Gerty Guinea PigGerty Guinea Pig is a colourful complete food for cavies. Like humans,guinea pigs cannot generate their own vitamin C and so have to be fed on aspecially formulated food. Gerty Guinea Pig is rich in both protein andvitamin C - essential to keep guinea pigs in peak condition. The UK's no.1guinea pig food contains 11 high quality ingredients to encourage foragingand provide interest to the guinea pig diet.