Best gastric ulcer maintenance supplement?

Hi fellow equestrians! I'm looking to hear your opinions on gastric supplements for horses that are prone to ulcers. I have an OTTB who is prone to them and we do a lot to manage his condition so that his ulcers don't come back. However I'm not 100% happy with my current supplement as I'm not sure it's as effective as it could be and it's a bit pricey, so I'm curious about what else is out there.

I currently give him GastroMend XC daily, as well as ensuring as stress-free as possible living situation and 24/7 access to forage. Does anyone have other recommendations for daily support supplements that you've used and found effective? A friend of mine recently mentioned aloe vera juice may be helpful but I've yet to try it.