I use 99% DMSO sprayed on outside of hooves prevents cracking etc. Also use 20 drops CD in 3 0z 99% dmso and spray Under hoof and ankles and legs around arthritis soaking then rubbing it in. I don't rinse. Walking is improved. Also have used on myself many times 10 CD 10 99% DMSO works great. A person could be allergic to DMSO and skin sensitivites very but this works well for many.