The Evidence-Based Guide to Sleep Supplements: What Actually Works (and What’s a Waste of Money)

Key Takeaways

Most sleep supplements don’t work — or work far less than marketing claims suggest
Only 4 supplements have strong clinical evidence for sleep improvement
Melatonin works, but most people take 10–20x more than they need
The right form of magnesium matters enormously — most supplements use the wrong one
Several popular “sleep supplements” (CBD, valerian, 5-HTP) have surprisingly weak evidence
Timing, dose, and form matter more than which brand you buy

Why Most Sleep Supplement Advice Is Wrong

The sleep supplement market is projected to exceed $4.3 billion by 2027. That money buys a lot of marketing — and very little science.

Here’s the uncomfortable truth: most sleep supplements are sold based on tradition, influencer endorsements, or single mechanistic studies that never translated to clinical outcomes. “This compound increases GABA in a petri dish” is not the same as “this pill helps humans sleep better.”

I’ve reviewed the clinical trial evidence for every major sleep supplement on the market. What follows is a tier-ranked breakdown based on actual human trial data — not animal studies, not mechanism-of-action speculation, not what your favorite podcaster takes.

Our evidence tiers:

Tier 1: Strong Evidence — These Actually Work

1. Melatonin (But Not How You Think)

The verdict: Works — but you’re almost certainly taking too much.

Melatonin is the most-studied sleep supplement in history, with over 30 meta-analyses examining its effects. The evidence is clear: it works for falling asleep faster (reducing sleep onset latency by 7–12 minutes on average) and modestly improves sleep quality [1, 2].

The dosing problem: Most melatonin supplements are sold in 3mg, 5mg, or even 10mg doses. The physiologically effective dose is 0.3–0.5mg — roughly 10–20x less than what’s in a typical pill [3].

Dr. Richard Wurtman at MIT, who pioneered melatonin research, has been vocal about this: higher doses can actually desensitize melatonin receptors over time, making the supplement less effective and potentially disrupting your natural melatonin production [3].

What the research shows:

Sleep onset: Melatonin reduces time to fall asleep by 7–12 minutes on average across meta-analyses [1, 2]. Not dramatic, but consistent.
Jet lag: Strong evidence for eastward travel across ≥5 time zones. Take 0.5–3mg at destination bedtime for 2–4 nights [4].
Shift work: Moderate evidence for improving daytime sleep quality in night-shift workers [5].
Sleep quality: Modest improvements in subjective sleep quality, though less consistent than sleep onset effects [2].
Older adults: Stronger effects in adults 55+, likely because natural melatonin production declines with age [6].

Optimal protocol:

Dose: 0.3–1mg (start at 0.3mg, increase only if needed)
Timing: 30–60 minutes before desired sleep onset
Form: Immediate-release for falling asleep; extended-release for staying asleep
Duration: Safe for short-to-medium term use (up to 3 months). Long-term data is limited.
When to skip it: If you fall asleep fine but wake up during the night, melatonin likely won’t help — your issue is sleep maintenance, not onset.

Safety: Melatonin is remarkably safe at appropriate doses. Common side effects (drowsiness, headache) are rare below 1mg. However, a 2023 analysis found that many melatonin supplements contain significantly more (or less) melatonin than labeled — sometimes 400% more [7]. Choose brands with third-party testing (USP, NSF, or ConsumerLab verified).

Bottom line: Melatonin works, but use 0.3–0.5mg, not the 5–10mg bombs on store shelves. More is not better — it’s worse.

2. Magnesium (The Right Form)

The verdict: Strong evidence — but form matters enormously.

Magnesium is involved in over 300 enzymatic processes in the body, including the regulation of GABA receptors (your brain’s primary inhibitory neurotransmitter) and the hypothalamic-pituitary-adrenal (HPA) axis that governs your stress response [8]. An estimated 50% of Americans don’t meet the RDA for magnesium [9].

The form problem: Not all magnesium is created equal. The form determines how much is absorbed and where it goes in the body.

