Mustard seed is actually one of the oldest spices and it definitely take the heat up of your dishes by a few notches. It has a spicy and peppery flavor that goes really well with pungent spices such as chilies and garlic. Mustard seed is great for spicy ground mustard or other mustard types. Brown mustard seeds are loaded with health benefits – one of the most prominent being bone health. They are packed with a mineral called selenium, which helps your bones grow stronger. Mustard seeds also contain anti-inflammatory and antioxidant properties that help with relieving pain in the bones, gums, and teeth.