Sadly, my vet only sells Science Diet for cats and dogs.
I did, however, just make them a second bowl of veggies to munch on through the afternoon. I've read that bell peppers are high in vitamin C, so I'm glad you confirmed that! I gave them extra bell peppers and a floret of broccoli.
I have most of the stickies in this area printed out and stuck to my fridge
so I'll be referring to them with extra attention.
Thanks for all the information!