Euryale seed

Botanical

What is it

Euryale seed (Euryale ferox), known as fox nut, makhana, or qian shi, is the seed of an aquatic plant. It is a popular snack in India when puffed, and a traditional Chinese medicine ingredient used for kidney and urinary support.

How it works

Fox nuts are mostly carbohydrate (starch) with modest protein, fiber, and minerals (potassium, magnesium, phosphorus). The starch is low in glycemic impact when puffed and minimally processed, making fox nuts a reasonable snack option. In traditional Chinese medicine, qian shi is used for 'kidney essence' support, including for urinary frequency and diarrhea. Modern pharmacological mechanisms have not been extensively characterized.

Dosage

Fox nuts are eaten as a snack, typically 30 to 60 g per serving. Traditional Chinese medicine decoctions use 10 to 15 g of dried seeds.

When and how to take it

Fox nuts are consumed as a snack or as part of meals. Time of day is not critical.

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Puffed fox nut (makhana)

Popular Indian snack; low fat, moderate protein.

Whole-food carbohydrate and protein source.

Euryale ferox seed extract (qian shi)

Dried seed used in traditional formulas for kidney and urinary support.

Used in traditional Chinese medicine decoctions.

Safety

Fox nuts are widely consumed and generally well tolerated as food. Limited adverse-event data for concentrated extracts.

Who should be cautious

No specific cautions at food intakes. Pregnant and breastfeeding people can include fox nuts in their diet.

Interactions

No significant medication interactions reported at food intakes.

Food sources

Puffed fox nuts (makhana)

Amount
1 oz
%DV
—

Frequently asked questions

Are fox nuts healthy?⌄

Yes, as a low-fat, moderate-carbohydrate snack with some protein and minerals. Choose unsalted, lightly roasted versions for the cleanest profile.

Do they help with urinary issues?⌄

Traditional Chinese medicine uses qian shi for urinary frequency, but modern clinical evidence is limited. See a clinician for persistent symptoms.

References

Euryale seed on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Euryale seed (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.