0 calories per 1 tsp. See nutrition information for sodium content. Estd. 1869. No. 1 grade mustard seeds. 100% Natural. A common condiment. Done. Uncommonly well. Heinz Yellow Mustard: Made with 100% natural ingredients, including stone-ground no. 1 grade mustard seeds and a secret blend of spices and vinegar, for the perfect balance of flavor and tang. Heinz, uncommon quality since 1869. heinz.com. Questions or comments? Call 1-800-255-5750.