Dhanyaka (Coriandrum sativum)

TL;DR

Dhanyaka (Coriandrum sativum) is coriander seed, used as a spice and in traditional medicine for digestive complaints. One small six-week trial in 40 adults with type 2 diabetes found that 1,000 mg of seed powder daily improved glucose and lipid markers: but the study was too small and too short to support treatment claims. Coriander must not replace medicines.

What it is

Dhanyaka is the Ayurvedic name for the seed (botanically the dried fruit) of Coriandrum sativum, an aromatic annual herb of the Apiaceae (Umbelliferae) family. The same plant gives us two common foods: the fresh leaves are known as cilantro, and the dried seeds as coriander. The seeds are used whole or ground as a spice in curries, pickles, and baked goods, and their essential oil is used in flavoring and perfumery (ethnobotanical review of coriander).

Traditional use

Coriander is one of humanity's oldest spices and medicines, cultivated for over 3,000 years. Across traditional systems, the seeds have been used for gastrointestinal complaints, flatulence, indigestion, nausea, and diarrhea, and were traditionally believed to stimulate bile and digestive secretions. In Turkey and India, coriander has been used specifically to relieve indigestion, and in Morocco it has a folk reputation for lowering blood sugar. These are historical uses, not proof of efficacy (Coriandrum sativum ethnopharmacology review; ethnobotanical review of coriander).

What modern research says

Human evidence is limited to one small randomized trial, plus a much weaker older study. Most other findings come from animals.

Randomized, double-blind, placebo-controlled trial

A 2025 randomized trial (published in Preventive Nutrition and Food Science) randomized 40 adults with type 2 diabetes to 1,000 mg/day of coriander seed powder or a matching placebo for 6 weeks. The coriander group showed greater between-group improvements in fasting glucose, insulin, HOMA-IR (a measure of insulin resistance), total cholesterol, triglycerides, LDL cholesterol, and markers of oxidative stress. There was no meaningful difference in body weight or other anthropometric measures. This is the strongest human evidence available: but it is one small trial (20 people per arm), short (6 weeks), from a single center, measuring surrogate biomarkers rather than clinical outcomes. It does not show that coriander seed treats diabetes or dyslipidemia, and it must not be used to replace diabetes medicines (2025 trial).

Older, weaker clinical study

An older study gave 5 g/day of coriander seed powder for 60 days to one group of NIDDM patients (a parallel group received aniseed powder instead), under a diabetologist's supervision, and reported improvements in glycemic, lipid, and oxidative-stress measures. It used before-and-after testing without strong randomization or blinding, so it provides only weak supporting context (Rajeshwari et al., 2011/6.pdf)).

Preclinical evidence

Many of coriander's reported glucose- and lipid-lowering effects come from rat studies: for example, an aqueous coriander seed extract (20 mg/kg) improved glycemic and lipid parameters in obese, hyperglycemic, hyperlipidemic Meriones shawi rats. Animal findings are hypothesis-generating, not evidence of human benefit (Aissaoui et al., 2011).

Dosage

The only randomized trial used 1,000 mg of coriander seed powder per day for 6 weeks: a research regimen, not a recommendation (2025 trial). Culinary coriander in food is a much smaller, unstandardized exposure.

Safety & contraindications

FAQs

What is dhanyaka?

Dhanyaka is the Ayurvedic name for coriander seed: the dried seed (fruit) of Coriandrum sativum. The same plant's fresh leaves are called cilantro.

Does coriander seed help diabetes?

One small 6-week trial in 40 adults with type 2 diabetes found improvements in glucose and lipid markers with 1,000 mg/day of seed powder. That is too little evidence to support any treatment claim.

What dose of coriander seed was studied?

The randomized trial used 1,000 mg of seed powder per day for 6 weeks. An older, weaker study used 5 g/day for 60 days. These were research regimens, not dosing advice.

Are coriander seeds and cilantro leaves the same medicinally?

No: they are different parts of the plant with different compositions, and the trial evidence concerns the seed powder specifically, not the fresh leaves.

Can people with diabetes take coriander seed with their medication?

Only with clinician oversight. Self-supplementing for blood-sugar control without medical supervision is not advisable.

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.