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Yes, guinea pigs can eat kale a few times a week. Half to one leaf per guinea pig is a good portion. Kale is one of the richest everyday sources of vitamin C, but it is also high in calcium, which can add to bladder stones, so the RSPCA treats it as a few-times-a-week food rather than a daily one.
| Safe? | Yes, with limits |
| How much | Half to one leaf per guinea pig |
| How often | Two or three times a week |
| Best served | Raw, washed, torn into pieces |
| Watch out for | Too much calcium; gas in some guinea pigs |
Is kale good for guinea pigs?
Yes, in the right amount. Worked out from the Guinea Lynx food chart, kale has about 120 mg of vitamin C per 100 g (3.5 oz), around twice as much as an orange, with very little sugar. Guinea pigs can't make their own vitamin C, so foods like this matter.
The problem is calcium. The same chart puts kale at about 135 mg of calcium per 100 g, many times more than peppers or cucumber. PetMD lists kale among the higher-calcium vegetables to offer only now and then, and The Vet Desk, a vet-reviewed guide, links high calcium to the bladder stones guinea pigs are prone to. Kale is also a crucifer, part of the cabbage family, which can cause gas in some guinea pigs.
How much kale can a guinea pig have?
Half to one leaf per guinea pig, two or three times a week. Burgess suggests half a curly kale leaf as one day's serving in a mixed bowl, and The Vet Desk says one or two leaves depending on size, several times a week at most. Because sources vary, we'd follow the smaller Burgess portion and build the rest of the day's cup of veg from low-calcium greens such as romaine lettuce and peppers.
How to prepare kale
- Wash it well. Curly kale traps grit in its folds, so swish it in cold water and shake it dry.
- Tear it up. Tear the leaf into pieces and thinly slice any thick stem.
- Mix it in. Add it to the day's greens rather than feeding it on its own.
- Clear up. Take out wilted leftovers within a few hours.
Stems, types and cooked kale
- Stems: safe raw; slice thick ones.
- Curly, purple, red Russian and cavolo nero (lacinato): all fine, fed the same way.
- Baby kale in salad bags: fine, but pick out other leaves you aren't sure of.
- Cooked kale or kale crisps: no.
Who should avoid kale?
Guinea pigs that have had bladder stones or sludgy, gritty urine should have little or no kale, as should those on a high-calcium diet such as alfalfa hay. Guinea pigs prone to gas should also skip it. Blood in the urine or straining to wee needs a vet visit within a day; see our guinea pig health guide.
What to offer instead
For daily vitamin C with less calcium, bell peppers are the top pick. Spinach, cabbage and broccoli follow a similar few-times-a-week rule. Our vitamin C guide, the safe food list, the guinea pig diet guide and our guinea pig care guide cover the rest.
Kale questions
Can guinea pigs eat kale stems?
Yes, raw kale stems are safe, but they are tough and fibrous. Slice thick stems thinly so they are easy to chew, or strip the leaf off and give the stem only if your guinea pig likes crunching it. They count towards the kale portion for that day.
Can guinea pigs eat purple or red kale?
Yes. Curly green, purple, red Russian and cavolo nero (lacinato or Tuscan kale) are all the same plant and are fed the same way. A vet-reviewed guide at The Vet Desk confirms guinea pigs can eat both green and purple kale. Keep to the same small, few-times-a-week portion.
Can guinea pigs eat kale every day?
No. The RSPCA puts kale in its treat group, a few times a week, rather than the vegetables to feed daily. Kale is high in calcium, and guinea pigs are prone to bladder stones, so it is best as a regular but not daily part of the bowl.
Can guinea pigs eat kale crisps or cooked kale?
No. Kale crisps are baked with oil and salt, and cooked kale loses some of its vitamin C and its crunch. Guinea pigs should only have fresh, raw, washed kale with nothing added.
