Magnesium or melatonin: Which supplement is better for improving sleep?

Melatonin and magnesium are among the most widely used sleep supplements, but experts say they serve different purposes and should not be considered interchangeable.

According to neuroscientists, melatonin is a hormone that regulates the body's internal circadian clock. Rather than acting as a sleeping pill, it signals to the brain that it is time to prepare for sleep. Because of this, melatonin is considered most useful for correcting disrupted sleep schedules, such as jet lag or delayed sleep phase.

Magnesium works through a different mechanism. As an essential mineral, it supports hundreds of biochemical processes in the body and contributes to the production of gamma-aminobutyric acid (GABA), a neurotransmitter that helps calm the nervous system and promote relaxation. This makes magnesium particularly beneficial for people whose sleep problems are linked to stress, anxiety or muscle tension.

Research suggests that melatonin can help people fall asleep slightly faster and modestly improve sleep quality, although its overall effects are relatively small. The strongest scientific evidence supports its use for managing jet lag.

Evidence for magnesium is still emerging. Recent studies indicate that magnesium supplementation may improve mild insomnia and anxiety, especially in individuals with low magnesium levels, but further research is needed to confirm its long-term effectiveness.

Sleep specialists emphasize that neither supplement should be viewed as a treatment for chronic insomnia. Persistent sleep problems should be evaluated by a healthcare professional, who may recommend cognitive behavioral therapy for insomnia (CBT-I) or other evidence-based treatments.

Experts also advise against taking excessive doses. Melatonin is generally effective at low doses, typically between 0.5 and 3 mg, taken one to two hours before bedtime. Higher doses do not necessarily improve sleep and may interfere with the body's natural circadian rhythm.

For magnesium, supplemental doses usually range from 100 to 400 mg per day, depending on dietary intake and individual needs. Magnesium glycinate is often preferred because it is well absorbed and less likely to cause digestive side effects than other forms.

Although melatonin and magnesium can be taken together, there is currently no strong evidence that combining them provides greater benefits than taking either supplement alone.

Both supplements are generally considered safe when used appropriately, but they may interact with certain medications and can cause side effects. Experts recommend consulting a healthcare provider before starting either supplement, particularly for people with chronic illnesses or those taking prescription medications.

Follow NEWS.am Medicine on Facebook and Twitter