Medical Disclaimer: Supplements are not regulated like drugs. Third-party testing (NSF, USP, Informed Sport) is essential. Consult a healthcare provider before starting, especially if pregnant, nursing, on medications (sedatives, anticoagulants, immunosuppressants), or have kidney/liver disease.
Grading System
| Grade | Definition | Action |
|---|---|---|
| A | Multiple RCTs, meta-analyses, consistent benefit, clear dosing | Use for indicated condition |
| B | Several RCTs, some inconsistency, or condition-specific benefit | Consider for indicated condition |
| C | Limited human data, mechanistic plausibility, small studies | Experimental; low priority |
| D | No human RCTs, negative trials, or theoretical only | Don’t waste money |
| F | Harmful, contaminated, or fraudulent claims | Avoid entirely |
Grade A: Strong Evidence
1. Magnesium Glycinate / Bisglycinate / Threonate
| Parameter | Details |
|---|---|
| Grade | A |
| Indications | Sleep onset latency, sleep quality, nighttime awakenings, muscle relaxation, anxiety-related insomnia |
| Effective Dose | 200–400mg elemental magnesium (glycinate: ~14% elemental; threonate: ~7% but crosses BBB) |
| Timing | 1–2 hours pre-bed (with or without food) |
| Key RCTs | Abassi et al. 2012 (elderly, 500mg Mg oxide → ↑ sleep time, ↑ melatonin, ↓ cortisol); Mah et al. 2021 (athletes, 350mg Mg glycinate → ↑ sleep quality) |
| Mechanism | GABA-A positive modulator, NMDA antagonist, muscle relaxation, ↓ cortisol, ↑ melatonin synthesis |
| Forms Ranked | 1) Glycinate/Bisglycinate (high absorption, gentle, glycine bonus) 2) Threonate (BBB penetration, cognitive) 3) Taurate (cardiac) 4) Malate (energy) 5) Citrate/Oxide (laxative, poor absorption — avoid for sleep) |
| Safety | Renal impairment: dose adjust/avoid. Diarrhea = too much/too fast. Drug interactions: bisphosphonates, antibiotics, diuretics, PPIs. |
2. Glycine
| Parameter | Details |
|---|---|
| Grade | A |
| Indications | Sleep onset latency, next-day alertness/cognition, core body temperature drop, sleep quality |
| Effective Dose | 3g (3000mg) — dose-dependent in studies |
| Timing | 30–60 minutes pre-bed (empty stomach or with carb snack) |
| Key RCTs | Inagawa et al. 2006 (3g → ↓ SOL, ↑ sleep quality, ↑ next-day alertness); Kawai et al. 2015 (3g → ↑ N3, ↓ core temp); Bannai et al. 2012 (3g → ↓ fatigue, ↑ performance) |
| Mechanism | NMDA receptor co-agonist (glycine site) → permissive for excitatory signaling but net inhibitory in sleep circuits; peripheral vasodilation → core temp drop (sleep onset signal); glycine cleavage system → metabolic regulation |
| Form | Pure glycine powder (cheapest, tasteless, dissolves in water). Collagen = 25% glycine but variable dose. |
| Safety | Excellent. Rare GI upset at >5g. No known drug interactions. Safe in pregnancy (conditionally essential). |
Grade B: Moderate Evidence
3. Melatonin
| Parameter | Details |
|---|---|
| Grade | B (circadian) / C (sedation) |
| Indications (Grade B) | Jet lag (eastward > westward), shift work, delayed sleep phase disorder (DSPD), older adults (>55, ↓ endogenous), blindness (non-24h) |
| Indications (Grade C) | Primary insomnia (small effect: ↓ SOL 7 min, ↑ TST 8 min — meta-analysis) |
| Effective Dose | 0.3–1mg (physiologic). >3mg = pharmacological, ↑ side effects, no added benefit. Extended-release for maintenance insomnia. |
| Timing | 30–60min pre-bed (circadian); per phase-response curve for shifting |
| Key Meta-Analyses | Ferracioli-Oda et al. 2013 (19 RCTs: ↓ SOL 7 min, ↑ TST 8 min); Herxheimer & Petrie 2002 (jet lag: 0.5–5mg effective); Wade et al. 2007 (prolonged-release 2mg >55: ↑ sleep quality) |
| Mechanism | MT1/MT2 receptor agonist → SCN phase shift, ↓ core temp, ↑ sleep propensity. Not a sedative. |
| Safety/Concerns | Label accuracy: ±10–500% (ConsumerLab). Long-term: theoretical endogenous suppression, reproductive axis (animal). Contraindicated: autoimmune, seizure, anticoagulants, pregnancy, depression. Next-day grogginess at >1mg. |
