Reference
Daily nutrient targets
Look up three published figures: folate as dietary folate equivalents, the adult upper limit for supplemental magnesium, and the adult upper limit for preformed vitamin A.
Magnesium · Upper limit
350 mg
Adults
Vitamin A · Upper limit
3000 mcg
Adults 19 and older
Folate · Recommended intake
400 mcg DFE
Adults 19 and older
This shows a published reference. It is not a dose to take and it is not personal medical advice.
Questions
Does the magnesium limit include food?
No. The adult upper limit shown here applies to supplemental magnesium. Magnesium in food is outside that limit.
Does the vitamin A limit include beta-carotene?
No. The upper limit shown here is for preformed vitamin A.
How this number is made
What this result means
Each row names the kind of figure, the unit, the ages it belongs to, and what the limit applies to. The magnesium limit is supplemental magnesium. The vitamin A limit is preformed vitamin A. Folate is in micrograms DFE.
Formula and methodology
The page selects the opened sentence for the life stage you choose. It does not add nutrients that do not have an opened sentence, and it does not turn a missing upper limit into zero.
Worked example
An adult folate row reads 400 mcg DFE. Pregnancy reads 600 mcg DFE. Lactation reads 500 mcg DFE. Magnesium stays 350 mg a day from supplements. Vitamin A stays 3,000 mcg of preformed vitamin A.
Assumptions and limitations
These are reference amounts for the ages named on each row. They are not a personal prescription and they are not a dose to take.
Who should not rely on the result
Anyone looking for a dose to take, or for a nutrient that is not in the three rows, should not treat a blank as zero or as permission to take any amount.
Sources
- NIH ODS magnesium, health professional. Accessed 2026-10-05.
- NIH ODS vitamin A, health professional. Accessed 2026-10-05.
- NIH ODS folate, health professional. Accessed 2026-10-05.