Karanja: Traditional Uses, Evidence & Safety

TL;DR

Karanja (Pongamia pinnata) is an Indian tree whose seed oil, bark, leaves, and roots feature in Ayurvedic tradition for skin complaints, wounds, bleeding piles, and digestive sluggishness. Its seed compound karanjin protected rat stomachs against ulcers and showed a wide safety margin in rat toxicity studies. No human trials exist, so no clinical benefit is proven.

(56 words. Sources: Fugare et al. 2021, review; PMC3137509, animal study; PubMed 41625589, animal toxicity study.)

What it is

Karanja is Pongamia pinnata (L.) Pierre, a medium-sized perennial tree in the Fabaceae (legume) family, known in Hindi as Karanja and in English as the Indian beech, widely distributed across India, Australia, Bangladesh, and China (Fugare et al., Journal of Drug Delivery & Therapeutics 2021). Roots, bark, leaves, flowers, seeds, and the seed oil are all used in traditional practice (same review). Its most studied constituent is karanjin, a furano-flavonoid isolated from the seeds (gastroprotective study, PMC).

Traditional use

In Ayurvedic and folk tradition, different parts of the tree have distinct roles: roots for cleaning gums, teeth, and ulcers; bark taken internally for bleeding piles. Leaf juice for cough, diarrhea, dyspepsia, flatulence, and skin complaints including leprosy; flowers for diabetes-related thirst; and the seed oil applied externally for itching, skin disorders, wounds, ulcers, and rheumatic pain (Fugare et al. 2021; IJCRT review). Powdered seeds were also used as a febrifuge and general tonic, and for bronchitis and whooping cough (IJCRT review). These are traditional uses, not clinical proof: the available modern studies are preclinical, as detailed below.

What modern research says

Stomach protection (karanjin)

In an animal study, karanjin (>95% pure) at 10 and 20 mg/kg inhibited 50% and 74% of swim-stress-induced ulcers in adult male rats, protected gastric mucin, normalized the ulcer-elevated H⁺/K⁺-ATPase activity, and showed antioxidant effects. 20 mg/kg given orally for 14 days produced no lethal effects and no adverse changes in liver-function markers (PMC3137509). This is a rat study: it does not establish any effect in humans.

Toxicity of karanjin

An acute and subacute oral toxicity study of karanjin in Sprague Dawley rats, single doses up to 2,000 mg/kg, and daily doses up to 250 mg/kg for 28 days, found no mortality, no treatment-related clinical signs, normal organ weights, and normal organ histology: suggesting a large safety margin in rats (Toxicology Reports 2026, via PubMed). Again, animal data only.

Toxicity of karanja seed powder

A small animal study gave karanja seed powder (churna) at 1,600 mg/kg/day for 20 days to albino rats and found no significant toxic effects on the examined organs, though mild-to-moderate pathological changes appeared in spleen and liver. The authors judged it safe at that dose in rats but advised caution with impaired liver function (IJAR 2017). "Safe in a rat study" is not a human safety claim.

What the evidence does not support (yet)

No human randomized trials of karanja or karanjin were found in this review. Traditional claims, for diabetes, skin disease, piles, or cough, rest on traditional use plus animal and laboratory studies, not on tested human outcomes.

Safety & contraindications

Human safety data for karanja are essentially absent; nearly everything known comes from traditional use and animal studies. In tradition the seed oil is used externally, which is a different risk profile from swallowing seed preparations. The animal studies above suggest low acute toxicity in rats but are not a basis for human dosing. Do not self-prescribe karanja seed powder or oil for internal use. If you have liver disease, are pregnant or breastfeeding, or take medication, talk to a qualified clinician first: and note that adulterated oils are a separate real-world quality risk.

FAQs

What is karanja?

Karanja is the Hindi name for Pongamia pinnata (Indian beech), a medium-sized tree of the legume family distributed across India and parts of Asia and Australia. Its roots, bark, leaves, flowers, seeds, and seed oil are all used in Ayurvedic tradition (Fugare et al. 2021).

What is karanja oil traditionally used for?

Traditionally the seed oil is applied externally for itching, skin disorders, abscesses, wounds, and ulcers, and as a liniment for rheumatic pain (Fugare et al. 2021; IJCRT review). These are traditional uses, not clinically proven effects.

Does karanja treat diabetes?

There is no human evidence for this. Traditional use includes flowers for diabetes-related thirst (IJCRT review), and reviews catalogue antihyperglycemic activity from laboratory and animal work (IJGP review): but with no human trials, it cannot be presented as a diabetes treatment.

Is karanja seed safe to eat?

Not established. Rat studies of karanjin and seed powder found low acute toxicity at the tested doses (PubMed 41625589; IJAR 2017), but animal studies do not prove human safety, and traditional internal use of seeds was as medicine, not food. Do not eat karanja seeds on your own.

What is karanjin?

Karanjin is a furano-flavonoid isolated from Pongamia pinnata seeds and the most studied of its constituents; in rats it showed gastroprotective and antioxidant effects (PMC3137509). Its effects in humans have not been studied.

Why does this page give no dosage?

Dosage appears on Swastik pages only with a pharmacopoeial or clinical-trial citation. No human trial of karanja exists, so we publish no dose: any amount recommended elsewhere is not evidence-based.

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.