Feeding a Guinea Pig: Why Vitamin C Is a Matter of Life and Death
The guinea pig shares a trait with humans that is rare among mammals: its body cannot manufacture vitamin C. It must therefore come from the diet, every single day. A deficiency — known as scurvy — can develop in just a few weeks.
Daily vitamin C requirements
An adult guinea pig needs roughly 10 to 30 mg of vitamin C per kilo of body weight per day, and more for a pregnant female or a convalescing animal. Know the warning signs of deficiency: lethargy, dull coat, swollen joints, stiff gait, small gum haemorrhages. At the slightest doubt, book an appointment with an exotics vet; scurvy responds well to treatment when caught early.
The guinea pig food pyramid
- Unlimited hay (around 80% of the ration): the absolute foundation, covered in detail in our guide to choosing hay for guinea pigs and chinchillas.
- Fresh vegetables (around 10%): red bell pepper, carrot tops, endive, courgette, fresh herbs.
- Extruded pellets fortified with vitamin C: a small handful per day, around 5 to 12 € per kilo.
- Fruit: an occasional treat only, because of the sugar.
Which foods are rich in vitamin C?
Red or yellow bell pepper is the undisputed champion: one slice a day covers a good share of the requirement. Parsley, broccoli and fennel are useful complements, rotated to vary the calcium intake. One caveat: vitamin C is fragile. In budget seed mixes it degrades quickly once the bag is opened; choose pellets with stabilised vitamin C and use up the bag within two months.
Should you add vitamin C to the water?
It’s a widespread but questionable practice: the vitamin oxidises within hours in water and can alter its taste, discouraging the animal from drinking. Direct intake through vegetables is better — or, on veterinary advice, chewable tablets dosed for guinea pigs (5 to 15 € per box). Also make sure clean water is always available, in a bottle or a bowl depending on your animal’s preference. All our rodent food comparisons are available on Planète Pets.
This guide is part of Planète Pets’s Rodents universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.