Like all Mustard Seeds, the Yellow, or White, variety protects from enemies and those who wish you harm. The difference lies in the type of protection. In ancient times, the Yellow Mustard Seed was seen as a symbol of faith. There's an old Methodist adage that says, "With faith the size of a mustard seed, you can move mountains." The yellow mustard seeds can be added to more general protection blends, generally warding off evil and protecting from illness.