It definetly is used as a preservative.. However.. Just as it is added to sodas and heavy junk foods their is a marketing reason for it. Know anyone who is addicted to sodas but the soda their addicted to is caffene free?
know the reason? Well..sodium benzoate IS a preservative..BUT what they dont have to tell people and dont have to, is that it also acts as an addiction..a chemical addiction. It is extremely addictive so its a bonus marketing ploy for manufacturing foods and drinks. I dont mind seeing it in some animal suppliments because i think after the first couple of difficult tries in getting a kitty or ratte etc. To take the yucky stuff they begin to want it because of the addictive aspects. So in toothpaste situations or nutrient for a pet who wont eat its probably a blessing. As for us humans however..thats another thing!