Aspartame

What this is

Aspartame has been reviewed many times by food-safety agencies. FDA, EFSA, Health Canada, and JECFA continue to allow it under specified conditions or acceptable daily intake levels. The main controversy is cancer hazard versus real-world dietary risk: IARC classified aspartame as “possibly carcinogenic to humans” Group 2B based on limited evidence, while JECFA did not change its acceptable daily intake and FDA stated that it disagrees with IARC’s conclusion as applied to approved food use. People with phenylketonuria, or PKU, need a special warning because aspartame contains phenylalanine. Recent U.S. state policy is moving faster than federal rules: Louisiana enacted school-food restrictions and a QR-code disclosure law that includes aspartame, while California enacted school ultra-processed-food restrictions that may capture foods with nonnutritive sweeteners through later regulations.

Safety Review

The critical endpoints experts review in safety assessments. This is not a prediction of harm.

Cancer risk is disputed across expert bodies. IARC classified aspartame as Group 2B based on limited evidence, while JECFA retained its ADI and FDA/EFSA-style risk assessments do not find approved use to be a safety concern. Separately, phenylalanine release is a concrete concern for people with phenylketonuria, and U.S. labeling requires a PKU warning.