The guinea pig that helped humans beat scurvy

Guinea pigs can't make their own vitamin C. Neither can we. That shared flaw changed medicine.

Most mammals manufacture vitamin C in their own bodies — dogs, cats, rabbits, rats, all quietly brewing their own supply. Guinea pigs are one of the rare exceptions. Somewhere deep in their evolutionary past, the gene for it broke, exactly as it did in ours.

So when Norwegian researchers went looking for an animal that would develop scurvy the way sailors did, the guinea pig was the one that obliged. Fed a deficient diet, it grew weak and sore-jointed and bled at the gums — and recovered when fresh food came back. That work helped turn scurvy from a mystery into a nutrient deficiency, and eventually into a vitamin with a name.

Which is why your guinea pig's dinner is not a lifestyle choice. It's biology.

Fresh vitamin C daily, every day of their life: a small handful of bell pepper, a sprig of parsley or coriander, some leafy greens. Unlimited hay and grass stay the foundation. Vitamin C added to drinking water degrades fast and tends to put them off drinking — food is the better route.

Watch for a rough coat, reluctance to move, a crunchy or stiff gait, bleeding gums or a sudden drop in appetite. Those deserve a vet experienced with exotic pets, promptly.

Four hundred years of seafaring misery, solved in part by a small animal with the same gap in its chemistry as us. 🫑