Eucalyptus has been shown to help treat gastrointestinal problems, pain, inflammation and congestion. If you’re ready to feel great, here are 6 powerful ways eucalyptus crystals can change the quality of your life: • Menthol crystals can be used to alleviate nausea, especially when the nausea is due to motion sickness. This is because peppermint (which is used in making menthol crystals) is a natural carminative herb, meaning it can settle the digestive system. • Homemade air fresheners are easy to make, using menthol crystals, as they leave a wonderfully minty scent without toxic ingredients. • A natural pesticide, you can use it in the garden around honey bee hives to deter tracheal mites, moths, and other insects. • Reduces inflammation from a sore throat • Burning menthol crystals is a great way to reduce the dust mites in your house. It also repels bugs of every kind—one whiff of this stuff and they run for their lives. Put a tablespoon or two in a wax burner and vaporize each room for an hour or two. 13.5 grams.