A healthy drink that many people have because of its high content of beta-carotene is Carrot juice.
It is also an excellent source of B complex, Vitamin A and vitamins such as folate.
It is sweet in flavor to the taste is pretty good as well.
So can guinea pigs drink carrot juice at all?
Yes, but only a very little bit and not any carrot juice that has any additives in it.
Additionally remember that if you give them too much it will give them a stomach ache.
Ideally you should just avoid giving this juice to them as it has more downsides than ups. Instead just stick with giving them fresh water and they will be happy.