In 1933, working in Zürich, Switzerland, Reichstein succeeded, independently of Sir Norman Haworth and his collaborators in the United Kingdom, in synthesizing vitamin C (ascorbic acid) in what is now called the Reichstein process.
Pada 1933, bekerja di Zürich, Swiss, Reichstein berhasil, secara independen dari Sir Norman Haworth dan kolaboratornya di Britania Raya, dalam mensintesis vitamin C (asam askorbat).