Below you can find the Often caused by a lack of iron or certain b vitamins it's the most common disorder of the red blood cells Jeopardy Words Answer. The answer to Often caused by a lack of iron or certain b vitamins it's the most common disorder of the red blood cells has 6 letters. This clue belongs to the Health & medicine category and is part of Jeopardy Word Level 48. If you scroll near the bottom you will find other clues and answers part of level 48