I have been feeding my 6 piggies, 2 boars and 4 sows, timothy hay, a reputable guinea pig ration that includes vitamin C, daily fresh fruits & veggies for over a year now. I had also been supplementing with daily vitamin C, the Oxbow Daily C. When I ran out of these chewable vitamin C tabs, I made up some of my own using dried fruit powders and vitamin C powder. They loved them.
Then I ran out of my DIY vitamin C supplements, got too busy with life and forgot to make a new batch. Within just a few weeks, one of the boars developed signs of scurvy, which progressed until I finally realized what was happening to him. Quickly I mixed up a new batch of "guinea pig fruit leather" with the vitamin C powder included. Within just 2 days, all the scurvy symptoms reversed, with free feed of the fruit rollups. These tasty, nutritious treats proved that FOOD IS MEDICINE. My little herd was quickly restored to health, and they are all happier for it.
From now on, mixing up a batch of Vitamin C leather will be a priority, right along with providing quality hay, quality pellets, quality daily fresh veggies & fruits, and fresh water.