
- Systematic review with explicit search and selection methodology.
- Meta-analysis
- Statistical pooling of studies; outcome depends on input data and heterogeneity.
- Regulatory assessment / monograph (EMA, WHO…)
- Regulatory body summary for a herbal product — different context from a single RCT; often about products, not home tea.
- Expert monograph (herbal preparations)
- Structured literature summary for a plant or drug — quality depends on author and edition year.
The review summarises ashitaba's chalcones (xanthoangelol, 4-hydroxyderricin), coumarins and other constituents and laboratory studies of their antioxidant, anti-inflammatory and metabolic actions; it notes that human clinical studies are few and small.
Narrative / orientational literatureReview studyYear: 2017Limitations: Mostly in vitro and animal data; the presence of coumarins is also a safety question the review leaves open.
Kil YS, Pham ST, Seo EK, Jafari M — Archives of Pharmacal Research
Images
The main photo is in the card header. More images will appear here when available.
Safety
What the warning types mean
The type on each warning helps group themes — it does not replace the separate severity badge.
- Internal use
- Risks from swallowing, extracts, duration of use or concentration for internal use.
- Interactions / medicines
- Possible effect on medicines or concurrent treatment — check sources and a professional.
- Raw plant parts
- Raw, unripe or poorly prepared plant parts can be dangerous.
- Toxins and regulation
- Toxic constituents or regulated compounds (e.g. in distillates).
- Contact with the plant
- Skin or mucosa irritation from contact with fresh plant or sap.
- Allergy
- Allergic reactions, often linked to family sensitisation.
- Harvesting and contamination
- Contamination, species mix-ups or harvesting from unsuitable places.
No structured safety records yet.