In a study by Robert Przybelski of the University of Wisconsin of geriatric patients attending a memory clinic, 40% were deficient in one vitamin (of five that were looked for), and 20% in two.

威斯康星大学的 Robert Przybelski 对前往记忆诊所的老年患者进行的一项研究显示，40% 的患者缺乏一种维生素（所寻找的五种维生素中），20% 的患者缺乏两种维生素。