IDK what possesses my aunts to buy prune juice for my grandmother to drink

Seriously she hates it. I.get her natural white grape juice. Same amount of iron and one other thing. And has vitamin C in it. Where prune just says it has 0% vitamin D 😐 like what. And she drinks vitamin D milk anyways. It's stupidness lol. Bah. This was a post about juice (also has less carbs, she's a diabetic)