The Best Supplements for Sleep, Ranked by What the Trials Actually Measured
If you want one answer: for most people who train hard and cannot switch their brain off at night, the best supplement for sleep is magnesium glycinate, and our pick is Thorne Magnesium Bisglycinate — a clean, single-ingredient powder you can dose to taste in the evening, from a brand that manufactures in an NSF-certified facility. That recommendation comes with an honest framing you will not get from the supplement aisle, so read this part first. Sleep supplements are a small lever. The large levers are free: a consistent wake time, morning daylight, a dark cool room, and not drinking caffeine at 4pm. We treat sleep as a performance pillar on this site precisely because of how large that effect is — in a study published in the journal Sleep in 2011, Stanford researchers had collegiate basketball players extend their time in bed, and objective measurement showed they averaged 110.9 minutes more sleep per night. Their 282-foot sprint times fell from 16.2 to 15.5 seconds and free-throw accuracy rose from 7.9 to 8.8 made out of 10. No capsule on this page produces an effect that size, and anything claiming it does is lying to you. What supplements can plausibly do is narrower: make it slightly easier to fall asleep, slightly less likely you wake at 3am wired, or shift your body clock when you have crossed time zones or come off a night shift. Those three jobs need three different products, which is the single most useful thing to understand before you spend money. Magnesium is for the person who is physically restless and whose intake is probably short of the recommended amount anyway. Melatonin is a clock signal, not a sedative — the American Academy of Sleep Medicine's 2017 chronic-insomnia guideline actually recommends AGAINST melatonin for chronic insomnia in adults, while the AASM's separate circadian-rhythm guideline does support it for delayed sleep-wake phase disorder and jet lag. Those two facts sit in the same body of evidence and get collapsed by marketing into 'melatonin helps you sleep.' Tart cherry and glycine sit lower: real but mild. Ashwagandha is the one adaptogen here with sleep trials worth citing, and it is for the wired-and-tired person specifically. We ranked these six on trial evidence for sleep specifically, dose and form matching the studies, label honesty, third-party testing, and value per night, with live Amazon prices below. This is general information, not medical advice — ongoing insomnia, loud snoring, or waking unrefreshed after eight hours is a reason to see a clinician, not to buy a bigger bottle.
Top pick
Thorne — Magnesium Bisglycinate (Powder)
~200 mg elemental magnesium per scoop as magnesium bisglycinate · powder, so the dose is adjustable · single ingredient · manufactured in an NSF-certified facility · unflavored option with no sweetener
Pure Encapsulations — Magnesium Glycinate (Capsules)
At a glance
Tap a row to check price · tap a header to sort| # | Best for | Price | ||
|---|---|---|---|---|
| 1 | 1. Thorne — Magnesium Bisglycinate (Powder)Best overall for sleep | Best overall for sleep | 9/10 | |
| 2 | 2. Pure Encapsulations — Magnesium Glycinate (Capsules)Best clean-label capsule | Best clean-label capsule | 8.7/10 | |
| 3 |  3. Thorne — Melaton-3 (3 mg, 60 capsules)Best melatonin | Best melatonin | 8.4/10 | |
| 4 |  4. Natrol — Fast Dissolve Melatonin 1 mg (90 tablets)Best low-dose melatonin | Best low-dose melatonin | 8/10 | |
| 5 |  5. Sports Research — Tart Cherry Fruit Complex (800 mg, 60 Softgels)Best food-derived option | Best food-derived option | 7.8/10 | |
| 6 |  6. Nutricost — Ashwagandha KSM-66 (600 mg, 120 Capsules)Best for wired-and-tired nights | Best for wired-and-tired nights | 7.6/10 |
Prices pulled from Amazon as of October 18, 2026 and are subject to change. The price shown on Amazon at checkout applies.
How we scored
Every product below is scored on six metrics, 0-10 each, with the weighting described on how we review. The criteria specific to this category:
- Trial evidence for sleep specifically. This is the heaviest-weighted metric and it is narrower than it sounds. Several supplements on this page are worth taking for other reasons and still score moderately here, because the only question that counts is whether controlled human trials show an effect on falling asleep, staying asleep, or sleep quality. We reward repeated randomized trials with a placebo arm and mark down anything resting on mechanism stories, animal work, or a single manufacturer-funded study.
- Dose and form that match the studies. A supplement works at the dose and in the chemical form that was actually tested. For magnesium that means elemental milligrams of a well-absorbed chelate, not the weight of the whole compound. For melatonin it means the low physiological doses the dose-response work used — 0.3 to 3 mg — not the 10 mg gummies the shelf is full of. For ashwagandha it means a standardized extract at the 300-600 mg twice-daily range the trials ran. We mark down products where the effective amount is undersized or buried in a blend.
