What oils should you not diffuse?
Yes, avoid diffusing toxic oils like bitter almonds, pennyroyal, sassafras, and wintergreen. Always research an oil’s safety before use, especially if you have allergies or sensitivities. Also, check the diffuser manufacturer’s guide for recommended essential oils. Young children and the elderly may be more sensitive to essential oils. So you may need to dilute them more. And you should totally avoid some oils, like birch and wintergreen. In even small amounts, those may cause serious problems in kids 6 or younger because they contain a chemical called methyl salicylate.