Our Shilajit is tested in independent labs to make sure contaminants like PCB’s, furans, heavy metals and dioxins are below the limits defined by European Union and California Proposition 65.Our product, Natural Shilajit, does not exceed California Prop 65 limits for safety, the strictest limits on earth. It’s even far more strict than Federal limits. However, vegetables and fruits are exempt from Prop 65 since they can’t possibly pass.