4. Apigenin (Chamomile Extract, Standardized)
| Parameter | Details |
|---|---|
| Grade | B |
| Indications | Sleep onset, anxiety-related insomnia, mild sedation |
| Effective Dose | 50mg standardized extract (≈2.5% apigenin) |
| Timing | 30–60min pre-bed |
| Evidence | RCTs: chamomile extract (270mg 2x/d → ↑ sleep quality in elderly); apigenin binds benzodiazepine site on GABA-A (Ki = 4μM). Preclinical: ↓ locomotor activity, ↑ sleep duration. |
| Mechanism | GABA-A positive allosteric modulator (benzodiazepine site, non-sedating at low dose); ↓ cortisol; mild MAO-A inhibition. |
| Form | Standardized extract (50mg apigenin) > chamomile tea (variable, ~1–5mg/cup). Tea = ritual benefit but unreliable dose. |
| Safety | Asteraceae allergy (ragweed, chamomile) — rare. Theoretical: CYP450 interaction (minor). Anticoagulant caution (theoretical). |
5. L-Theanine
| Parameter | Details |
|---|---|
| Grade | B |
| Indications | Relaxation without sedation, alpha wave ↑, caffeine pairing (↓ jitters, ↑ focus), sleep onset if stress-related |
| Effective Dose | 200–400mg (Suntheanine® patented form) |
| Timing | 30–60min pre-bed (or with AM caffeine) |
| Evidence | RCTs: 200mg → ↑ alpha waves (relaxed alertness); 200mg + 100mg caffeine → ↑ attention, ↓ jitter; Hidese et al. 2019 (200mg 4w → ↓ sleep latency, ↑ quality in stress). |
| Mechanism | Glutamate receptor antagonist (AMPA/Kainate), ↑ GABA, ↑ glycine, ↑ BDNF, ↑ alpha waves (EEG). |
| Safety | Excellent. No sedation, no dependence. GRAS. Safe with caffeine. |
6. Tart Cherry Juice Concentrate (Montmorency)
| Parameter | Details |
|---|---|
| Grade | B |
| Indications | Sleep duration, efficiency, onset (natural melatonin + polyphenols + anti-inflammatory) |
| Effective Dose | 30ml (1oz) concentrate 2x/day (AM + 1h pre-bed) = ~85mg anthocyanins + ~0.1mg melatonin |
| Evidence | Howatson et al. 2012 (30ml 2x/d 7d → ↑ TST 34min, ↑ efficiency 5–6%); Pigeon et al. 2010 (insomnia, 2x/d 2w → ↑ TST, ↓ WASO); Losso et al. 2018 (older adults, 2x/d 2w → ↑ TST 84min). |
| Mechanism | Melatonin (trace) + anthocyanins (anti-inflammatory, ↓ oxidative stress) + tryptophan availability → serotonin → melatonin. |
| Form | Montmorency tart cherry juice concentrate (not sweetened, not from concentrate >30ml). Capsules = variable standardization. |
| Safety | Sugar content (~5g/30ml). Diabetic: account for carbs. Salicylate sensitivity (rare). |
7. Ashwagandha (KSM-66® / Sensoril® Standardized)
| Parameter | Details |
|---|---|
| Grade | B (stress-related insomnia) / C (general) |
| Indications | Stress/anxiety-related sleep onset difficulty, cortisol dysregulation, perimenopausal sleep disruption |
| Effective Dose | 300mg 2x/day (KSM-66® 5% withanolides) or 125mg 2x/day (Sensoril® 10% withanolides) |
| Timing | Chronic: AM + PM (8–12 week cycles, 1 week off) |
| Evidence | Langade et al. 2019 (KSM-66 300mg 2x/d 10w → ↓ cortisol 28%, ↑ sleep quality 72%); Salve et al. 2019 (Sensoril 125mg 2x/d 8w → ↓ stress, ↑ sleep). |
| Mechanism | ↓ Cortisol (HPA axis modulation), GABAergic, ↑ BDNF, serotonin modulation. |
| Safety | Thyroid: may ↑ T4 (monitor if hyperthyroid). Pregnancy: contraindicated. Autoimmune: theoretical stimulation. Sedation: rare. Drug interactions: immunosuppressants, thyroid meds, sedatives. |
Grade C: Limited / Conditional
- Valerian Root: Inconsistent RCTs (preparation variability). Dose: 300–600mg 30–60min pre-bed. Mechanism: GABAergic, adenosine. Avoid: pregnancy, hepatotoxicity (rare), surgery (↑ anesthesia).
- Passionflower: Small RCTs vs. oxazepam (non-inferior for anxiety). Dose: 250–500mg extract. Mechanism: GABAergic.
- Lemon Balm: Small RCTs (↓ anxiety, ↑ calm). Often combined with valerian. Dose: 300–600mg.
- Hops: Sedative (2-methyl-3-buten-2-ol). Beer studies (non-alcoholic beer → ↑ sleep). Dose: 300–500mg. Estrogenic (avoid hormone-sensitive).