- Label honesty and no proprietary blends. Sleep is the worst category in the supplement aisle for proprietary-blend fairy dust: eleven botanicals, one combined milligram figure, and no way to know how much of anything you are swallowing. We reward short, fully disclosed labels, single-ingredient products, and clear elemental-dose statements, and we mark down blends, added sugar, and 'calm complex' marketing language that implies clinical results the product never earned.
- Third-party testing, which matters unusually much here. Supplements are not pre-approved by the FDA, and melatonin specifically has a documented content problem: a 2017 analysis in the Journal of Clinical Sleep Medicine found melatonin content in commercial products varied widely from label claim, and a 2023 JAMA analysis of melatonin gummies found most were inaccurately labeled. NSF Certified for Sport, Informed Sport, and USP verification are the only practical defense, and they weigh heavily in this ranking.
- Value per night at the real dose. We calculate what an effective nightly dose costs, not what the smallest serving on the label costs. A 'cheap' bottle that needs three capsules to reach a studied amount is not cheap. This is why plain melatonin tablets score well on value and a premium magnesium powder still earns its place on total quality.
- Does it earn its place over fixing sleep hygiene? The final check is the honest one. If the same result is available from a consistent wake time, morning light, a cooler room, or moving your last coffee four hours earlier, we say so rather than selling you a bottle. Every product here is ranked as an add-on to those basics, never a replacement for them.
What to know before buying
- Match the product to your actual problem, because these are three different jobs. If you are physically restless, cramping, or generally short on magnesium, take magnesium glycinate in the evening. If your problem is timing — you cannot fall asleep until 2am, you have flown across five time zones, you are coming off nights — melatonin is the right tool at a low dose, taken early in the evening rather than at lights-out. If you are wired-and-tired, stressed, and lying there with a racing mind, ashwagandha is the one with trials pointed at that picture. Buying melatonin for restlessness or magnesium for jet lag is the most common waste of money in this category.
- Melatonin dose: less is more, and the shelf is wrong. The dose-response work published in the Journal of Clinical Endocrinology & Metabolism in 2001 tested 0.1, 0.3 and 3.0 mg in older adults with insomnia and found the low physiological dose restored sleep efficiency — higher was not better. Most retail melatonin is 5 or 10 mg, which is many times a physiological amount and more likely to leave you groggy the next morning. Start at 0.5-1 mg, take it two to three hours before your target bedtime if you are shifting your clock, and treat it as short-term. The AASM's 2017 clinical practice guideline recommends against melatonin for chronic insomnia in adults — if you have been taking it nightly for a year, that is a conversation with a doctor, not a restock.
- Read magnesium labels for elemental milligrams, not compound weight. A bottle shouting '500 mg magnesium glycinate' may deliver only 50-70 mg of actual magnesium. The NIH Office of Dietary Supplements puts the adult RDA at roughly 310-420 mg/day depending on age and sex, and most of that should come from food — leafy greens, nuts, seeds, legumes. A supplement is there to close a gap, so 100-200 mg elemental in the evening is a sensible add-on, not a mega-dose. Glycinate and citrate are both well absorbed; glycinate is gentler on the gut, which is why it dominates this page. Oxide is cheap, poorly absorbed, and mostly a laxative.
- Be realistic about tart cherry and glycine: real, mild, slow. The small trials on Montmorency tart cherry suggest a modest improvement in sleep quality and duration over one to two weeks, probably via anthocyanins plus a trace of naturally occurring melatonin. That is a nudge, not a knockout, and it is a reasonable one if you also want the exercise-recovery effect. Give any of these a consistent two-week run alongside unchanged sleep habits before you judge it, and if nothing changes, accept you are a non-responder and spend the money on blackout curtains.
- This is YMYL territory, and some sleep problems are medical. Nothing on this page treats a sleep disorder. Loud snoring with witnessed pauses in breathing, waking unrefreshed after a full night, falling asleep during the day, crawling sensations in your legs at night, or insomnia that has lasted months are all reasons to see a clinician — sleep apnea, restless legs syndrome and chronic insomnia have real treatments and a supplement is not one of them. Melatonin is also not a children's product to buy casually: the CDC reported a sharp rise in pediatric melatonin ingestions between 2012 and 2021. If you are pregnant, nursing, taking medication (especially sedatives, blood thinners, or blood-pressure drugs), or managing a health condition, clear any of this with your doctor first.
