What I do is give NuVet supplement every 3 days or so. Just not everyday. It is good to make sure they are getting all the nutrients they need, but yes you dont want to overdose either. NuVet also has some herbal supplements that you won't find in kibble, which is why I still like to give them one twice a week.
But nutritionally, with Fromm, fresh veggies/fruits as treats, you are doing great in the nutrition dept. Your dog probably eats healthier then you do! (Heck I know MINE DO!!!)
Hope that helps!