Kataka: Benefits, Evidence, Dosage & Safety

TL;DR

Kataka is the seed of the clearing-nut tree (Strychnos potatorum), listed in the Ayurvedic Pharmacopoeia of India (3–6 g powder) and traditionally rubbed inside pots to clarify drinking water. Animal studies suggest anti-diabetic and liver-protective effects, but human trials are absent. Use only under qualified supervision. (46 words. Sources: API; peer-reviewed reviews)

What it is

Kataka is the dried seed of Strychnos potatorum L.f. (family Loganiaceae), a deciduous tree up to about 12 meters high, as defined in the Ayurvedic Pharmacopoeia of India's Kataka (seed) monograph API monograph. Its synonyms include Nirmali, Chakshushya, Ambuprasadah, and Payahprasadini: names that reference its water-purifying action API monograph. Seeds and root are the parts used API monograph. The seed's most abundant alkaloid is diaboline, a glycine-receptor antagonist chemically related to strychnine, along with mannogalactans and other phenolic and terpenoid compounds Thieme E-Journals.

Traditional use

The following describes classical Ayurvedic use, not clinical proof.

The API monograph lists its classical actions as chakshushya (beneficial to the eyes) and jala-prasadakara (water-purifying) API monograph. Its signature traditional use is water clarification: the seed paste is smeared inside pots filled with turbid water, which causes suspended matter to settle: hence the English name "clearing nut" Int. J. Pharm. 2010.

What modern research says

Water clarification

The seed's water-clarifying property is well documented: alkaloidal ions in the seed coagulate suspended colloids in muddy water, a physicochemical effect reported in the Wealth of India and review literature Int. J. Pharm. 2010. This is an environmental/physical action, not a health benefit: it does not establish any medicinal effect.

Blood sugar

In rats with high-fat-diet plus low-dose-streptozotocin-induced type 2 diabetes, oral treatment with S. potatorum seed extract significantly improved the activity of hepatic glucose-regulating enzymes (hexokinase, pyruvate kinase, lactate dehydrogenase), with efficacy comparable to metformin in that study (animal study) Research J. Pharm. and Tech. 2020. No human trials exist, so no blood-sugar benefit is established in people.

Liver protection and anti-inflammatory effects

A 2025 review consolidates animal and in-vitro reports of hepatoprotective, anti-inflammatory, anti-ulcer, antidiarrheal, antipyretic, and antiarthritic activity of the seed extracts IJPAR 2025. A separate study in rats reported antinociceptive (pain-reducing) and antipyretic effects of the seeds in chemical and thermal models of nociception (animal study) Int. J. Pharm. 2010. All evidence is preclinical.

Dosage

The Ayurvedic Pharmacopoeia of India's Kataka (seed) monograph specifies a dose of 3–6 g of the drug API monograph. Dosing belongs to a qualified practitioner and should not be self-directed.

Safety & contraindications

FAQs

What is Kataka (Nirmali)?

Kataka is the Sanskrit name for the seed of Strychnos potatorum, a deciduous tree of the Loganiaceae family also called the clearing-nut tree or Nirmali API monograph. Its classical name Ambuprasadah ("that which makes water clear") refers to its traditional use in purifying turbid water API monograph.

How does Kataka purify water?

The seed contains alkaloidal and colloidal compounds that coagulate suspended particles in muddy water, causing them to settle: a physicochemical clarification effect documented in Indian materia medica Int. J. Pharm. 2010. This is a water-treatment action, not a medicinal health benefit.

Does Kataka help diabetes?

Only in animals so far. A rat study of streptozotocin-induced type 2 diabetes found seed extract improved key glucose-metabolizing liver enzymes about as well as metformin in that model Research J. Pharm. and Tech. 2020. No human trials exist, so it is not an established diabetes treatment.

Is Kataka poisonous like nux vomica?

Kataka and nux vomica (Strychnos nux-vomica) belong to the same genus. Kataka seed's main alkaloid is diaboline, a glycine-receptor antagonist related to strychnine Thieme E-Journals. Rodent studies found no toxicity up to 2,000 mg/kg PMC, but human safety data is absent, so use it only under qualified supervision.

What is the Ayurvedic dose of Kataka?

The Ayurvedic Pharmacopoeia of India's Kataka (seed) monograph specifies 3–6 g of the drug API monograph. Dosing belongs to a qualified practitioner and should not be self-directed.

Sources

This article is for educational purposes only and is not medical advice. Consult a qualified practitioner before using any herb.