Guinea pigs lack the enzyme needed to synthesise vitamin C on their own, a trait they share with humans and very few other animals. Without a reliable daily source, they develop scurvy, and it happens faster than most owners expect, sometimes within a couple of weeks of inadequate intake.
What scurvy actually looks like
- Swollen, painful joints, often the earliest visible sign
- Reluctance to move, sometimes mistaken for general lethargy
- Rough, dull coat
- Loss of appetite, which then makes everything worse, including intake of vitamin C itself
- Bleeding gums in more advanced cases
Left untreated, it's a genuinely serious, painful condition. Caught early, it's very treatable, which makes daily intake the whole point rather than an afterthought.
Why pellets and diet alone are often not enough
Commercial guinea pig pellets are usually fortified with vitamin C, but the vitamin degrades quickly once the bag is opened, exposed to air, light and humidity, so pellets sitting in storage for even a few weeks can carry far less than the label suggests. Relying on pellets alone, especially from an older bag, is a common and easy-to-miss gap.
The other easy mistake
Vitamin C added to drinking water breaks down within hours and is genuinely unreliable as a sole source, despite being a common suggestion. Direct dietary sources, fresh vegetables and properly fortified fresh pellets, are what actually work day to day.
Making a daily habit trackable
Because vitamin C needs are daily, not occasional, the easiest way to actually stay consistent is having somewhere to note it's been given, the same way any other daily routine works better written down than remembered. Halo's medication and daily log tools work just as well for a supplement routine as they do for prescribed medication.