Studies on the Vitamin B Complex: Further Indications for the Presence of a Third Factor *

Students of the vitamin B complex now agree on the existence of two physiologically active components, vitamin B1 (B) and vitamin B2 (G).4 From time to time experimental evidence has been presented indicating that these two alone cannot account for all of the properties of the old B complex.8 We present in this paper evidence that a "third factor" is associated with vitamin B1 (B) in a concentrate prepared from rice polishings.