Prop 65 is a mandated statement that requires all California-based companies to add a notice to their label or website that the product may contain metals that in large quantities might be harmful to humans. It's worth noticing that most natural products may have trace amounts of metals -- which naturally occur in the food. According to Prop 65, if a company recommends a specific serving size (which we do), the warning has to be displayed when products are sold in California (which we also do!). This statement is not required in any other state or country in the world. We source only the purest natural ingredients and test all products to make sure they are safe and clean.