Assertion: selenium | /r/HasProperty | needed in small amounts
Facets:
value: for good health
type: PURPOSE
value: very
type: DEGREE
Source sentences:
text: Selenium is a trace mineral needed in small amounts for good health, but exposure to much higher levels can result in neurological effects and brittle hair and deformed nails.
text: Although it is only needed in small amounts, selenium is important in antioxidant defense, immune function, thyroid hormone production, and has possible anticarcinogenic effects.
text: Selenium, a naturally occurring mineral, is needed only in very small amounts for good health.