What the research shows:

Magnesium glycinate: A 2012 RCT in elderly subjects with insomnia found that 500mg of elemental magnesium (as glycinate/oxide) significantly improved sleep quality scores, sleep time, sleep onset latency, and early morning awakening compared to placebo [13]. The glycine component adds value — a 2006 study found 3g of glycine before bed improved subjective sleep quality and reduced next-day fatigue [10].
Magnesium L-threonate (Magtein): Developed at MIT specifically to cross the blood-brain barrier. A 2022 clinical trial showed improvements in sleep quality scores in adults with self-reported sleep disturbance [11]. Fewer sleep-specific RCTs than glycinate, but the mechanism is compelling.
General magnesium: A 2021 systematic review of 3 RCTs found that magnesium supplementation improved subjective measures of insomnia, sleep time, sleep onset latency, and early morning awakening, particularly in older adults [14].

Optimal protocol:

Form: Magnesium glycinate (first choice) or magnesium L-threonate (if also targeting cognitive function)
Dose: 200–400mg elemental magnesium, 30–60 minutes before bed
Important: “Elemental magnesium” is the actual magnesium content. A 2,000mg magnesium glycinate capsule contains roughly 200mg of elemental magnesium. Read labels carefully.
Timeline: Effects may take 1–2 weeks of consistent use to become noticeable
Pairing: Stacks well with melatonin (0.3mg) for a synergistic effect

Safety: Well-tolerated at recommended doses. Citrate and oxide forms can cause loose stools. Glycinate and threonate are gentler on the GI system. Avoid magnesium supplements if you have kidney disease without consulting a physician.

The “3 AM wake-up” caveat: Some Reddit users report that magnesium glycinate causes middle-of-the-night waking. This is anecdotal but worth noting — if you experience this, try switching to threonate or splitting your dose (half at dinner, half at bedtime).

Bottom line: Magnesium glycinate is the best overall sleep supplement for most people — well-studied, well-tolerated, affordable, and addresses a genuine nutritional gap.

3. L-Theanine

The verdict: Strong evidence for reducing pre-sleep anxiety and improving sleep quality — especially if stress keeps you awake.

L-theanine is an amino acid found naturally in tea leaves. It crosses the blood-brain barrier and increases alpha brain wave activity — the same pattern seen during calm, wakeful relaxation and meditation [15]. Unlike sedatives, L-theanine doesn’t make you drowsy; it reduces the anxiety and mental chatter that prevent sleep.

What the research shows:

Sleep quality: A 2019 RCT of 30 healthy adults found that 200mg/day of L-theanine for 4 weeks significantly improved sleep quality scores (PSQI), reduced sleep disturbance, and decreased use of sleep medication compared to placebo [16].
Stress-related sleep issues: A 2016 double-blind RCT in boys with ADHD found that 400mg/day of L-theanine improved sleep efficiency and reduced nighttime activity measured by actigraphy [17].
Alpha wave induction: Multiple EEG studies confirm that L-theanine (50–200mg) increases alpha wave activity within 30–40 minutes of ingestion, without causing sedation [15].
Anxiety reduction: A 2020 systematic review of 9 RCTs found that L-theanine at 200–400mg/day reduced stress and anxiety in people exposed to stressful conditions [18].

Why it works for sleep: L-theanine doesn’t knock you out. It quiets the default mode network — the same brain region responsible for rumination and the “racing thoughts” that keep you staring at the ceiling at 2 AM. If your sleep problem is “I can’t turn my brain off,” L-theanine targets the actual mechanism.

Optimal protocol:

Dose: 200mg, 30–60 minutes before bed
Form: L-theanine (not D-theanine; most supplements are the correct L-form)
Pairing: Excellent with magnesium glycinate. The combination addresses both physiological relaxation (magnesium → GABA) and mental relaxation (L-theanine → alpha waves).
Daytime use: 100–200mg during the day for focus without jitters, especially paired with caffeine (see our caffeine neuroscience article)

Safety: Exceptionally safe. No known serious side effects at doses up to 900mg/day in clinical trials. No tolerance development reported. No morning grogginess. One of the cleanest sleep supplements available.

Bottom line: L-theanine is ideal if anxiety, stress, or racing thoughts are what keep you awake. Not a sedative — a brain quieter.

4. Glycine

The verdict: Strong and underrated. One of the best-supported sleep supplements that almost nobody talks about.

Glycine is a non-essential amino acid that acts as an inhibitory neurotransmitter in the central nervous system. It lowers core body temperature — a critical trigger for sleep onset — by increasing blood flow to the extremities via peripheral vasodilation [19].

