Substance present in tiny amounts in the body (5,7)
I believe the answer is:
trace element
(Other definitions for trace element that I've seen before include "Constituent present in only small amounts" , "Chemical present in small quantities" .)
I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.