Other trace elements have been observed with phenylketonuria, an inherited metabolic disorder, and kwashiorkor, a severe form of malnutrition that occurs mainly in developing nations.

• 在苯丙酮尿症(一种先天性代谢失调)和恶性营养不良(一种主要发生在发展中国家的严重营养不良)患者的毛发中，也观察到了其它种微量元素。