Evidence Level
Magnesium Glycinate is a bioavailable form of magnesium that has been studied for its effects on sleep and stress. Abbasi et al. (2012) conducted a double-blind placebo-controlled trial involving 46 elderly participants with primary insomnia, demonstrating that magnesium supplementation significantly improved subjective insomnia severity, sleep efficiency, sleep duration, and melatonin concentration while reducing cortisol levels. This highlights the potential of magnesium in enhancing sleep quality.
Boyle et al. (2017) systematically reviewed 18 studies on magnesium and anxiety, noting a trend toward benefit, particularly in vulnerable populations. However, they emphasized that the evidence quality is low. Held et al. (2002) further explored the effects of magnesium on sleep architecture, showing that oral Mg²+ supplementation improved slow-wave sleep, the most restorative stage, in healthy elderly subjects through EEG monitoring.
The glycinate form of magnesium is particularly favored for its role in sleep and stress due to the additional benefits of glycine. Inagawa et al. (2006) demonstrated that glycine ingestion before bedtime improves sleep quality by promoting peripheral vasodilation and reducing core body temperature, which may enhance sleep onset and maintenance.
Recent studies have also examined the effects of magnesium in combination with other nutrients. Cheung et al. (2022) found that combined magnesium and vitamin D supplementation increased serum 25OHD levels more effectively than vitamin D alone in overweight/obese individuals. However, a subsequent study by Dall et al. (2023) reported that this combination did not improve glycemic control or bone turnover markers despite increasing vitamin D levels.
Overall, the evidence supports the use of magnesium glycinate for improving sleep quality and reducing stress, with additional benefits when combined with other nutrients in specific populations.