With potassium, a component of natural tears. The extra gentle, pH-balanced formula for rinsing and storing soft contact lenses. Sterile. Not for use as a disinfectant. Toll Free Product Information Call: 1-800-553-5340. www.bausch.com. No sorbic acid and no thimerosal. Sensitive Eyes Plus Saline Solution has a gentle, pH-balanced formula which contains potassium, an ingredient found in natural tears. 100% satisfaction guaranteed (Details inside). Made in USA.