The best time to take magnesium glycinate depends on why it is being used. For sleep support, it is commonly taken in the evening, often 30 to 60 minutes before bedtime. For general supplementation, it can usually be taken at any consistent time of day.
There is limited direct evidence showing that magnesium glycinate works better at a specific clock time. Available information suggests that absorption depends more on the form, dose, and digestive tolerance than on whether it is taken in the morning or at night. Magnesium glycinate is often chosen because it is a chelated form and may be better tolerated than some other types.
Taking it with food may help reduce stomach discomfort, especially in people who are sensitive to supplements. If the goal is relaxation or sleep, evening use may make practical sense, but this is based more on how it is used clinically than on strong timing studies.
Magnesium supplements should not be used in high doses or combined with other medications without guidance. A doctor or pharmacist can help confirm the right dose and timing, especially for people with kidney disease, pregnancy, or regular medication use.