Surana (Elephant Foot Yam): Traditional Uses, Evidence & Safety

TL;DR

Surana is the corm of Amorphophallus paeoniifolius (elephant foot yam), an edible Indian vegetable and an Ayurvedic Formulary drug used traditionally for piles and digestive complaints. In rats, tuber extracts (250–500 mg/kg) reduced acetic-acid-induced colitis; a separate mouse study found a 2,000 mg/kg dose caused no acute toxicity. Raw corm contains calcium oxalate: cook it before eating.

What it is

Surana, also called Suran or Jimmikand in India, and Kattuchena in Malayalam, is the corm of Amorphophallus paeoniifolius (Dennst.) Nicolson (family Araceae), the elephant foot yam (SMPB Kerala medicinal-plants database; rat colitis study). It is a crop of South-East Asian origin, widely cultivated and eaten as a vegetable across India, and "an important constituent of many Ayurvedic preparations (Ayurvedic Formulary of India 2000)" (same study). The tuber contains phytochemicals including β-sitosterol, lupeol, quercetin, gallic acid and betulinic acid (same study).

Traditional use

Traditional and Ayurvedic records credit the tuber with gastrointestinal effects: the Ayurvedic Formulary of India (2000) lists it for haemorrhoids, vomiting, anorexia, dyspepsia, flatulence, colic, constipation and hepatopathy, and Wayanad tribes in Kerala consume it for piles, abdominal pain and constipation and as a stomachic (rat colitis study). The Kerala State Medicinal Plants Board records the corms against dysentery, piles, vomiting, diarrhoea, cough, inflammations, anaemia and seminal weakness: and notes the traditional practice directly: "the cooked corm taken internally to cure piles" (SMPB Kerala). A genus-wide review lists further ethnomedicinal uses: anti-inflammatory, anti-haemorrhoidal, haemostatic, carminative, expectorant, digestive, anthelmintic and liver-tonic (Amorphophallus genus review). These are traditional claims, not clinical proof: the experimental record is assessed separately below.

What modern research says

Ulcerative colitis (animal study)

The strongest single study is a rat experiment from a CCRAS (Ministry of Ayush) institute. Wistar rats were given methanol (APME) or aqueous (APAE) tuber extracts at 250 and 500 mg/kg for 7 days before colitis was induced with acetic acid. Both extracts significantly prevented body-weight loss and reduced colitis parameters (stool consistency, colon weight/length ratio, ulcer score, area and index), lowered colon myeloperoxidase and cytokine levels, and protected antioxidant enzymes: an effect comparable to the reference drug prednisolone (4 mg/kg) (Dey et al., Pharmaceutical Biology). This is an animal prevention model: it does not show that surana treats ulcerative colitis in people.

Other experimental activities (animal and laboratory studies)

Experimental studies of the tuber report anti-inflammatory, analgesic, CNS-depressant, cytotoxic, antibacterial and antifungal activity (same review of studies). All are preclinical findings, far from any human treatment claim.

What the evidence does not support (yet)

No human clinical trials of surana, for piles, digestion, or any other indication, were identified in the sources reviewed. The traditional piles use has encouraging ethnomedicinal and animal-model context but no trial evidence in people.

Safety & contraindications

The most important safety fact is about preparation: the raw tuber "is associated with acridity (itchy sensation in mouth and throat) upon oral consumption and presence of high oxalates raphides": needle-like calcium oxalate crystals that irritate the mouth, tongue and throat when the corm is eaten fresh. The problem is resolved by heating or drying (oral-toxicity study). Always cook the corm thoroughly; do not eat it raw.

On tested extracts: an acute oral toxicity study found no toxicity at the limit dose of 2,000 mg/kg (NOAEL above 2,000 mg/kg) in rats (colitis study), and a dedicated oral-toxicity study in mice likewise found no toxicity at a single 2,000 mg/kg dose (14-day observation) or at 1,000 mg/kg/day for 28 days (oral-toxicity study). These are animal data, not human safety evidence. The cooked corm is widely eaten as food in India, which is reassuring for food use but not a safety certificate for concentrated extracts. There are no data on medicinal use in pregnancy or breastfeeding: consult a qualified practitioner.

FAQs

What is surana?

The corm of Amorphophallus paeoniifolius (elephant foot yam, Araceae), called Suran or Jimmikand in India, Kattuchena in Malayalam, a widely eaten vegetable and a drug in the Ayurvedic Formulary of India (SMPB Kerala).

Does surana cure piles?

That is its best-known traditional use, the Kerala board records "the cooked corm taken internally to cure piles", but no human clinical trials were identified in the sources reviewed, so it is a traditional claim, not a proven treatment (SMPB Kerala).

Can surana treat ulcerative colitis?

Not established. Tuber extracts reduced acetic-acid-induced colitis in rats (comparable to prednisolone in that model), but animal findings are not human treatment evidence (Dey et al.).

Is it safe to eat surana?

The cooked corm is widely eaten as a vegetable in India. Never eat it raw: fresh corm contains calcium oxalate raphides that cause intense mouth and throat irritation; cooking resolves this (oral-toxicity study).

No established human dose exists. The only experimental dosing (250–500 mg/kg of tuber extract) was in rats: animal doses do not translate to human doses.

Can I use surana instead of my piles medication?

No. There is no clinical evidence that surana treats haemorrhoids in people. Do not stop or replace prescribed treatment; discuss it with your clinician.

Sources

Disclaimer

This article is for educational purposes only and is not medical advice. Herbal products can interact with medications and are not suitable for everyone. Talk to a qualified healthcare practitioner before use — especially if you are pregnant, breastfeeding, managing a medical condition, or taking prescription medicines.