Why Are There No Dietary Reference Intakes (DRI) Established for Carotenoids

Why are there no Dietary Reference Intakes (DRI) established for carotenoids?

A) They are not essential for humans.
B) There is insufficient evidence to document safe levels of intake for children and adults.
C) There is insufficient evidence to support their essentiality beyond their role as vitamin A precursors.
D) Carotenodermia is not considered dangerous and is reversible.

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