Which Sleep Supplements
Actually Work?
We analyzed thousands of clinical studies on sleep supplements. Every claim on SleepCited is backed by peer-reviewed research from PubMed.
Sleep quality affects every aspect of health, yet the supplement market is full of unproven claims. We cut through the noise by analyzing peer-reviewed clinical studies from PubMed, grading each sleep supplement on a transparent A–D evidence scale so you know which ones are backed by real science.
Featured Ingredients
Ashwagandha
adaptogenWithanolides modulate GABA-A receptors and reduce cortisol; triethylene glycol (TEG) identified as sleep-inducing component.
GABA
amino_acidPrimary inhibitory neurotransmitter; oral GABA may act on peripheral/enteric nervous system to reduce arousal.
Glycine
amino_acidActs on NMDA receptors in SCN to lower core body temperature; also an inhibitory neurotransmitter in brainstem.
L-Theanine
amino_acidCrosses BBB and increases alpha brain wave activity; boosts GABA, serotonin, and dopamine without sedation.
Magnesium Glycinate
mineralGABA receptor agonist and NMDA antagonist; glycinate form provides calming glycine co-benefit for sleep.
Melatonin
hormoneEndogenous hormone that binds MT1/MT2 receptors in the SCN, regulating circadian rhythm and sleep onset.
Top Conditions
Anxiety-Related Sleep Problems
70-80% of anxiety disorder patients report sleep problems
Circadian Rhythm Disorder
0.13-0.17% delayed sleep phase; higher in adolescents
Insomnia
10-15% chronic insomnia; 30-35% occasional symptoms
Restless Leg Syndrome
5-10% of adults; 2-3% have clinically significant symptoms
Sleep Maintenance Insomnia
More common in older adults; affects ~15% of population
Sleep Onset Difficulty
15-20% of adults report difficulty falling asleep
Recent Evidence Updates
Popular Comparisons
Latest Research
J Sleep Res · 2017
European guideline for the diagnosis and treatment of insomnia.
Chronobiol Int · 2012
Circadian typology: a comprehensive review.
J Clin Sleep Med · 2017
Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline.
Mov Disord · 2011
The Movement Disorder Society Evidence-Based Medicine Review Update: Treatments for the non-motor symptoms of Parkinson's disease.
Cell · 1981
Regulation of terminal differentiation of cultured human keratinocytes by vitamin A.
J Neuroendocrinol · 2003
Role of melatonin in the regulation of human circadian rhythms and sleep.
Guides & Resources
Pregnancy-Safe Approaches to Better Sleep
Sleep disruption during pregnancy is remarkably common, affecting an estimated 78% of women at some point during gestation. The causes shift throughout pregnancy: first-trimester nausea …
lifestyleSleep Support During Menopause: What Research Suggests
Menopause is one of the most significant and underappreciated disruptors of sleep quality, with research indicating that 40 to 60% of women experience sleep disturbances …
lifestyleManaging Anxiety-Related Sleep Issues with Supplements
Anxiety and sleep exist in a bidirectional relationship that can quickly become a vicious cycle: anxiety makes it harder to fall asleep, and poor sleep …
Evidence Grading System
Every supplement claim on this site is graded on an A–D scale based on peer-reviewed clinical research from PubMed. Our algorithm evaluates study design (RCTs rank highest), consistency of results, sample sizes, and the overall body of evidence. No manufacturer sponsorship influences our grades.
Multiple randomized controlled trials (RCTs) or meta-analyses with consistent positive results and large sample sizes.
At least one RCT with mostly consistent results across studies. Evidence suggests benefit but more research may be needed.
Small studies or observational data with some positive signals. Promising but insufficient for strong recommendations.
In vitro studies, case reports, or pilot studies only. Early-stage research that requires clinical validation.
How It Works
No ads. No sponsored rankings. Just science.
Search PubMed
We search PubMed for every clinical study on supplement ingredients.
Extract Findings
We extract the key findings — sample sizes, study types, and results.
Grade A through F
We grade the evidence like a school report card — from A (strong) to F (negative).
Clear Answer
You get a clear answer in seconds — does this supplement actually work?
Cited Health Network
Explore evidence-based research across multiple health domains.
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FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.