Reynolds plastic wrap and Saran plastic wrap are made from polyvinyl chloride (PVC) (#3 for recycling). This kind of plastic can be unhealthy. I found out that Glad plastic wrap is made from low density polyethylene (LDPE, and #4 for recycling). This kind of plastic has no known hazards. However, Glad's website does say that their plastic wrap contains "proprietary cling agents used at low concentrations which are FDA compliant." So who knows what that is. Even so, I think I feel more comfortable with Glad plastic wrap.