If a nutrient does not have a Tolerable Upper Intake Level this means that?

If a nutrient does not have a Tolerable Upper Intake Level (UL), it indicates that there is insufficient evidence to determine a level at which adverse effects may occur. This could mean that the nutrient is generally considered safe at high intakes or that potential risks have not been adequately studied. It doesn't imply that there are no risks associated with excessive intake; rather, caution should be exercised as high doses could still pose unknown risks.