Magnesium is one of the most common supplements, yet the form on the label changes how well it absorbs and what it is best used for. Buying "magnesium" without checking the form is how people end up disappointed.
The common forms
| Form | Often used for | Notes |
|---|---|---|
| Glycinate | Sleep, relaxation | Gentle on the stomach, well absorbed |
| Citrate | Occasional constipation | Absorbs well; can loosen stools |
| Oxide | Cheap general use | Poorly absorbed; high elemental content |
| Malate | Daytime energy | Often taken earlier in the day |
| L-threonate | Cognitive support | Studied for brain uptake |
Reading tip: the label amount may refer to the compound, not the elemental magnesium. Elemental content is what your body actually uses, so check both numbers.
How to choose
Match the form to the goal: glycinate for evening calm, citrate if regularity is the issue, malate for a daytime option. Start at the lower end of the range and give it a week or two.
Magnesium can interact with certain medications, so check with your clinician if you take prescription drugs, especially for the heart or kidneys.