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 there is insufficient data to establish a value for the nutrient. This means that scientists and nutrition experts do not have enough evidence to determine a maximum daily intake level beyond which the nutrient could potentially cause adverse health effects.

What Does the Absence of a Tolerable Upper Intake Level