- CBD: Anxiety → sleep (indirect). Dose: 25–160mg. No RCTs for primary insomnia. Quality control critical (THC, contaminants). Drug interactions (CYP3A4/2C19).
- GABA (oral): Poor BBB penetration. Use glycine/L-theanine instead. Some report benefit (peripheral GABA-A on vagus?). Dose: 100–750mg.
- 5-HTP: Serotonin precursor → melatonin. BUT: ↓ dopamine, eosinophilia-myalgia syndrome (historical contaminant), serotonin syndrome risk with SSRIs. Avoid for sleep.
Grade D: No Evidence / Waste
- GABA supplements (oral): Doesn’t cross BBB in meaningful amounts. Peripheral effects only.
- Melatonin >3mg: No added benefit, ↑ side effects (grogginess, vivid dreams, hypotension).
- “Sleep blend” proprietary formulas: Underdosed ingredients, no strain/dose transparency.
- Homeopathic sleep remedies: No active ingredient. Placebo only.
Grade F: Harmful
- Kava: Hepatotoxicity (rare but severe). Banned in EU/Canada. If used: noble cultivars only, water extract, <4 weeks, liver monitoring.
- Phenibut: GABA-B agonist, dependence/withdrawal (severe), tolerance rapid. Not a supplement — unapproved drug.
- Tianeptine: Opioid activity, dependence, respiratory depression. “Gas station heroin.” Illegal in many states.
- Etizolam / Flubromazolam / Designer benzodiazepines: Unregulated, potent, dependence, seizure risk on withdrawal.
Decision Matrix: Choose by Symptom
| Primary Symptom | First-Line (Grade A/B) | Second-Line | Avoid |
|---|---|---|---|
| Can’t fall asleep (racing mind, stress) | Magnesium glycinate 400mg + Glycine 3g + Apigenin 50mg | L-Theanine 200mg + Ashwagandha 300mg 2x/d | Melatonin >1mg, Valerian (inconsistent), Phenibut (F) |
| Wake up too early / early morning awakening | Glycine 3g + Tart Cherry 30ml (AM+PM) + Morning light 10k lux | Magnesium 200mg + CBT-I | Melatonin (wrong timing), Alcohol |
| Jet lag (eastward) | Melatonin 0.5mg at target bedtime × 3d + Morning light | Glycine 3g + Light therapy | Sleeping pills, Alcohol |
| Jet lag (westward) | Evening bright light + Melatonin 0.5mg if early wake | Caffeine strategic + Glycine | Melatonin at bedtime (wrong direction) |
| Shift work | Melatonin 1–3mg pre-day-sleep + Bright light at “morning” + Caffeine strategic | Glycine 3g + Modafinil (Rx) for alertness | Chronic melatonin >3mg, Alcohol |
| Older adult (>65) | Melatonin 0.3–1mg + Magnesium 200mg + Morning light + Exercise | Glycine 3g + Tart Cherry | Benzodiazepines, Z-drugs (Beers criteria), Anticholinergics |
| Perimenopause / menopause | CBT-I + Cooling + Glycine 3g + Magnesium 400mg | Ashwagandha 300mg 2x/d (if stress) + HRT (if indicated) | Overheating, Alcohol, Spicy food pre-bed |
| General “optimization” (healthy sleeper) | Morning light + Fixed wake + No caffeine post-12 + Cool room + Wind-down | None needed | Nightly melatonin, “sleep stack” supplements |
How to Choose Quality
- Third-party tested: NSF Certified for Sport, USP Verified, Informed Sport, ConsumerLab.
- Form-specific: Magnesium = glycinate/bisglycinate/threonate (avoid oxide/citrate for sleep). Melatonin = immediate-release 0.3–1mg or prolonged-release 2mg (Rx). Glycine = pure powder. Apigenin = standardized 50mg.
- No proprietary blends: Every ingredient + exact dose disclosed.
- Expiration date + lot number: Probiotics/melatonin degrade.
References
- Abassi B, et al. “Magnesium Supplementation for Insomnia.” J Res Med Sci. 2012;17(12):1161-1169.
- Inagawa K, et al. “Glycine Improves Sleep Quality.” Sleep Biol Rhythms. 2006;4(2):102-106.
- Ferracioli-Oda E, et al. “Meta-Analysis: Melatonin for Sleep.” PLoS One. 2013;8(5):e63772.
- Howatson G, et al. “Tart Cherry Juice Increases Sleep Duration.” Eur J Nutr. 2018;57(3):1017-1025.
- Langade D, et al. “Ashwagandha for Sleep Quality.” Cureus. 2019;11(9):e5724.
- Hidese S, et al. “L-Theanine for Stress-Related Sleep Disturbance.” Nutrients. 2019;11(10):2362.
- ConsumerLab. “Melatonin Supplement Review.” 2024. (Label accuracy testing)