What preservatives does I-N use and why?

We use Sodium Benzoit, Potassium Hydroxide. We choose these preservatives because they generally rank lower in toxicity than conventional preservatives. The rank a 3 on toxicity in the skin-deep database. They are free from any byproducts or contaminants known to cause cancer or reproductive toxicity as listed under Prop 65 State Drinking Water and Toxic Enforcement Act.