Wondering if there are established safe limits on:
Benzyl Nicotinate
camphor
menthol
wintergreen
various peppers
I would like to make a tingling spray and am asking in the DIY here since at least three (or maybe all) are used in perfume. A pain relief balm I have has 11% camphor and 11% menthol, I don't see toxicity reports for adult humans for those two.

Can I mix all above with magnesium chloride and water, or should I just stick to an alcohol?

Is all wintergreen today pretty much methyl salicylate? I do see limits on that.