Yes is vitamin C they are one of the few mammals along with us and certain monkeys that don't produce vitamin c. We had loads as kids we were meant to have two girls but they are quite difficult to sex when young. At one point we had 16 babies at once, a boy mated his mum and three sisters and all gave birth at once you have to separate out boy babies real quick to avoid those issues. Ours were free range in garden so ate alot of grass and exercise but we did supplement with carrot cucumber lettuce but prob not every day in addition to the dry food.