ide, Sodium Hydroxide.
That last ingredient is LYE!!!>
oh don't get bent -- go read your CLEAR EYES or any other eye drops. It's in there in such a minute amount it's not even funny- and used to pH balance the solution so it matches your body.....
glycerine is a natural product as is the cellulose, water and the sodium chloride (salt - you know as in your blood and tears .... and nasal membrane moisture....)
the zinc stuff works - believe me -- I've tried it... Cheryl of DRAGON BEADS Flameworked beads and glass