I had a recent visit to the vet and she informed me that my guinea pigs should be given a vitamin c supplement daily. Keep in mind they are normal healthy pigs (not nursing, pregnant, young, ill, or old). I was always under the impression that as long as you feed fresh veggies/fruit daily (which I do) and vitamin c enriched pellets (also do) that a vitamin c supplement wasn't necessary. What are your thoughts on this?