Are you paying more than $30/kg for your hoof supplement? Why? 
 
Studies show biotin supplementation improves hoof horn condition and growth. 

Dosage: 1 scoop (provided) contains 250mg copper, 600mg zinc, 3mg iodine in a biotin premix. 1 scoop per day. Use 1.5 scoops for a horse over 600kg.
 
 
Biotin Trace is more palatable than other Sound Advice Trace Mixes. It is perfect for thoroughbreds with flat or flaky feet, and fussy eaters.
 
 
Sound Advice Trace Mixes may assist horses who are showing symptoms of deficiencies in copper, zinc and iodine.

Copper: 

Copper has a role in the central nervous system, melanin and collagen, metabolising iron, in blood, bone, tendons and ligaments.
 
Symptoms of copper deficiency include:
Poor coat quality ('rusting').  Abnormalities in bone, cartilage, tendons, ligaments, arterial walls. Anemia.

Zinc: 

Zinc has a role in the central nervous symptom and supports immune function.

Symptoms of zinc deficiency can include: poor coat, mouth ulcers, skin flaking, poor hoof quality, poor fertility, mild anemia (oxidative damage), suboptimial immunity and predisposition to skin infections. 

Iodine:

Iodine is required for healthy thyroid function.

Symptoms of iodine deficiency include: equine metabolic syndrome, insulin resistance.


Biotin:

Biotin supplementation improves hoof horn condition and strength.

(Biotin is added to the Biotin Trace Mix only).
 
Read more about biotin supplementation here.

More information about trace minerals can be found here:

https://www.ncbi.nlm.nih.gov/pubmed/9622322

http://jn.nutrition.org/content/132/6/1767S.full
http://jn.nutrition.org/content/127/6/1214.full

http://onlinelibrary.wiley.com/doi/10.1111/jvim.12051/epdf

http://www.mitchellplainfarm.com/uploads/2/9/4/4/2944849/pagan_micromineral_requirements.pdf

https://www.ncbi.nlm.nih.gov/pubmed/8202678
 
https://www.americanfarriers.com/articles/8045-is-there-any-new-data-dealing-with-the-need-for-biotin-in-the-hoof-afjho