by providing with your horse with a salt block/ salt lick. this provides plently of minerals. you can also give it special mashes or mixes.
carrots
You buy minerals and add it to the feed, or you get a red(mineral) salt lick that is always accesible to a horse.
There are some essential minerals in the horse's salt lick. There are also some very good suppliments that can be added to his daily food.
i think you should feed it yogurt bites. they are rich in minerals .
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.
You can give the horse a mineral block to lick. These are sold in feed stores and come in many varieties and sizes.
The main thing a horse needs if frequently excercising is electrolytes these are vitamins and minerals that are needed because the horse is losing vitamins and minerals his/her body needs to be healthy.
give them a mineral block or feed them a vet recommended supplement.
a salt/mineral block is a good source of salt and necessary minerals to your horse. This is also a good choice because your horse will be able to get them when needed. You can also add loose minerals to your horses grains or supplements.
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Give it Calorific mash.
A good grazing area and a salt block! :)