I believe PEN has fantastic products.
I discovered PEN through my riding instructor and a horse I had who was very stiff. He was helped immensely once he had been on magnesium. He is now retired but I began the same regimen with my new horse who is a naturally supple horse but can be spooky. I used both Focus and MagRestore for her during horse shows and these products help her. I also take magnesium for humans and my sleep is more restful. I believe PEN has fantastic products that help horses and humans achieve balanced magnesium levels.
 - Tracy, CA