old PPID horse with 1/2 Prascend, ACTH 4,8 (before 204). Apatic. Horse owner gives him Vitex, MSM, vitamin C. In the case of healthy horse should be MSM feed in connection with vitamin C. But in the case of horse with PPID, vitamin C can worsens oxidative damage. MSM feed him because artrosis and stuffiness. Vitex can fight about dopamic receptors with Prascend. So without Vitex, but how with MSM and vitamin C in the PPID horse?