Sodium hexametaphosphate, which is identified in the European Union as E452i, is a chemical you will sometimes find listed on the label for fruit juices that contain pulp. This high-phosphorus compound keeps the pulp mixed in the juice so it doesn't all settle to the bottom—or at least it's supposed to. There are not any serious health effects associated with this additive unless you have kidney disease and you need to limit your consumption of phosphorus. However, if you have a problem with phosphorus, it is likely you will also have a problem with potassium and you would not be drinking fruit or vegetable juices.