Small Pet Health
Guinea Pig Vitamin C — UK Scurvy Guide
By Kaiser Khan, EditorPublished Last updated 4 min read
Quick answer
Guinea pigs cannot make their own vitamin C and must get it from food every single day. According to the PDSA, each guinea pig needs a teacup of vitamin-C-rich vegetables daily, a tablespoon of guinea pig pellets, and unlimited hay. Without it they develop scurvy — painful joints, lameness and a rough coat.
Key takeaways
- Yes. According to the PDSA, guinea pigs cannot produce their own vitamin C, so they must get it from food — a teacup of vitamin-C-rich vegetables per pig per day, plus guinea pig pellets and unlimited hay.
- According to the PDSA, overdosing is very unlikely if you feed a balanced diet and follow the guidelines on any supplement packaging. More is not better — stick to the recommended amounts.
A wider perspective: responsible animal rescue information from the non-profit World Animal Rescue Network.
Why guinea pigs need daily vitamin C
According to the PDSA, guinea pigs are unusual among mammals in that they cannot produce their own vitamin C — just like humans. Vitamin C is essential for healthy skin, gums, joints and wound healing, and for a working immune system.
Because their bodies can't make or store it well, the supply must come from food, every day. A diet that falls short leads to scurvy — a painful, debilitating deficiency disease that also leaves guinea pigs vulnerable to other infections.
How much do they need each day?
According to the PDSA, a healthy daily diet for each guinea pig is:
- 85–90% hay and grass — unlimited timothy or meadow hay for teeth and gut health (never lawnmower clippings)
- One teacup of fresh, guinea-pig-safe vegetables and herbs — chosen for high vitamin C content; split between morning and evening if you like
- One tablespoon of guinea pig nuggets — a complete pellet formulated with vitamin C, not a muesli-style mix
- Constant fresh water — bottle or bowl, refreshed daily
Never feed rabbit pellets — they contain no added vitamin C.
Best vitamin C foods
| Food | Notes |
|---|---|
| Red and green bell peppers | Among the richest safe sources; PDSA-recommended |
| Kale | High in vitamin C — feed in rotation, not daily |
| Parsley | Good source — small amounts |
| Red cabbage | Good source, well tolerated |
| Spinach | Vitamin C rich — small amounts in rotation |
| Coriander and other fresh herbs | Variety keeps picky pigs interested |
The PDSA advises against potatoes, onion, garlic, mushrooms, avocado, rhubarb, chives, iceberg lettuce, and tomato leaves or vines — the tomato fruit itself is safe.
Signs of vitamin C deficiency (scurvy)
According to the PDSA, a lack of vitamin C causes scurvy, with symptoms including:
- Tiredness and lethargy
- Weight loss and reduced appetite
- Swollen, painful joints — a stiff, sore or "bunny-hopping" walk
- Rough, thinning coat and flaky skin
- Sore or bleeding gums
- More frequent infections — the PDSA notes guinea pigs low in vitamin C are more at risk of problems such as respiratory infections
See your vet promptly if you spot these signs — scurvy is usually reversible with treatment and diet correction, but it worsens the longer it's left.
Pellets, storage and supplements
- Pellets lose vitamin C over time — heat, sunlight and long storage break it down. Buy small bags, store cool and dry, and don't use stale food
- Fresh greens are the most reliable source — pellets should back up, not replace, the daily teacup of veg
- Supplements — if your vet recommends one, follow the packaging guidelines; according to the PDSA, overdose is very unlikely when you do
- Change foods gradually — the PDSA advises transitioning over two to four weeks to avoid tummy upsets
When to see the vet
Book a prompt appointment for stiff movement, swollen joints, weight loss, or a pig that's gone off its food. Remember: according to the PDSA, a guinea pig that stops eating is at risk of gut stasis, a life-threatening problem — not eating is always urgent in this species.
For full daily care, see Guinea pig care UK. A swollen, hard belly is a different emergency — read Guinea pig bloat.
Sources & further reading
This guide draws on the publicly available UK advice listed below. Follow the links for the relevant guidance or the organisation's broader care resources.
PETHEALTH+ is independent. These organisations do not sponsor, approve, or partner with this website. Editorial sources and further reading (last updated 2026-07-18).
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Frequently Asked Questions
- Do guinea pigs really need vitamin C every day?
- Yes. According to the PDSA, guinea pigs cannot produce their own vitamin C, so they must get it from food — a teacup of vitamin-C-rich vegetables per pig per day, plus guinea pig pellets and unlimited hay.
- What are the first signs of vitamin C deficiency?
- Tiredness, a rough or thinning coat, weight loss and swollen, painful joints — often first noticed as reluctance to move or a stiff, hopping walk. Deficient guinea pigs also pick up infections more easily. See your vet promptly.
- Can guinea pigs overdose on vitamin C?
- According to the PDSA, overdosing is very unlikely if you feed a balanced diet and follow the guidelines on any supplement packaging. More is not better — stick to the recommended amounts.
- Can guinea pigs eat rabbit food?
- No. Rabbit pellets are not fortified with vitamin C, so a guinea pig fed rabbit food can develop scurvy. Always feed guinea-pig-specific nuggets or pellets.
- Which vegetables are highest in vitamin C?
- Bell peppers — especially red ones — are among the richest safe sources. Kale, parsley, red cabbage and spinach also provide plenty, but rotate them in moderation as part of a varied teacup of daily veg.