I am prescribed 70 mg vyvanse a day, and I workout every single day (mostly lifting, but at least 4 days of cardio.) I seem to be making pretty good gains, but I have heard that amphetamines are extremely catabolic. However, the vyvanse doesn't kill my appetite so I still eat alot of protein and good meals and take supplements. How bad is the vyvanse decreasing my muscle? Should I work out in the morning before I take it? Thanks for your help