[BabySnow]

Thank you very much for the friendly explanation Theresaj and Ly&Pigs!
Sorry I didn't know I could do a search AnimalHouse36. I did one and came up with more posts saying the reasons that Theresaj and Ly&pigs gave. So thanks!

It does list salt fairly early in the ingredient list for my pellets. I also checked the ingredients of my yogurt drops (Yogies) and it does list Cultured Skim Milk as an ingredient. I know at least for humans, cultured milk is tolerated by many lactose intolerant people. (The bacteria in cultured milk takes care of some of the lactose) However, lactose intolerant people are supposed to avoid whey, which the Yogies also have.

I sent an email to 8in1, the established company that makes Yogies and one of the makers of salt and mineral wheels. I'll let you know if they reply! It's certainly frustrating when a 100 year old company tells you things are essential for your guinea pig - Quote the Yogies container: "healthy yogurt-drop snack made with easy to digest yogurt" and then a forum of experienced (but relatively anonymous) owners tells you the trusted company is full of poo.