One 2017 review of clinical studies having limited quality found that high-dose topical capsaicin (8%) compared with control (0.4% capsaicin) provided moderate to substantial pain relief from post-herpetic neuralgia, HIV-neuropathy, and diabetic neuropathy.
I wonder who decided to try this substance for pain and why. 😮
I dunno, but you can not buy 8% over the counter-and I don’t think I’d want to try it even if I could.
I have also read that capsules can be taken to help if a person is having a heart attack—old preppers tale, but never really looked into that.