Magnesium supplements?

As far as I am aware, the "big brands" you see in most feed places and tack shops have a very small amount of magnesium in them despite what the labels claim. I would go for mag ox as above, or something like Pro Balance/Pro Hoof which has the rest of your minerals in as well.
 
Or, more usefully, find out whether your grazing is magnesium deficient. Ours is, and having seen the difference feeding Pro Balance makes to their hoof quality I will continue doing so...
 
Yes, our calcium is very high so I actually feed much more than say magnitude suggests. I was buying pro earth but just bought some from a different supplier on eBay -cheaper and still 98%.
 
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