Simplify the following text for a Grade 6 native English-speaking person.
Original: Very little is known about the toxicity of iridium compounds because they are used in very small amounts , but soluble salts , such as the iridium halides , could be hazardous due to elements other than iridium or due to iridium itself . However , most iridium compounds are insoluble , which makes absorption into the body difficult .
Simplified: Iridium is not needed in the body .