PROP 65 is a California regulation where if there is any potential high levels of heavy metals, pesticides and vitamin A. What is important to note is that this regulation is not supported in 49 States at this moment. In our product, we are referring to the heavy metals found in the four ingredients. The heavy metals (lead and cadmium) in the raw ingredients are found naturally in cacao beans and in the soil due to volcanic flow. Our product is safe to consume when consumed in moderation.
If you would like more information from a third party, here is one from the California State government: http://www.nowfoods.com/Quality/Proposition-65-Warning-FAQs.htm.