I buy a lot of stuff from Valley Vet Supply, so I looked at the website. There are 60 options under hoof builders. Appyt is right about Horseshoer's Secret, it's good. Farrier's Formula, Nu-Hoof Maximizer, Grand Hoof, H. B. 15, Command Hoof, and many others would all be good choices. I do recommend something that has biotin, amino acids, omega-3 fatty acid, and other vitamins and minerals, as opposed to just biotin. Most tack shop websites will have a lot of hoof supplement choices, and some have ratings and testimonials.