2. Lemon to Improve Mood

A whiff of citrus can have a dramatic effect on your mood. Research suggests that exposing yourself to a citrus fragrance, in particular lemon oil, will help boost your immune function, regulate hormone levels, and reduce the need to take antidepressants. It's one of the best healing scents for people diagnosed with depression. The good thing is that simply dabbing some lemon balm on your wrist is enough to do the magic.