> Let’s say there is no safe limit for lead. Regardless you’d have to agree that at some point the harm caused by lead becomes irrelevant? If someone has 1 ppt

> Let’s say there is no safe limit for lead. Regardless you’d have to agree that at some point the harm caused by lead becomes irrelevant? If someone has 1 ppt lead in their blood the harm isn’t actually measurable? How does the harm from lead become irrelevant? It takes the role of calcium. Deposits in the bones, slowly and continuously gets back into the bloodstream. Takes the roles of calcium in all of its pathways. It isn't a one time exposure, we are all exposed to it, 300 - 500 times more than earlier humans. > And no, you’re wrong. Lead is excreted (why measure in urine/feces otherwise?). Lead exposure isn’t permanent just like all the other toxins humans are naturally exposed to. Digestive system is not 100% efficient at extracting nutrients. Absorption is 10 - 90%, varies on a number of factor. Everything ingested is excreted. Excreted doesn't mean it is explicitly selected for filtering. Fats, vitamins, proteins, everything is excreted to some degree. > Please stop. You’re twisting facts to suit your own purpose. Looks like you are. I haven't twisted any facts.