Some brands -- like Giovanni Rana's --give you the answer right away. "No preservatives" is clearly written on the front of ...

Preservatives are added to multidose medication bottles to inhibit microbial contamination. An assortment of different preservative formulations has been used in ophthalmic medicines and many of ...

Polyquad ® is a detergent-type preservative derived from BAK. Polyquad was formulated in the mid 1980s by Alcon as a preservative for contact lens storage solutions. It was developed because ...