Guinea Pigs cannot produce Vitamin C, on their own, naturally, and are therefore susceptible to a disease known as scurvy. Scurvy can cause gum bleeding, loss of appetite, weight loss, sudden bleeding, painful joints, poor bone and tooth development and eventually death. It is important that your guinea pigs diet is supplemented daily with Vitamin C. An easy way to do this is by adding Oasis Pure-C Vita-drops to your guinea pigs drinking water. This will insure that your little cavy is getting the Vitamin C they need. If you feel that your guinea pig may have scurvy please contact your vet immediately.