Filed from 2 published puzzles

HEMATIN

Set to 2 different clues across 2 published puzzles, most often “Blood pigment” — The New York Times, Saturday, 30 April 2005.

7 letters

Every clue on record, most used first

Blood pigmentonce
The New York Times — Saturday, 30 April 2005
Blood componentonce
The New York Times — Sunday, 7 June 1998

Other answers to these clues

HEME4 letters
PLASMA6 letters
SERUM5 letters