Nutrients vary from the other chemical components utilized in foods in that they are important for human health. The adverse effects can result if the intake of nutrients is very low, as well as when the intake levels are too high.
The upper intake levels or UL are the amounts that are regarded to be the maximum safe level of intake from food and supplements in combination.
The SUL or safe upper-level values are the maximum intake level of nutrients from the dietary sources, which can be regarded to be in the safe zone. Above the mentioned values the nutrient would become toxic.
