Shrigataka (Water Chestnut) in Ayurveda: Properties & Everyday Use

What it is

Shrigataka is the water chestnut, an aquatic plant whose horned, starchy fruits are eaten across Asia. The Ayurvedic drug is most often mapped to Trapa natans L., but Trapa bispinosa Roxb. is also cited, and the two names have been used interchangeably in parts of the literature. The fruit is mostly starch with modest protein and mineral content: closer to a food than a drug in its traditional role.

Classical properties

• Taste (rasa): sweet (Madhura), astringent (Kashaya)
• Qualities (guna): heavy (Guru), oily (Snigdha)
• Potency (virya): cooling (Sheeta)
• After digestion (vipaka): sweet (Madhura)
• Doshas: traditionally said to settle Pitta; may increase Vata and Kapha

Traditional use

Ayurveda classes shringataka (the common variant spelling) as sweet in taste, heavy and unctuous in quality, and cooling in potency. It is a balya (strengthening) and vrishya (vitality-supporting) food-medicine used in debility, thirst, burning sensations, and as a nutritive during convalescence. These are traditional claims, not clinical proof; the research record is examined separately below.

What research has looked at

Glucose and antioxidant effects in rodents

A study published in 2014 reported that extracts of Trapa natans lowered blood glucose in diabetic rodent models, with accompanying antioxidant effects (Wiley, 2014). A review of the plant's phytochemistry and pharmacology in the Revista Brasileira de Farmacognosia compiles similar preclinical findings: antidiabetic, antioxidant, and antimicrobial activity in laboratory and animal models (SciELO review).

These are rodent and test-tube findings. They suggest the plant is worth studying, not that eating water chestnuts treats diabetes.

What the evidence does not support (yet)

No human trial has tested shrigataka, or water chestnut in any form, for blood sugar, vitality, or any other indication. The species ambiguity (T. natans vs T. bispinosa) adds a further reason not to overstate the animal findings.

Safety notes

Water chestnut as a food is safe in normal dietary amounts. Medicinal extracts and concentrated preparations have no human safety data. People with diabetes should not treat it as a blood-sugar remedy on the strength of rodent studies. Don't adjust diabetes medication based on this article. As with all aquatic plants harvested from still water, source hygiene matters for the fresh fruit.

FAQs

What is shrigataka?

The water chestnut (Trapa natans, with T. bispinosa also proposed): an aquatic plant whose starchy fruit Ayurveda uses as a cooling, strengthening food-medicine.

Does it lower blood sugar?

In diabetic rodents, extracts did. No human trial has tested it, so there is no basis for using it as a diabetes treatment (Wiley, 2014).

Is water chestnut safe to eat?

As food, yes. It is a widely eaten fruit. Medicinal-dose extracts are unstudied in humans.

What is the recommended dose of shrigataka?

Swastik does not suggest amounts. The right amount depends on the person, the preparation and the product, so check with a qualified Ayurvedic practitioner or your doctor before taking any herb.

Sources

Rodent antidiabetic and antioxidant findings: the 2014 Trapa natans study (Wiley). Preclinical compilation: the Revista Brasileira de Farmacognosia review of Trapa phytochemistry and pharmacology (SciELO). No human clinical trials of shrigataka were identified.

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.