Mustard Powder is a finely ground spice made from dried mustard seeds (white/yellow, brown, or black), valued for its pungent, sharp flavor and its topical counterirritant, digestive stimulant, antimicrobial, and potential hypoglycemic properties. For the rheumatologist, gastroenterologist, and primary care physician, it serves as a temporary topical analgesic for musculoskeletal pain (via poultice), a digestive aid to relieve dyspepsia, a natural food preservative against foodborne pathogens, and a modest adjunct for glycemic control. For the patient, mustard powder adds pungent heat to salad dressings, sauces, marinades, pickles, and meat rubs while providing temporary relief from joint pain, improving digestion, and supporting food safety. When used in culinary amounts and applied topically with caution, it contributes to pain relief, digestive comfort, and culinary versatility.