You want a carrier oil or cream so I use whatever arnica cream I have on hand. I'll use aveda active composition to add the essential oils in then mix that into the cream. I like Elemi, Clary Sage, Peppermint, Eucalyptus, Lavender, Sweet Basil, Roman Chamomile, Clove, Helichrysum and Wintergreen. I'll mix a few drops of two or three of the above into the Activ (except wintergreen which is already in there) and then mix that into the cream. I normally always use lavender in any combination and the other two just depend on what is on hand. I usually have a small tub mixed for us and have been doing this since my early 20's when I was close friends to an olympic class rower. I started using it on the horses when I ran out of linament and found it worked.