What does the absence of a tolerable upper intake level (UL) for a specific nutrient indicate?

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The absence of a tolerable upper intake level (UL) for a specific nutrient indicates that insufficient data exist to establish a value for the nutrient. It does not necessarily mean that all food sources contain acceptable levels of the nutrient or that it is safe to consume the nutrient in any amount. Caution may be required when consuming supplements of the nutrient, but this is not the only implication of an absent UL value.

What Does the Absence of a Tolerable Upper Intake Level