I just changed Vets and brought them in for a parasite checkup since I noticed dandruff on one. $200.00 Later, guinea pigs looked good, may have fungal skin problem. Anyway, we were discussing vitamin C. I told him about this site and all the information I was receiving. He was very impressed with how knowledgeable I was on guinea pigs. I liked him also. He seemed pretty intelligent on piggys. He did mention that guinea pigs SHOULD get Vitamin C supplements a few times a day if possible even though they get veggies. Reason is that its better for them to have this vitamin in their system throughout the day because many people give veggies once or sometimes twice and the vitamin is eliminated from their body quickly. He said the more vitamin C the better. You can never overdose a piggy with this. Also said because many people have many pigs its hard to know how much vitamin C each one is getting. He said its better to be safe than sorry. Sounds good to me.