There are many supplements available at the moment, so I would speak to the staff at your local saddlery outlet for advice. Salt licks are good though, and as well as being good supplements, they also keep horses entertained! (My mare chews wood, the salt lick stopped that!)
A salt lick is good.
carrots
A good grazing area and a salt block! :)
You add a salt lick to its diet.
You buy minerals and add it to the feed, or you get a red(mineral) salt lick that is always accesible to a horse.
Give it a salt block... Let it graze... Or get a vet reccomended supplment. :)
You can give the horse a mineral block to lick. These are sold in feed stores and come in many varieties and sizes.
The easiest way is to provide a mineral salt block free choice for your horse to lick. These can be purchased from any reputable farm supply store or horse feed store.
give them a mineral block or feed them a vet recommended supplement.
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Salt lick, you can get a mineral , or salt, lick at you feed store.
Give it Calorific mash.