Naai Kadugu (Dog Mustard Seeds)

We strongly advise against self-medication with Naai Kadugu for internal use. While the seeds have a long history of safe use in Siddha medicine, they are potent — the isothiocyanates can irritate the gastrointestinal tract at incorrect doses, and there may be interactions with medications you’re already taking. A qualified Siddha practitioner (Siddha Vaithiyar) or an Ayurvedic doctor will assess your specific condition, constitution, and medication profile before prescribing the appropriate dose, preparation method, and duration. For topical use — skin pastes, muscle poultices, scalp masks — the safety profile is more straightforward: do a patch test, don’t apply to broken skin, wash off if the warming sensation becomes uncomfortable, and keep away from eyes and mucous membranes. Topical application is generally safe for self-use with basic precautions.

In Tamil culture, Naai Kadugu occupies a dual role — it’s both a medicinal herb and a ritual ingredient. The sulphur-containing compounds in the seeds produce a pungent, purifying smoke when the seeds are burned or heated on charcoal during puja ceremonies and spiritual cleansing rituals. This fumigation practice has ancient roots: sulphur-based purification is found across Hindu, Buddhist, and folk traditions throughout South and Southeast Asia. In Tamil villages, Naai Kadugu is often burned in homes to “cleanse” the atmosphere — which has a practical dimension as well, since the pungent smoke is an effective insect repellent. Moolihai categorises it under Puja Packages to serve customers who purchase it for ritual use, but the seeds are exactly the same for medicinal or ritual purposes — there’s no difference in the product itself.

Naai Kadugu paste produces a warming, tingling sensation on the skin — this is the counter-irritant (rubefacient) effect and is the intended therapeutic mechanism. It’s the same sensation you’d feel from a mustard plaster or a warming muscle balm. For most people, this is a comfortable, therapeutic warmth. However, sensitivity varies: fair or thin skin is more sensitive than darker or thicker skin, and the sensation intensifies the longer the paste remains on the skin. First time use: Apply a small amount to the inner forearm for 5 minutes as a patch test. If the warmth is tolerable and no allergic reaction occurs (hives, excessive redness, swelling), proceed with application to the intended area. Do NOT apply to: broken skin, cuts, rashes that are already inflamed, the face (unless specifically directed by a practitioner), genitals, or eyes. If the sensation becomes painful rather than warm, wash off immediately with cool water and apply a soothing oil (coconut oil works well).

Store the dried seeds in an airtight container in a cool, dark, dry place. Moisture is the primary enemy — if the seeds absorb humidity, they may begin to sprout or develop mould. A glass jar with a tight-fitting lid or a resealable zip-lock bag with the air squeezed out works well. Keep away from direct sunlight, which degrades the glucosinolate content over time. Properly stored, dried Naai Kadugu seeds retain their potency for 12–24 months. The seeds should remain hard, dry, and have a mild pungent smell when crushed. If they feel soft, look discoloured, or have lost their pungency, they’ve degraded and should be replaced. Grind the seeds fresh for each use rather than pre-grinding a large batch — the isothiocyanates are volatile and begin to evaporate once the seeds are crushed.