Back in the galangal story, one detail got a single sentence and no further explanation: kencur, a plant "related but botanically distinct," easily confused with galangal even by people who use both. It's time to make good on that.
Kencur is small — its leaves lie almost flat against the soil, and its rhizome is stubby compared to galangal's longer, knobbier one. In Java, it's dried and ground into flour for beras kencur, a rice-and-kencur jamu drink associated with energy and stamina, often taken after physical work. It's chewed raw for sore throats. It's simmered into postpartum tonics. It even shows up as an ingredient in traditional sauna preparations.
In English, kencur gets called "sand ginger," "aromatic ginger," or "lesser galangal" — every single one of those names borrowing identity from a different plant. None of them are wrong exactly, but none of them are quite right either. So what actually is this thing?
One molecule, an unusually long list of jobs
Kencur belongs to a different genus entirely — Kaempferia, not Alpinia (galangal) or Zingiber (ginger) — though all three share the Zingiberaceae family. And its chemistry doesn't just differ in degree from its relatives, it differs in kind: kencur's essential oil is dominated, often at 30 to 50 percent, by a single compound called ethyl p-methoxycinnamate — EPMC for short. Ginger has none of it. Galangal doesn't rely on it either.
What's strange is how much lab-documented activity researchers have tied to this one molecule: antibacterial, antifungal, anti-inflammatory, sedative, insecticidal, and a skin-whitening effect through inhibiting the enzyme responsible for melanin production — enough that EPMC shows up in cosmetics research as well as pharmacology.
That's an unusually long job list for a single compound. Why would one molecule end up interacting with this many, this different, biological systems?
A smallholder plant with an outsized traditional footprint
Kencur is grown in home gardens and small plots across Java, lifted after eight to ten months, then sold fresh or sliced and sun-dried for the herbal trade. Ethnobotanical surveys in Indonesia document its traditional use for an unusually wide range of conditions: diarrhea, malnutrition, rheumatism, stomach complaints, cough, asthma, and as a postpartum drink for new mothers — alongside its best-known role in beras kencur, taken for fatigue and stamina after physical activity.
Its reach extends well beyond Indonesia. In India, the rhizome appears in Ayurvedic preparations as well as perfumery and cosmetics. It's cultivated and used medicinally across Malaysia, Thailand, southern China, and Bangladesh — a genuinely pan-Asian plant, even though it rarely gets the international recognition ginger or turmeric do.
Notably, some traditional use extends to conditions as serious as tuberculosis and leprosy — claims that, as the next section shows, sit well ahead of what current evidence can actually support.
The compound that settles the galangal confusion
Galangal's defining chemistry runs through 1,8-cineole, ACA, and galangin. Ginger's runs through gingerol and shogaol. Kencur's runs through EPMC almost exclusively — a cinnamic acid ester that gives it a camphor-meets-cinnamon aroma unlike either of its more famous relatives. Chemically, there's no real overlap. The "confusion" between kencur and galangal is a naming accident, not a botanical or chemical relationship.
In laboratory studies, isolated EPMC and kencur's whole extract have shown measurable anti-inflammatory activity by limiting production of leukotriene B4, a compound involved in inflammatory signaling — though researchers note this effect is real but more modest than a comparable pharmaceutical (zileuton) tested alongside it. Separately, EPMC has shown anti-metastatic activity against melanoma cells in cell culture, working through inhibition of a signaling pathway called NFκB, and demonstrated tyrosinase-inhibiting (skin-lightening) activity that's driven real interest from the cosmetics industry.
Real trials for one use, real gaps for the rest
Kencur has something several earlier Rempa plants didn't: genuine double-blind randomized clinical trials in humans, specifically for knee osteoarthritis. One trial compared kencur extract's effect on inflammatory markers (prostaglandin E2 and TNF-alpha) against meloxicam, a standard anti-inflammatory drug, and found a broadly comparable effect. A separate trial assessed pain, stiffness, and physical function in osteoarthritis patients. That's a genuinely solid pocket of evidence — real trials, a real pharmaceutical comparator, not just a placebo.
Outside that specific use, the picture changes considerably. A 2025 systematic review examining kencur's traditional claims directly flagged the gap: broad ethnobotanical use for conditions like tuberculosis and leprosy has essentially no rigorous evidence behind it, and — more importantly — the same review flagged reported genotoxicity and respiratory toxicity concerns in preliminary studies that the authors say require serious further investigation before safety can be considered settled.
To be precise about what that means: this isn't evidence that kencur is dangerous at the doses people traditionally use. Subacute toxicity studies in animals found no mortality at doses well above typical use. But it is a real, recently published call from researchers themselves for more rigorous safety research — not the reassuring "generally regarded as safe" story that often gets attached to traditional plants by default.
What we genuinely don't know yet
- Whether the osteoarthritis findings would replicate in larger, independent trials — the current evidence, while real, comes from a small number of studies.
- Whether the genotoxicity and respiratory toxicity signals flagged in preliminary research represent a genuine risk at traditional dietary doses, or an artifact of the higher concentrations used in lab testing — the researchers who raised the concern say this specifically needs more study, not less.
- Why EPMC, one fairly simple molecule, appears to interact meaningfully with such a wide range of unrelated biological systems — inflammation, pigmentation, cancer cell signaling, insect nervous systems. Coincidence of molecular shape, or something these systems share that we haven't identified?
We're comfortable saying: we don't know yet.
Kencur entered this project as a footnote — the plant people mix up with galangal. It turns out the mix-up was never chemical. It was linguistic: English borrowed "galangal" loosely enough to cover two unrelated plants, and the borrowed name outlived the distinction it was supposed to make.
How many other plants are we still calling by a neighbor's name, simply because nobody has run the chemistry to check? That's not a question with a clean answer. It's an invitation to keep looking — and to treat a shared common name as a question to investigate, not a fact already settled.