Negative ions are odorless, tasteless molecules that are abundant in nature. They are formed when energy causes molecules like oxygen or nitrogen to gain an extra electron. Negative ions can help boost mood, energy levels, and relieve stress by increasing serotonin levels once in the bloodstream. They are incorrectly called "negative" ions due to terminology from the 1700s, when electrons were not fully understood, and an extra electron was termed "negative", even though it should be called a "positive" ion. Negative ions provide several health benefits like reducing respiratory diseases, cancer risk, and depression, while also improving sleep, wound healing, and detoxifying the body.