Momordica charantia
Bitter melon
CautionOther names: Bitter gourd
Bitter melon in Asian cuisine and folk use; tropical and subtropical Asia.
Climbing herb with dissected leaves and narrow fruits.
- Family
- Cucurbitaceae
- Plant type
- Annual climbing 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 (Public domain).
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
- Fruit — June–October
- Processing methods
Culinary use, Herbal infusion (tea)
All methods and recipes on the card- Topics and symptoms
Digestion, Metabolism - gentle support
Topics section, Symptoms overview
Identification and mix-ups
Characteristic ripe fruits splitting.
Possible mix-ups and risks
Related cucurbits.
Similar herbs
No related herbs are linked yet.
Topics and symptoms
More topics are in the symptoms and topics overview.
- DigestionTraditional· Traditional / cultural framing
- Metabolism - gentle supportTraditional· Traditional / cultural framing
Geographic occurrence
Myanmar
Occasional (garden, cultivation, or fringe of the range)
Brazil
Occasional (garden, cultivation, or fringe of the range)
India
Occasional (garden, cultivation, or fringe of the range)
Indonesia
Occasional (garden, cultivation, or fringe of the range)
Thailand
Occasional (garden, cultivation, or fringe of the range)
Viet Nam
Occasional (garden, cultivation, or fringe of the range)
Harvest
- FruitJune–October
vegetace
Region: IndiaNotes: Fruits are picked immature, green and firm, 2–3 weeks after flowering; ripe fruits burst open to show red seed arils. Only immature fruit for the kitchen — an overripe one is soft and the seeds are not eaten.
Storage
- Refrigeration(Fruit)
Fresh fruits keep 4–5 days in the fridge in a paper bag; they ripen and yellow quickly.
- Moisture:
- In sealed plastic they soften and mould.
- Safety:
- Do not process a yellowed, split fruit.
- Drying(Fruit)
Thin slices dried in the sun or a dehydrator keep 12 months in a closed container; for tea (goya-cha) and curries.
- Light:
- Out of light.
- Moisture:
- Protect from moisture.
Processing methods on this herb card
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
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
Tea from dried slices (goya-cha) is a bitter drink, not a substitute for diabetes treatment.
Traditional / spiritual use
Kept separate from science — entries are cultural or symbolic, not medical advice.
'The gentleman's vegetable'
General
Historical mentionFolk useHerbal loreIn Chinese culinary tradition bitter melon is called 'the gentleman's vegetable' (junzi cai): it is said never to pass its bitterness on to the dishes it is cooked with, just as a noble person does not pass their bitterness on to others. On Okinawa, goya is a symbol of summer cooking and of the islanders' longevity. A cultural record, not an effect.
- Form:
- přísloví, kuchyňská tradice
- Claim strength:
- Historical mention
- Source note:
- Chinese and Okinawan kitchen saying; folk tradition.
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 Cochrane review (4 randomised trials, 479 participants) found insufficient evidence that bitter melon preparations improve glycaemic control in type 2 diabetes compared with placebo or drugs; the trials were small and of low quality.
Review articleSystematic reviewYear: 2012Limitations: Low quality and heterogeneity of trials; various forms (capsules, tablets, juice). Minor adverse effects reported (diarrhoea, abdominal pain). The review concerns concentrated preparations, not food.
Ooi CP, Yassin Z, Hamid TA — Cochrane Database of Systematic Reviews
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.
- Diabetes medicationModerate severityInteractions / medicines
Bitter melon preparations lowered blood glucose in some studies, and combined with antidiabetic drugs there is a risk of it falling too far; the Cochrane review at the same time found no evidence that they treat diabetes. As an occasional food yes, as a 'natural remedy' alongside medication no. Seeds and the red arils are not eaten.