The cheapest most effective calming supplement is feeding Magnesium Citrate at 1500mg per day. Its about $25-30 for a 1 month supply at this rate of supplementation, which you may be able to decrease. A hyper active horse is often caused by nutritional imbalances.
Instead of buying random supplements, it is helpful to learn about equine nutrition and attempt to balance your horses diet to meet his needs. FeedXL is apparently a good resource, I prefer reading independent studies and researching supplements myself. Good luck!
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