Dollar Stores: Multiple Universes?

I don't like dollar stores.

They creep me out; there's something unsettling about the people who work there (day-time tavern maids), the smell (dirty Rite-Aid), and the products. The thing is about the products - and they have almost everything at the dollar store - is that I don't recognize any of them. There are no recognizable brands in the store, as if these products never really existed. It's like entering a parallel universe, similar to our own universe, but with subtle variations. You can't quite put a finger on the differences until you look closely at the shelves. Surely no one in our universe has bought a ceramic rabbit playing football and put it on their mantel; what kind of power sources does this sister universe use that makes batteries so affordable?

When I force myself to look closely at the food products (perhaps the most disturbing aspect of the dollar store), I expect to find the change in names you see in science fiction novels. For example, in The Golden Compass, a bar of chocolate is called a bar of "chocolatl," as the cultural-linguistic history of the word "chocolate" never occurred in the GC universe. Sure enough, the dollar store universe seems to share most of our important historical events, because the names of ingredients and manufacturing towns are the same.

With that being said, no one has heard of or seen these products. They must be from somewhere/time that never existed in our own universe.

I wonder, then, if it is unnatural to co-exist in multiple dimensions. In this, I mean that if we exist too long in the universe that is not our own, do we put our health at risk, or worse, the existence of these co-existent universes? Many sci-fi stories have concerned theirselves with this conundrum. What happens if I eat this $1 cereal or package of nuts I've never seen? What will happen to my hair if I use this shampoo brand I've never heard of? What happens if I drink this pop that never existed?

Whether this is the case or not, I will not ever enter this dollar dimension long enough to test the quantum limitations.