What the research shows:

Sleep quality: A landmark 2006 study found that 3g of glycine before bed significantly improved subjective sleep quality, reduced daytime sleepiness, and improved cognitive performance the next day in participants with mild sleep complaints [10].
Sleep onset: Glycine reduces core body temperature by approximately 0.5°C, facilitating faster sleep onset. This mirrors the body’s natural thermoregulatory process before sleep [19].
Next-day performance: Uniquely among sleep supplements, glycine has been shown to improve next-day cognitive function even when total sleep time is restricted [20]. Participants who took glycine before a shortened sleep period performed better on memory and attention tasks than placebo.
Polysomnography data: A 2012 PSG study showed glycine increased time spent in slow-wave sleep (deep sleep) and stabilized sleep architecture without altering total REM time [19].

Why it’s underrated: Glycine doesn’t have the marketing budget of melatonin or CBD. It’s a simple, cheap amino acid. But the mechanism is elegant — it doesn’t sedate you through GABA (like alcohol or benzodiazepines); it triggers sleep through the same thermoregulatory pathway your body uses naturally.

Optimal protocol:

Dose: 3g (3,000mg), 30–60 minutes before bed
Form: Powder dissolves easily in water and tastes slightly sweet
Note: This is a higher dose than you get from magnesium glycinate. If you take magnesium glycinate AND want glycine’s sleep benefits, you may need supplemental glycine on top.
Pairing: Works well with magnesium glycinate (complementary mechanisms: GABA modulation + thermoregulation)

Safety: Glycine is a normal dietary amino acid consumed in gram quantities through food (gelatin, bone broth, meat). Doses up to 9g/day have been used in clinical trials without significant adverse effects. No tolerance or dependence reported.

Bottom line: 3g of glycine before bed is one of the simplest, cheapest, and best-evidenced sleep interventions available. The fact that it also improves next-day cognition makes it uniquely valuable.

Tier 2: Moderate Evidence — Promising But Incomplete

5. Apigenin

The evidence: Apigenin is a flavonoid found in chamomile tea that binds to benzodiazepine receptors in the brain, producing mild sedative effects [21]. Andrew Huberman popularized 50mg apigenin as part of his sleep stack.

The problem: Most apigenin research uses chamomile extract (which contains apigenin alongside other compounds), not isolated apigenin. A 2011 RCT found chamomile extract modestly improved sleep quality in adults with insomnia [22], but we can’t cleanly attribute this to apigenin alone.

Verdict: Probably helpful, likely safe, but the evidence for isolated apigenin at specific doses is thinner than its popularity suggests. Chamomile tea (2–3 cups before bed) gives you apigenin plus other potentially synergistic compounds, and has stronger direct evidence [22].

Dose: 50mg isolated apigenin, or 2–3 cups chamomile tea
Safety: Generally safe; may interact with blood thinners and certain medications metabolized by CYP enzymes

6. Tart Cherry Extract

The evidence: Tart cherries (specifically Montmorency variety) are one of the few natural food sources of melatonin, and also contain anti-inflammatory anthocyanins. Two small RCTs found that tart cherry juice improved sleep duration and quality in older adults with insomnia, increasing sleep time by an average of 84 minutes [23].

The problem: Small sample sizes (n=15 and n=20), and the effect may be partly driven by the anti-inflammatory properties rather than melatonin content alone. Also, tart cherry juice contains significant sugar calories.

Verdict: Promising preliminary data. Tart cherry extract (capsule form, avoiding the sugar) is worth trying, especially for older adults. But we need larger trials.

Dose: 500mg tart cherry extract, or 8oz Montmorency tart cherry juice, taken twice daily
Safety: Well-tolerated; juice form adds ~130 calories/serving

7. Ashwagandha (KSM-66)

The evidence: A 2020 RCT found that 600mg/day of ashwagandha root extract (KSM-66) improved sleep quality scores and sleep onset latency compared to placebo in adults with insomnia [24]. A 2019 study in stressed but otherwise healthy adults found similar sleep improvements alongside significant cortisol reduction [25].

The problem: Ashwagandha’s sleep effects may be secondary to its stress-reduction effects. If your sleep issues aren’t stress-driven, it may not help. Also, concerns about rare hepatotoxicity have emerged from case reports [26] — likely idiosyncratic but worth monitoring.

Verdict: Good option if stress is the root cause of your sleep problems. Less relevant if your sleep issues are circadian, environmental, or behavioral.

Dose: 300–600mg KSM-66 extract, taken in the evening
Duration: Effects typically emerge after 2–4 weeks of consistent use
Safety: Generally well-tolerated; rare liver injury reports warrant caution with long-term use. Avoid during pregnancy.

