Contents of Stanley’s Snake Oil, produced by “Rattlesnake King” Clark Stanley in 1917, as determined by the federal government:
- mineral oil
- 1% fatty oil (presumed to be beef fat)
- red pepper
- turpentine
- camphor
I.e., no actual snake oil. But it’s pretty close to modern-day capsaicin-based liniments, so it may still have worked pretty well as intended.