The carbopol used is approved for use in food as an ingestible. It is also used in medicinal syrups for infants. It is present as a fraction of a percentage of the total formula content, used only for engaging the liquid into a gel consistency for appropriate and prolonged topical application. The sodium hydroxide is a common ingredient used to adjust the product pH close to skin pH. The small amounts of sodium hydroxide added react completely to form a neutral pH environment that is safe for skin