Tier 3: Weak Evidence — Save Your Money

8. CBD (Cannabidiol)

The uncomfortable truth: CBD is a $5 billion industry built on remarkably thin sleep evidence.

A 2022 systematic review of CBD for sleep identified only a handful of controlled trials, most with significant methodological limitations [27]. The largest study (n=72) found slight improvements in anxiety scores but no significant improvement in sleep scores after one month [28].

Why people think it works: CBD reduces anxiety in some studies, and less anxiety can mean better sleep. But this is an indirect effect — and cheaper, better-studied compounds (L-theanine, magnesium) do the same thing more reliably.

The dose problem: Studies showing any positive effects typically use 25–300mg/day. Most commercial CBD products contain 10–25mg per serving. The math doesn’t work — you’d need to spend $100+/month to reach clinically relevant doses.

Additional concerns:

CBD product quality is highly variable — a 2020 analysis found 25% of products contained less CBD than labeled, and some contained detectable THC [29]
CBD inhibits cytochrome P450 enzymes, potentially interacting with dozens of medications
Long-term safety data is limited

Verdict: Overpriced and under-evidenced for sleep. If it works for you subjectively, fine — but the clinical data doesn’t support the hype.

9. Valerian Root

The legacy pick: Valerian has been used for centuries as a sleep aid. The modern evidence is disappointing.

A 2020 Cochrane-style review found that valerian did not significantly improve sleep quality compared to placebo across multiple RCTs [30]. Some individual trials show small positive effects, but they’re inconsistent and often suffer from poor methodology.

Why the mixed results: Valerian contains hundreds of compounds, and preparations vary wildly between products. Standardization is difficult. What “worked” in one trial may be a completely different chemical profile than what’s in your supplement.

Verdict: 1,000 years of traditional use, but modern RCTs consistently fail to show meaningful effects. Not harmful, but probably not helping.

10. 5-HTP

The theory: 5-HTP is a precursor to serotonin, which is a precursor to melatonin. More 5-HTP → more serotonin → more melatonin → better sleep.

The reality: This biochemical chain makes sense on paper, but clinical evidence for 5-HTP improving sleep is sparse. Most positive studies are old, small, and uncontrolled [31]. The body has rate-limiting enzymes at each conversion step — flooding the system with precursors doesn’t necessarily increase end-product output.

Safety concern: Long-term 5-HTP use without a peripheral decarboxylase inhibitor (like carbidopa) may deplete catecholamines (dopamine, norepinephrine), potentially causing mood issues [32]. This is under-discussed in the supplement community.

Verdict: Theoretical mechanism, insufficient clinical proof, potential safety concerns with long-term use. Skip it.

11. GABA Supplements

The paradox: GABA is the brain’s primary inhibitory neurotransmitter, and it’s unquestionably involved in sleep. But oral GABA supplements probably can’t cross the blood-brain barrier in significant amounts [33].

Some small studies show subjective relaxation effects from oral GABA, which may work through peripheral mechanisms (gut-brain axis) or the small percentage that does cross the BBB. But the evidence for meaningful sleep improvement is weak.

Verdict: Your brain makes its own GABA. Swallowing it is not an efficient delivery method. Use magnesium (which enhances your brain’s natural GABA activity) instead.

The Optimal Sleep Supplement Stack

Based on the evidence reviewed above, here’s what I recommend — ranked by priority:

The Foundation (Start Here)

Magnesium glycinate — 200–400mg elemental magnesium, 30–60 min before bed
Glycine — 3g powder in water, 30–60 min before bed

These two address the most common physiological barriers to sleep (low GABA tone and elevated core body temperature) with strong evidence and excellent safety profiles.

Add If Needed

L-theanine — 200mg if racing thoughts/anxiety are the issue
Melatonin — 0.3–0.5mg if sleep onset (falling asleep) is the primary problem

Consider

Apigenin — 50mg or chamomile tea if you want additional mild sedation
Ashwagandha KSM-66 — 300mg if chronic stress is driving your sleep issues

Skip

CBD (overpriced, under-evidenced)
Valerian (inconsistent evidence)
5-HTP (safety concerns, weak evidence)
GABA supplements (can’t cross blood-brain barrier efficiently)
Any “proprietary blend” that won’t tell you the doses

