I tried C'mere Deer before it was widely distributed to the General Public. A field trial. Its liquid form was offered to the SC State Biologist who in turn asked me to try it in FL and report.
On a statistically insignificant population of 2 trials, it worked 50% of the time, and worked 100% the first time it was put in the forest. It was my assessment that if a deer were in the vicinity, and that deer would ordinarily travel by the place where the lure was suspended, then the curiosity of the deer would tend to draw it to that scent. Not unlike Pure Vanilla Extract suspended in the forest will draw a doe or buck that is passing by that place.
I spread Deer Cocaine on multiple occasions, adjacent to places where I routinely capture deer on camera eating vegetation, without once seeing the deer dip into the Deer Cocaine. From this I surmise that the deer in my woods do not want or need the minerals that Deer Cocaine purports to provide.
Same can be said about the deer in my woods preferring Iron and Clay peas and Soy Beans over almost every other seed planted. They don't seem to eat clovers, turnips, rye grain, wheat, oats, or sorghum. I have tried others but they didn't grow well or the lack of frost eliminates the sugar rising in the maturing plant keeping them bitter. Dang picky deer is what I think.