Thanks for the interest Craig and a good thought.

I don’t think alcohol directly on the skin would have the desired vasodilation effect from what I found. I did look at chemically induced blood flow increase and it is possible, see a research article called. “Camphor Induces Cold and Warm Sensations with Increases in Skin and Muscle Blood Flow in Human” which looks promising. Peppermint also looks a possibility.

I didn’t suggest these for three reasons; firstly it’s harder to control — how long do you want to increase blood flow for?, secondly it’s messy and thirdly would it actually stress the arteries to regenerate or just increase blood flow in those that exist?