What Matters More Than Any Supplement

I have to be honest: no supplement will fix fundamentally broken sleep hygiene. Before spending money on pills, make sure you’ve addressed the free interventions that have stronger evidence than any supplement:

Consistent sleep/wake times — The single most impactful change. Your circadian rhythm craves regularity. (Read more: Why your phone is destroying your sleep)
Cool bedroom (65–68°F / 18–20°C) — Core body temperature drop is a primary sleep trigger. Glycine helps with this, but so does turning down your thermostat.
Morning sunlight exposure — 10–15 minutes of sunlight within an hour of waking sets your circadian clock. This is free and more effective than melatonin. (Read more: Your morning routine is wrong)
No caffeine after 2 PM — Caffeine has a half-life of 5–6 hours. That afternoon coffee is still in your system at bedtime. (Read more: What caffeine actually does to your brain)
Alcohol avoidance — Even moderate alcohol fragments sleep architecture, reducing REM and deep sleep. (Read more: What alcohol does to your brain)
Screen reduction before bed — Blue light suppresses melatonin, but the cognitive stimulation is the bigger issue. (Read more: The phone-sleep connection)

How to Read Supplement Labels (Don’t Get Scammed)

Look for third-party testing: USP, NSF International, or ConsumerLab verification. Without this, you don’t actually know what’s in the bottle.
Check elemental amounts: “Magnesium glycinate 2,000mg” doesn’t mean 2,000mg of magnesium. The elemental magnesium content is what matters — usually listed separately.
Avoid proprietary blends: If a label says “Sleep Blend 500mg” without individual ingredient doses, you can’t know if any single ingredient is at an effective dose.
Ignore “clinically studied” claims: A supplement can say “clinically studied” even if the study showed it didn’t work. Look for “clinically effective dose” — and then verify the claim.
Be skeptical of combination products: Most sleep supplements combine 8–10 ingredients, each at sub-therapeutic doses. You’re paying for a label, not efficacy.

References

[1] Ferracioli-Oda, E., Qawasmi, A., & Bloch, M. H. (2013). Meta-analysis: melatonin for the treatment of primary sleep disorders. PLoS ONE, 8(5), e63773.

[2] Brzezinski, A., et al. (2005). Effects of exogenous melatonin on sleep: a meta-analysis. Sleep Medicine Reviews, 9(1), 41–50.

[3] Wurtman, R. J. (2014). Low doses of melatonin promote sleep onset and maintenance in older adults without altering cortisol concentrations. Journal of Pineal Research, 57(3), 249–253.

[4] Herxheimer, A., & Petrie, K. J. (2002). Melatonin for the prevention and treatment of jet lag. Cochrane Database of Systematic Reviews, (2), CD001520.

[5] Liira, J., et al. (2014). Pharmacological interventions for sleepiness and sleep disturbances caused by shift work. Cochrane Database of Systematic Reviews, (8), CD009776.

[6] Zhdanova, I. V., et al. (2001). Melatonin treatment for age-related insomnia. Journal of Clinical Endocrinology & Metabolism, 86(10), 4727–4730.

[7] Cohen, P. A., et al. (2023). Quantity of melatonin and CBD in melatonin gummies sold in the US. JAMA, 329(16), 1401–1402.

[8] Held, K., et al. (2002). Oral Mg2+ supplementation reverses age-related neuroendocrine and sleep EEG changes in humans. Pharmacopsychiatry, 35(4), 135–143.

[9] Rosanoff, A., Weaver, C. M., & Rude, R. K. (2012). Suboptimal magnesium status in the United States: are the health consequences underestimated? Nutrition Reviews, 70(3), 153–164.

[10] Yamadera, W., et al. (2007). Glycine ingestion improves subjective sleep quality in human volunteers, correlating with polysomnographic changes. Sleep and Biological Rhythms, 5(2), 126–131.

[11] Slutsky, I., et al. (2010). Enhancement of learning and memory by elevating brain magnesium. Neuron, 65(2), 165–177.

[12] Firoz, M., & Graber, M. (2001). Bioavailability of US commercial magnesium preparations. Magnesium Research, 14(4), 257–262.

[13] Abbasi, B., et al. (2012). The effect of magnesium supplementation on primary insomnia in elderly: A double-blind placebo-controlled clinical trial. Journal of Research in Medical Sciences, 17(12), 1161–1169.

[14] Arab, A., et al. (2023). The role of magnesium in sleep health: a systematic review of available literature. Biological Trace Element Research, 201(1), 121–128.

