The NHMRC Nutrient Reference Values give different recommended dietary intakes for adults by age and sex. They also give a separate upper level for magnesium from supplements. Those two figures answer different questions.
An RDI is a reference for total daily intake, including food. It is not an instruction to obtain the full amount from a supplement.
| Age | Men | Women |
|---|---|---|
| 19 to 30 years | 400 mg | 310 mg |
| 31 years and over | 420 mg | 320 mg |
Pregnancy, lactation and younger ages have their own reference values. See the full NHMRC tables rather than applying this adult summary to those groups.
NHMRC lists a 350 mg/day upper level for adults aged 19 and over as a supplement. The source says this does not include magnesium naturally occurring in food. The upper level is not a target or a recommended dose. It was set using diarrhoea as the critical endpoint for excess non-food magnesium intake.
Read the upper-level table and rationaleThese examples show the elemental magnesium printed for one tablet in the checked source. They are label comparisons, not suggested daily intakes. A product's directions may differ from this one-tablet display unit.
| Selected product | Elemental magnesium per tablet |
|---|---|
| Blackmores Magnesium | 150 mg |
| Healthy Care Magnesium Glycinate | 160 mg |
| Fusion Magnesium Advanced | 200 mg |
| Nature's Way High Strength Magnesium 600 mg | 321.65 mg |
Check each product record for the selected pack, source, other ingredients and current retailer price. Food intake and other supplements are outside this table.
This page reports NHMRC figures and source-backed label entries. It cannot determine an individual's magnesium needs or whether a supplement is appropriate. If you take medicines, have a health condition, or are considering a product whose label unit is near or above the supplement upper level, ask a GP or pharmacist for personal advice.