Herbalife Ltd. asserted the safety of its products on Tuesday, responding to a study by the Fraud Discovery Institute that claimed six of its dietary supplements contained high amounts of lead. The Institute claims the levels of lead found in Herbalife’s supplements exceeds limitations under California law. Herbalife responded in a prepared statement, “Our products fall within Food and Drug Administration suggested guidelines for the amount of lead that consumers can safely ingest through their diet and the FDA sets specific limits on lead content in certain foods. Our products include natural ingredients, and trace levels of naturally occurring lead is present in virtually all natural ingredients. This is not a question of contamination resulting from the manufacturing process or as a result of unsafe handling.” Shares of Herbalife stock have dropped $1.85 since Monday.