The upper limit is the highest daily intake unlikely to cause harm for most healthy adults. It is a ceiling, not a goal, and it does not apply to people taking a nutrient under a doctor's care.
Enter the amount of the nutrient itself shown on the Supplement Facts panel (for minerals, the elemental amount), not the weight of the whole compound. Nutrients marked "food + supplements" also count what you eat, so your true total can be a little higher than shown.
Education only. Not medical advice, and it does not take the place of advice from your doctor, registered dietitian or pharmacist. Ask them about doses, medicines you take, pregnancy and children.