I watched a YouTube video of a K9 Police dog sniffing past all of the commercial scent blockers.
The end result of the video was, they help in a small percentage, but to play the wind was the best alternative.
That being said, I've started using Ever Calm deer heard scent and have had NO bad reactions from any deer downwind or otherwise. The actually seem to be seeking out the other deer that they smell.
I've been using vanilla extract for decades with NO bad reactions. It's a curiosity scent that seems to hold their attention.
Bowhunter57