For some reason I am a bit leery of heating conditioner in the microwave. What I do is heat some water in the microwave (3 minutes usually gets it boiling), then put my conditioner in a little container in the water once it's out of the microwave. That usually takes another 5 minutes or so to gently heat the conditioner, stirring or shaking every so often. I would add any EOs after I heat. Stir or shake again, then apply.