Can't guarantee it will work on every horse but worth a try.
My boy was a 'messed up' warmblood who had learn't to avoid issues.
His answer to jumping was to bolt,... would not stand still to be mounted, viz. behave like a spinning top almost literally !!, constantly winding himself into a complete dripping mess !!!!
Other than my son, nobody else had managed to stay on him !!
Gradually after a month on the Think Pink, we found he was willing to discuss issues and work through it.
Now , he has been competing to 1.20m Affiliated classes, stands almost completely still and then is a 'dobbin' to hack out.
Should mention that we have had him nearly three years so the improvement has not happened completely in the last 8 months but whatever he took in prior to the supplement, has now come forward probably because he is able to think straight.