Supplements for better sleep
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Supplements for Better Sleep: A Comprehensive Review
Vitamin D Supplementation and Sleep Quality
Vitamin D and Sleep Disorders
Vitamin D deficiency has been linked to various sleep disorders and poor sleep quality. Research indicates that vitamin D supplementation (VDS) can significantly improve sleep quality. A meta-analysis of intervention studies showed a notable decrease in the Pittsburgh Sleep Quality Index (PSQI) scores with VDS compared to placebo, suggesting better sleep quality . However, the effects of VDS on sleep quantity and specific sleep disorders remain inconclusive and require further investigation 13.
Tryptophan Supplementation for Sleep Improvement
L-Tryptophan and Sleep Quality
L-tryptophan (Trp) is an amino acid known to aid sleep. Studies have shown that Trp supplementation, particularly at doses of 1g or more, can significantly reduce the time spent awake after sleep onset, thereby improving overall sleep quality . However, Trp does not appear to affect other sleep components significantly .
Efficacy of Various Dietary Supplements
Amino Acids, Melatonin, and Vitamin D
A comprehensive review of dietary supplements revealed that amino acids, melatonin, and vitamin D significantly improve subjective sleep quality. The meta-analysis indicated that these supplements could reduce sleep disturbances and enhance sleep quality, although the evidence for vitamin D and melatonin showed high heterogeneity . Further research is needed to confirm these findings and explore the effects of other supplements like magnesium, zinc, resveratrol, and nitrate .
GABA, L-Theanine, and Other Supplements
Other supplements such as gamma-aminobutyric acid (GABA), L-theanine, and Apocynum venetum leaf extract (AVLE) have also been found to ameliorate sleep problems significantly. These supplements can be particularly effective when personalized based on individual life habits and pre-existing sleep conditions .
Plant Extracts for Sleep Disturbances
Valerian, Lavender, and Lemon Verbena
Plant extracts like valerian and lavender have been frequently studied for their potential to improve sleep quality and duration, although results are sometimes conflicting. Lemon verbena extract, in particular, has shown promise in reducing stress and improving sleep quality, with users reporting better rest and increased time in deep sleep stages 56.
Specialized Supplements for Shift Workers
Dietary Supplements and Shift Work
Shift workers often experience sleep disturbances due to irregular working hours. Dietary supplements have been shown to improve sleep quality and daytime function in this population. A meta-analysis indicated significant improvements in sleep quality scores and daytime function among shift workers taking dietary supplements, although more well-designed trials are needed to confirm these findings .
Nutritional Interventions for Athletes
Foods and Beverages for Better Sleep
Athletes often face sleep disturbances due to training schedules and travel. Nutritional interventions, including high glycemic index foods, tart cherry juice, herbal supplements, kiwifruit, and protein, have been shown to improve sleep quality and quantity. However, further research is needed to determine the optimal doses and timing of these interventions .
Corn Leaf Extract and Sleep Quality
UP165 Supplement
UP165, a standardized corn leaf extract, has been clinically proven to improve sleep quality and overall well-being. Participants taking UP165 showed significant improvements in deep sleep time, total sleep time, and sleep quality, along with reduced stress levels and enhanced mood states .
Poly-Gamma-Glutamic Acid and Vitamin B6
Combined Supplementation Effects
The combination of poly-gamma-glutamic acid (γ-PGA) and vitamin B6 has been found to improve sleep duration and quality. This dual supplementation showed significant improvements in sleep status and increased serum serotonin concentrations, suggesting its potential as a functional food component for better sleep .
Conclusion
Various supplements, including vitamin D, L-tryptophan, amino acids, melatonin, GABA, L-theanine, plant extracts, and specialized formulations like UP165 and γ-PGA with vitamin B6, have shown promise in improving sleep quality. While some supplements have robust evidence supporting their efficacy, others require further research to confirm their benefits and optimal usage. Personalized approaches considering individual life habits and sleep conditions may enhance the effectiveness of these supplements.
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