Last week, the California Office of Environmental Health Hazard Assessment (OEHHA), the lead agency that implements California’s Proposition 65, proposed an amendment to the existing regulation requiring: (1) the average concentration of a listed chemical as causing reproductive toxicity (e.g., lead) be based on products from the same manufacturing facility; and (2) the dietary exposure to a listed chemical as causing reproductive toxicity be calculated using the arithmetic mean. If adopted, the proposed changes would overrule the court decision in Environmental Law Foundation v Beechnut Nutrition Corp on how to determine the daily intake of listed chemicals as causing reproductive toxicity. The change could impose additional testing requirements on the industry and could create a more rigid standard for falling within a safe harbor. We encourage food companies to evaluate whether the proposed changes would adversely impact their current Proposition 65 compliance positions.