I also have used it quite a bit. I had 1 filly that I bought as a weanling that started to get physitis (she was not on a ration balancer, but a mare & foal grain at her breeder’s place). I consulted Don Kappler and we did give her the rejuvenaide paste at that time in a proper dose/wgt. Then when she came home, he had me up the amounts of the ration balancer by about 0.5 per day over the recommended amount. The physitis resolved just fine and she is now over a year away from when it happened.
Another friend had a mare who was a late yearling who was over at the knee. She had not been on a ration balancer at that time. Owner had tried dynasplint and contacted several vets. She finally contacted Don Kappler and he recommended Rejuvenaide at the recommended dose/wgt for a few months. Mare corrected to 99% straight in her legs within a month or 2 after using the rejuvenaide.