This sounds like an interesting idea, but I suspect we could do all the double-blind, variable-controlled experiments we want on every cream made, and we'd end up right back where we always do with creams/soaps, and other personal products....wait for it...YMMV.

For anyone who doubts this, just do a search on this forum, or B&B (even more so, much more cream and soap wars over there for whatever reason) for Williams, Tabac, or MWF.