What is best to help thin soles.

Already on biotin, hooves look amazing, hair coat is amazing, just has thin soles. 

I had a mare that had thin soles.  I did not have her in shoes, but if we were going to be on gravel I would put her trail boots on and she never had any problems that way.  

Rickens sole paint!

Someone literally just mentioned this! I am going to give it a try! Thank you!