Otherwise known as Ziziphus jujuba, red dates, Korean dates or Indian dates.
They usually come in red or black and are often eaten as a snack or with coffee.
So if we can eat them, can guinea pigs eat Jujubes, and if they can how much of it can they eat?

Let’s have a look at their nutritional data, in particular the phosphorus, sugar, calcium, fat and acidic content.
Fresh jujube fruits.
Nutritional value per 100 g (3.5 oz)
Energyt331 kJ (79 kcal)
Carbohydratest20.23 g
Fatt0.2 g
Proteint1.2 g
Watert77.86 g
Vitamin A equiv.t40 μg (5%)
Thiamine (vit. B1)t0.02 mg (2%)
Riboflavin (vit. B2)t0.04 mg (3%)
Niacin (vit. B3)t0.9 mg (6%)
Vitamin B6t0.081 mg (6%)
Vitamin Ct69 mg (83%)
Calciumt21 mg (2%)
Iront0.48 mg (4%)
Magnesiumt10 mg (3%)
Manganeset0.084 mg (4%)
Phosphorust23 mg (3%)
Potassiumt250 mg (5%)
Sodiumt3 mg (0%)
Zinct0.05 mg (1%)
Percentages are roughly approximated
using US recommendations for adults.
Source: USDA Nutrient Database
As you can see Jujubes contain a hint of phosphorus, calcium, fat and a quite acidic, but also contain a great deal of vitamin c which is fantastic for guinea pigs.
With that information in mind, guinea pigs can eat Jujubes but only 2-3 times a week and not everyday because if their acidic content.
But they are a terrific addition to a guinea pig’s diet.