Quietex? I think its called.....
We used it on my friends mare a couple times, does the job, but give her time to get it out of her system before really working her. If she's all doped up on calm-vibes, she might not be the most intent on working (just from personal experience!).
If you're going to calm her before hauling, test out how she responds to the product a couple weeks beforehand, some horses will just become relaxed, some will become unstable and therefore unsafe to haul.
Hope I helped somewhat. :s
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