Aspartame converts to formaldehyde in vivo in the bodies of laboratory rats.

The study by C. Trocho et al, sometimes referred to as the "Barcelona report", or the "Barcelona study", because it was conducted by the staff of the Biology Department of the University of Barcelona, clearly shows that aspartame which was labeled with carbon 14 isotope was transformed into formaldehyde in the bodies of the living specimens and that when they were examined later, the radioactive tagged formaldehyde was spread throughout the vital organs of their bodies. This conclusively proves that aspartame does indeed convert to formaldehyde in the bodies of aspartame consumers, and that many of the symptoms reported by victims of aspartame toxicity are indeed those associated with the poisonous and cumulative effects of formaldehyde.

As clearly stated by the title of the report "FORMALDEHYDE DERIVED FROM DIETARY ASPARTAME BINDS TO TISSUE COMPONENTS IN VIVO"