The lead limit for all of our calcium products is well below federally adopted USP (United States Pharmacopeia) and California Proposition 65 regulations. The current California lead limit, effective April 1, 1999, allows for a maximum of 1.5 ppm of lead per 1,000 mg of calcium (which is even lower than federal guidelines that allow for a maximum of 3 ppm of lead calculated on calcium carbonate). Please note, because of the chemical similarity between calcium and lead, all calcium supplements have trace amounts of lead in them. Even supplements that report non-detectable amounts may have some lead in them depending on the equipment used. Our equipment for detecting lead is very sophisticated and accurate. It is essential that our equipment be very precise since we have to be able to detect even trace amounts of lead in our products.