Magnesium is involved in more than 300 enzymatic reactions, including the ones that let muscle fibres relax. That is why the same dose can feel different at 8am and at 9pm.
Form matters as much as timing
Glycinate and citrate are the two forms most people tolerate well. Oxide is cheap and common in drugstore blends, but it is poorly absorbed and pulls water into the bowel.
What the evidence supports
- Sleep quality: modest improvements in small trials, strongest in older adults with low intake.
- Muscle cramps: reasonable evidence for deficiency-driven cramps, weak evidence otherwise.
- Anxiety: preliminary, not a substitute for treatment.
A practical routine
200–300mg of elemental magnesium with dinner, thirty to sixty minutes before bed. If you take prescription medication, check the interaction list first — magnesium binds several drug classes.
