AN UNBIASED VIEW OF FARMACY OIL FREE MOISTURIZER

It is somewhat helper ingredient that helps to set the pH in the products being right. It's an alkaline pH and will neutralize acidic ingredients.  It could also perform to be a wetting and dispersing agent helping insoluble particles for example color pigments or inorganic sunscreens (zinc/titanium dioxide) to disperse nice and even in liquids.