There is some truth to these products, but they depend upon where you live and what minerals are naturally occurring in the soils in that area.
The main ingredients are salt and trace minerals, both of which can be found a your local feed store. Look up deer mineral lick on youtube, the one with dicalcium phosphate. I find it works well, but mainly spring thru summer.
I rounded up samples of everything my buddies had and placed them around a deer stand about 12 feet apart from each other. All had some activity, but C'mere deer and buck jam both had deer eating holes in the ground to get it. Most of this stuff is hyped up and gimicky.