Our picks
Thorne — Magnesium Bisglycinate (Powder)
Key specs: ~200 mg elemental magnesium per scoop as magnesium bisglycinate · powder, so the dose is adjustable · single ingredient · manufactured in an NSF-certified facility · unflavored option with no sweetener
Pros
- Glycinate (bisglycinate) is the form most people tolerate nightly without the gut effects that make citrate and oxide unpleasant at useful doses
- A genuine ~200 mg elemental dose per scoop, stated as elemental magnesium rather than hiding behind compound weight
- Powder lets you titrate from a half dose upward, which is the sensible way to start any evening magnesium
- Single-ingredient, fully disclosed label from a brand with unusually rigorous testing standards for this industry
- Magnesium meta-analysis evidence for insomnia in older adults is the strongest sleep data any mineral on this page has
Cons
- Clearly the most expensive magnesium per serving here — you are paying for the testing standard and the format
- Unflavored magnesium powder tastes mineral-ish; most people need to mix it into something
- If you are already eating a magnesium-rich whole-food diet, the marginal benefit may be small to none
Who this one is for
For the reader whose problem is physical restlessness rather than timing: you are tired, you lie down, and your legs and jaw will not switch off. The powder format matters here — you can start at half a scoop and work up, which you cannot do with a fixed capsule. Skip it if your issue is purely a late body clock; that is melatonin's job, not magnesium's.
Thorne — Magnesium Bisglycinate (Powder)
- Sleep trial evidence8/10
- Dose & form10/10
- Label honesty10/10
- Third-party testing9/10
- Value per night6/10
Pure Encapsulations — Magnesium Glycinate (Capsules)
Key specs: 120 mg elemental magnesium per capsule as magnesium glycinate · vegetarian capsule · free of common allergens and unnecessary fillers · single active ingredient
Pros
- Fixed 120 mg elemental dose per capsule makes the nightly amount unambiguous — take one or two and you know exactly where you are
- Hypoallergenic formulation with minimal excipients, which matters for anyone who reacts to fillers
- Pure Encapsulations has a long track record of clean, verifiable labels in the practitioner channel
- Materially cheaper per serving than our top pick while using the same well-absorbed glycinate form
Cons
- No dose flexibility below 120 mg — capsules cannot be titrated the way a powder can
- Not carrying a sport-specific third-party certification mark, which matters if you compete in a tested sport
- Capsule count is modest for the price compared with the big-bottle value options
Who this one is for
For the person who wants the same glycinate case as our top pick but will not stand at the counter stirring powder into water every night. Also the right choice if you react to fillers and additives — this is about as short an ingredient list as a capsule gets.
Pure Encapsulations — Magnesium Glycinate (Capsules)
- Sleep trial evidence8/10
- Dose & form9/10
- Label honesty10/10
- Third-party testing7/10
- Value per night8/10
Thorne — Melaton-3 (3 mg, 60 capsules)
Key specs: 3 mg melatonin per capsule · single ingredient · NSF Certified for Sport · gluten-, dairy- and soy-free · 60 capsules
Pros
- NSF Certified for Sport is the strongest available answer to the documented melatonin content-variability problem — a 2017 JCSM analysis found commercial melatonin frequently missed its label claim
- 3 mg sits at the top of the studied range rather than the absurd 10 mg the retail shelf pushes, and a capsule is easy to take with or against food
- Single-ingredient capsule: no 'sleep blend' of valerian, GABA and chamomile at undisclosed doses
- Supported by the AASM circadian-rhythm guideline for delayed sleep-wake phase disorder and jet lag — a narrow but genuine indication
Cons
- 3 mg is still above the 0.3 mg physiological dose that performed best in the 2001 dose-response trial — many people do better opening the dose down, which a capsule makes awkward
- The AASM's 2017 guideline recommends against melatonin for chronic insomnia in adults, so this is a short-term or timing-specific tool, not a nightly habit
- Costs several times what a generic 1 mg tablet does for the same active ingredient
Who this one is for
For the timing problem specifically: jet lag, shift rotation, or a body clock stuck hours later than your alarm. It is also the melatonin to buy if you are a drug-tested athlete, because the content-accuracy problem in this category is real and NSF Certified for Sport is the only practical answer to it. Not the pick if you sleep at a normal time and simply feel restless.
