In my country I've read about taking turpentine oil on sugar 3-5 drops per day, no more. Also, here they sell it pharmacies - the one which is for health-care purposes.
I have not been using it internally, but as part of home-made ointments (with olive oil, beeswax, herbs, resins, and essential oils) for my sprained ankle, knee and arm. I think it has a warming effect and a pleasant aroma. I use something like 10-5 ml per cup of oil.