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Magnesium Cuts Sleep Onset Slightly, Yet Experts Warn Unnecessary Risks

7/8/2026

Summary

Story summary

A recent trial of magnesium bisglycinate showed a modest cut in time to fall asleep.
Spanish nutrition researchers say magnesium is essential yet unnecessary as a supplement for healthy people.
The EU permits claims that magnesium reduces tiredness and supports nerve function, without approving a sleep claim.
High-dose magnesium supplements can cause diarrhea, nausea and abdominal pain, especially for people with kidney disease or on certain medicines.

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Story summary

A recent trial of magnesium bisglycinate showed a modest cut in time to fall asleep.
Spanish nutrition researchers say magnesium is essential yet unnecessary as a supplement for healthy people.
The EU permits claims that magnesium reduces tiredness and supports nerve function, without approving a sleep claim.
High-dose magnesium supplements can cause diarrhea, nausea and abdominal pain, especially for people with kidney disease or on certain medicines.