DO hoof supplements really work?

My friends horse used to have terrible feet and she fed him biotin for about 6 months. We only really seen a difference when we changed from cherry chaff sugar beet and coolmix (yes I know!:-O), to a fibre only diet. Also had a farrier change but it was the hoof quality that was the issue. His feet are much better now, farrier still describes them as tricky but I think he means by shape/ balance rather than quality
 
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