Tree medicine. Cinnamon.
the oil rubbed into the soles of my sandals, keeps them and my feet deodorized, and stimulates warmth in them too.
"In addition to being an antioxidant, anti-inflammatory, antidiabetic, antimicrobial, anticancer, lipid-lowering, and cardiovascular-disease-lowering compound, cinnamon has also been reported to have activities against neurological disorders, such as Parkinson's and Alzheimer's diseases."
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003790/
@ToolPackinMama
actually, not at all. this material absorbs it after about a minute of massaging it in, and it keeps working for over a week. i just washed them this morning and added more. just a couple drops, small drops of oil is sufficient.