Max Kenneth Horwitt (1908-2000) was a nutrition researcher best known for his landmark long-term controlled investigations of human dietary requirements, including studies of B-vitamins and tocopherol, or vitamin E. These studies were executed with advisory committees of the Food and Nutrition Board of the National Academy of Science.

Max Horwitt was born in New York City in 1908. He received his B.S. at Dartmouth in 1930 and his Ph.D. at Yale (Physiological Chemistry) in 1935. Horwitt was the founding Director of the L.B. Mendel Research Laboratory [formerly Biochemical Research Laboratory] at the Elgin State Hospital in Illinois. He worked at the Elgin State Hospital from 1935-1968. Dr. Horwitt then became was a Professor of Biochemistry at the St. Louis University School of Medicine from 1968-1976.