Anyone feed espsom salts to horses and if so for what?  I remember in the day before all the supplements hitting the market we fed espsom salts as a source of magnesium for various reasons.  I asked my husband to pick up epsom salt to do a soak on a horse and he picked up the food supplement . I was thinking of supplementing my horse with it.  Cheaper than my current supplement.

HHHMMMM---epsom salts can also be a very powerful laxative, in humans anyway, so I would watch the dosage.

Yes the package gives feeding instructions and what amount not to exceed.

I feed 2 tablespoon 2x per day per vet recommendation for a horse that had impaction colic 

I stomach tube it to colics for that reason !