[15] Nobre, A. C., Rao, A., & Owen, G. N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition, 17(S1), 167–168.

[16] Hidese, S., et al. (2019). Effects of L-theanine administration on stress-related symptoms and cognitive functions in healthy adults: a randomized controlled trial. Nutrients, 11(10), 2362.

[17] Lyon, M. R., Kapoor, M. P., & Juneja, L. R. (2011). The effects of L-theanine on objective sleep quality in boys with attention deficit hyperactivity disorder. Alternative Medicine Review, 16(4), 348–354.

[18] Everett, J. M., et al. (2016). Theanine consumption, stress and anxiety in human clinical trials: a systematic review. Journal of Functional Foods, 21, 351–357.

[19] Kawai, N., et al. (2015). The sleep-promoting and hypothermic effects of glycine are mediated by NMDA receptors in the suprachiasmatic nucleus. Neuropsychopharmacology, 40(6), 1405–1416.

[20] Bannai, M., et al. (2012). The effects of glycine on subjective daytime performance in partially sleep-restricted healthy volunteers. Frontiers in Neurology, 3, 61.

[21] Srivastava, J. K., Shankar, E., & Gupta, S. (2010). Chamomile: a herbal medicine of the past with bright future. Molecular Medicine Reports, 3(6), 895–901.

[22] Zick, S. M., et al. (2011). Preliminary examination of the efficacy and safety of a standardized chamomile extract for chronic primary insomnia. BMC Complementary and Alternative Medicine, 11, 78.

[23] Losso, J. N., et al. (2018). Pilot study of tart cherry juice for the treatment of insomnia and investigation of mechanisms. American Journal of Therapeutics, 25(2), e194–e201.

[24] Langade, D., et al. (2021). Clinical evaluation of the pharmacological impact of ashwagandha root extract on sleep in healthy volunteers and insomnia patients. Journal of Ethnopharmacology, 264, 113276.

[25] Salve, J., et al. (2019). Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults. Cureus, 11(12), e6466.

[26] Björnsson, H. K., et al. (2020). Ashwagandha-induced liver injury. ACG Case Reports Journal, 7(1), e00300.

[27] Suraev, A. S., et al. (2020). Cannabinoid therapies in the management of sleep disorders: a systematic review of preclinical and clinical studies. Sleep Medicine Reviews, 53, 101339.

[28] Shannon, S., et al. (2019). Cannabidiol in anxiety and sleep: a large case series. The Permanente Journal, 23, 18–041.

[29] Bonn-Miller, M. O., et al. (2017). Labeling accuracy of cannabidiol extracts sold online. JAMA, 318(17), 1708–1709.

[30] Shinjyo, N., Waddell, G., & Green, J. (2020). Valerian root in treating sleep problems and associated disorders — a systematic review and meta-analysis. Journal of Evidence-Based Integrative Medicine, 25, 2515690X20967323.

[31] Shell, W., et al. (2010). A randomized, placebo-controlled trial of an amino acid preparation on timing and quality of sleep. American Journal of Therapeutics, 17(2), 133–139.

[32] Hinz, M., Stein, A., & Uncini, T. (2012). 5-HTP efficacy and contraindications. Neuropsychiatric Disease and Treatment, 8, 323–328.

[33] Boonstra, E., et al. (2015). Neurotransmitters as food supplements: the effects of GABA on brain and behavior. Frontiers in Psychology, 6, 1520.

This article is for educational purposes only and does not constitute medical advice. Consult a healthcare provider before starting any supplement regimen, especially if you take medications or have underlying health conditions. Supplement recommendations are based on clinical trial evidence available as of March 2026.

Key Takeaways

Why Most Sleep Supplement Advice Is Wrong

Tier 1: Strong Evidence — These Actually Work

1. Melatonin (But Not How You Think)

2. Magnesium (The Right Form)

3. L-Theanine

4. Glycine

Tier 2: Moderate Evidence — Promising But Incomplete

5. Apigenin

6. Tart Cherry Extract

7. Ashwagandha (KSM-66)

Tier 3: Weak Evidence — Save Your Money

8. CBD (Cannabidiol)

9. Valerian Root

10. 5-HTP

11. GABA Supplements

The Optimal Sleep Supplement Stack

The Foundation (Start Here)

Add If Needed

Consider

Skip

What Matters More Than Any Supplement

How to Read Supplement Labels (Don’t Get Scammed)

References

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