Elderberries are grown in temperate to subtropical regions of the world appearing more in the northern hemisphere. They are widely grown for their leaves, flowers and fruit.

Most species of Sabcucus berries are edible when picked ripe and then cooked. Both the skin and pulp can be eaten.

source wikipedia

Can guinea pigs eat elderberries, and if they can, how much of them can they eat?

Lets take a look at their nutritional data and find out a little more.

In particular, their acidic, sugar, calcium, phosphorus, and fat content are particularly pertinent to guinea pigs.

Energy 305 kJ (73 kcal)
Carbohydrates 18.4 g
– Dietary fiber 7 g
Fat 0.5 g
Protein 0.66 g
Water 79.80 g
Vitamin A equiv. 30 μg (4%)
Thiamine (vit. B1) 0.07 mg (6%)
Riboflavin (vit. B2) 0.06 mg (5%)
Niacin (vit. B3) 0.5 mg (3%)
Pantothenic acid (B5) 0.14 mg (3%)
Vitamin B6 0.23 mg (18%)
Folate (vit. B9) 6 μg (2%)
Vitamin C 36 mg (43%)
Calcium 38 mg (4%)
Iron 1.6 mg (12%)
Magnesium 5 mg (1%)
Phosphorus 39 mg (6%)
Potassium 280 mg (6%)
Zinc 0.11 mg (1%)

source wikipedia

As you can see they do contain some phosphorus, a little calcium, have a hint of fat and are a little acidic.

However, they do contain a lot of vitamin c which is great for guinea pigs.

So guinea pigs can eat elderberries and they are pretty good for them. Every two to three days would suffice but because of the of their phosphorus and acidic content they cant be eaten everyday.