Unlike many other brands, Tears Naturale Forte does not contain harsh preservaitves." "Unique Trisorb technology contains 3 ingredients that work together to lock in moisture to bring long-lasting relief to dry eyes. Tears Naturale Forte.
001% as a preservative. Store brand eye drops and even some national brands are still using a preservative called BAC (benzalkonium chloride), which has been shown to be harsher to the surface of the eye with frequent use.1% Hydroxypropyl methylcellulose 0.