Short back round I bought back an older gelding that has won a bunch for me and others since he was 5 now 14. This horse does have some maintance issues ( gut,known bleeder) I had him vetted after I bought him and found nothing that I didn't already know. So here is the problem I am having a brain problem with him he running his race in his head before he gets in the pen. He gets himself so worked up before he goes in that he just being a jerk going in and to the first can. Now I know this is NOT a training issue this horse knows what to do. This is a brain issue. So what I am looking for is a feed or supplements that have calming effect. I don't want to revert to drugs thou he  could use a zanex LOL. Thanks in advance

I would give the plantacea CBD pellets a try! I don't have one I need to use them on but I have heard nothing but excellent and consistent results from people with horses described just like yours! Might be worth a try. 

What are you feeding now? 

I really like Quessence and or B1 Crumbles, it needs to get in their system befor you really see good results. Or a good magnesium supplement will help alot with a nervous or high strung horse, thats what I like about Quessence, look it up. 

Woodies sales perp for weight gain he came to me a little light on wieght.

I thought this was interesting You might check it out........

I put my mare on AE Magnesium and CBD Oil and Feeding KoolSpeed 

Magnesium is often the most neglected mineral in horse feeds. Spring grass is typically deficient in magnesium due to the fast growth rate and at this time of year many horses seem hotter and more difficult to ride. Owners often attribute this to too many carbohydrates in the grass. While this may be part of the story, what is often overlooked is that these horses may be deficient in magnesium. Magnesium deficiency has varying effects on the horse population. Some horses do not suffer any signs while others are almost unrideable due to their apparent silliness and hyperactivity. Adding magnesium to their diet may have a dramatic calming effect. To understand why magnesium affects the horse in a calming manner, it is important to know what is happening in your horse’s body on a cellular level when there is a magnesium shortfall.

Good  read!!

I use Ulc-R-Aid.  Great results for my gelding. 

I like adding magnesium but also be sure his gut issue is under control . I am using cbd pellets and also NRF2 has helped one we had who was having anxiety issues. He had sore feet and a gut problem. He has won  the 1D 9 of his last 10 races since starting it.  Magnesium is a cheap thing to try.

I’m not familiar with the feed you’ve got him on - but if it’s a higher carb feed consider trying one that is lower carb/higher fat.  Just like people, they’re all different.  3 of ours get along just fine on Purina Strategy, but my finished gelding has really flourished on Purina Impact Professional.  He feels great and seems to keep a leveler head.

We’re trying another one on Planteca CBD as well to see if he can mentally return to barrels for me.  Fingers crossed, we’re going to town Thursday to see what happens.  He’s had a year off of running barrels and we’ve fixed his body.  Gotta fix his brain.

I also agree with the magnesium comments, but I like to look at the whole program instead of throwing a supplement in top of what might not be the ideal feed to start with.

If you have been to one of my nutrition talks you have heard me say this. "We feed horses into trouble, then try to supplement them out of it". Consider your overall diet before supplementation. There have been some good comments above on calming. However, many of those issues go away with a fully functional digestive system.

I looked up this feed and Holy Moly that is really hot sweet feed, I would take this horse of yours off of it and find you a low strach low sugar feed to put him on. Look up BlueBonnet or triple Crown they have a feed for a horse like yours or just a good pelleted feed, with all that this feed has in it that you are feeding would make a good calm horse high in my opinion..

Allready did after last week end. Going to a low carb high fat feed. Also having Vet run a trace mineral panel on him.