Some trace elements which are essential for human nutrition: zinc, copper, manganese, and chromium.
D000293:Adolescent; D000328:Adult; D000818:Animals; D002648:Child; D002675:Child, Preschool; D002857:Chromium / Q000502:physiology / Q000633:toxicity; D003300:Copper / Q000502:physiology / Q000633:toxicity; D005260:Female; D005504:Food Analysis; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008345:Manganese / Q000502:physiology; D020149:Manganese Poisoning; D009751:Nutritional Requirements; D011247:Pregnancy; D015032:Zinc / Q000502:physiology / Q000633:toxicity
D002857:Chromium; D008345:Manganese; D003300:Copper; D015032:Zinc