Has anyone used it for a horse with navicular ? If so did you see results? 

I had good results using it for a fracture. I don't have any experience using it with navicular issues, but I wouldn't hesitate to try it - it's expensive, but I think well worth it. 

I tried it on a horse with high ringbone, and did not see any results. 

Tried it years ago on my navicular gelding, whole bucket and nothing changed. It was too expensive to continue with no changes.

My daughter is using it on her mare with the start of navicular along with Osphos.   She just finished the loading dose and now down to the maintenance level.  She'll do xrays in the next couple months to see if theres any change.