I use a bespoke AI/Joint supplement for my horse which I feed on a daily basis (which I think is amazing by the way) and it doesn't have any calming content in it.
When I take my horse out in the trailer I add StepFree to his feed for 3 feeds prior to the event; Bren is lovely, calm and relaxed.
I also used StepFree when Bren was being clipped last Autumn; it's the first time ever that he was able to be clipped up near his head (and on his head) without being twitched; he was lovely and calm. I highly rate the product; and the bespoke joint product too!!!!