Levulinic acid can be found in both natural and processed foods, such as Chinese quince, papaya, rice, sake, and wheaten bread.
It is manufactured from starch by chemical processes and is used as a masking ingredient.
It is also claimed by the manufacturer to have a good bactericidal efficacy.
Science
1
Zhou, M., Doyle, M. P., & Chen, D. (2020). Combination of levulinic acid and sodium dodecyl sulfate on inactivation of foodborne microorganisms: A review. Critical reviews in food science and nutrition, 60(15), 2526–2531.
2
CIR Safety Comittee. Safety Assessment of Levulinic Acid and Sodium Levulinate as Used in Cosmetics.