Thorne — Melaton-3 (3 mg, 60 capsules)
- Sleep trial evidence7/10
- Dose & form7/10
- Label honesty10/10
- Third-party testing10/10
- Value per night7/10
Natrol — Fast Dissolve Melatonin 1 mg (90 tablets)
Key specs: 1 mg melatonin per fast-dissolve tablet · dissolves on the tongue, no water needed · 90 tablets · splittable for a sub-1 mg dose
Pros
- 1 mg is the lowest widely stocked dose, and the one most consistent with the evidence that low physiological doses work as well or better than high ones
- Fast-dissolve tablets can be halved, which is the only practical way to reach the ~0.5 mg range on a retail shelf
- By far the cheapest cost per night on this page — a 90-tablet supply for the price of a coffee round
- Nothing else in the formula: no proprietary calm blend, no melatonin-plus-CBD gimmick
Cons
- No sport-level third-party certification, which is a real gap given the documented label-accuracy problems in melatonin products
- Fast-dissolve tablets are sweetened and flavored to be palatable on the tongue
- Same guideline caveat as any melatonin: not recommended for chronic insomnia in adults, and not a product to give children casually
Who this one is for
For anyone who wants to try melatonin properly: low dose, short run, aimed at a timing problem. A 1 mg fast-dissolve tablet can be split, which gets you near the 0.3-0.5 mg range the dose-response research favored — something no 10 mg gummy can do. Skip it if you need third-party certification for competition.
Natrol — Fast Dissolve Melatonin 1 mg (90 tablets)
- Sleep trial evidence7/10
- Dose & form9/10
- Label honesty8/10
- Third-party testing4/10
- Value per night10/10
Sports Research — Tart Cherry Fruit Complex (800 mg, 60 Softgels)
Key specs: 800 mg tart cherry complex per softgel · made with Montmorency cherries · contains CherryPURE, the standardized concentrate used in the published recovery research · 60 softgels · gluten-free, non-GMO, no added sugar
Pros
- Names the Montmorency cultivar and the CherryPURE standardized concentrate — the specific material the trials actually used, not a vague 'cherry' blend
- The only pick here with a plausible second job: the small sleep trials sit alongside a larger body of exercise-recovery evidence
- No sugar, unlike the juice concentrate the research mostly used — a real advantage on a lower-carb diet
- 60-softgel bottle is a sensible two-month trial rather than a six-month commitment to something you may not respond to
Cons
- The sleep evidence is genuinely small and preliminary — a handful of short trials, modest effects, mostly self-reported
- Dried extracts are a step away from the juice concentrate the studies used, and no brand publishes an anthocyanin assay
- Slower than the other options here: give it a full two weeks before judging
Who this one is for
For the hard-training reader who wants a whole-food-style nudge rather than a hormone or a mineral, and who is already interested in tart cherry for soreness. Take it in the evening and you cover both jobs reasonably well. Not the pick if you want a decisive effect tonight — this one is mild and gradual by nature.
Sports Research — Tart Cherry Fruit Complex (800 mg, 60 Softgels)
- Sleep trial evidence5/10
- Dose & form8/10
- Label honesty9/10
- Third-party testing6/10
- Value per night8/10
Nutricost — Ashwagandha KSM-66 (600 mg, 120 Capsules)
Key specs: 600 mg KSM-66 ashwagandha root extract per capsule · standardized to 5% withanolides · 120 capsules · single ingredient · the extract and dose range used in the published sleep and stress trials
Pros
- KSM-66 is the specific standardized root extract the better ashwagandha trials ran on, at a dose inside the studied 300-600 mg range
- Targets the one sleep picture a mineral cannot touch: stress-driven, racing-mind sleep-onset trouble
- Lowest cost per capsule of any KSM-66 we track, which makes an honest 8-week trial affordable
- Single-ingredient label with the extract named on the front, not an 'adaptogen complex' hiding the dose
Cons
- Sleep is a secondary outcome in most ashwagandha research — the primary evidence is on stress and anxiety measures
- Not third-party certified for sport at this price point
- Real cautions apply: not for pregnancy, and it warrants medical advice if you take thyroid medication or have liver concerns
Who this one is for
For the reader whose sleep problem is stress-shaped: body tired, mind running the next day's list at midnight. KSM-66 at 600 mg is the standardized extract and dose used in the sleep and stress trials, which is why this is the only adaptogen on the page. Skip it if you are pregnant, on thyroid medication, or managing a liver condition without talking to your doctor.
Nutricost — Ashwagandha KSM-66 (600 mg, 120 Capsules)
- Sleep trial evidence6/10
- Dose & form9/10
- Label honesty9/10
- Third-party testing5/10
- Value per night9/10
Frequently asked questions
For most people, magnesium glycinate — our pick is Thorne Magnesium Bisglycinate. The reasoning is that it is the option with the best combination of real trial evidence, a dose you can control, and a plausible reason it would work for you: magnesium intake is genuinely short of the recommended amount for a lot of adults, glycinate is the form most people tolerate nightly, and the meta-analysis evidence on magnesium and insomnia in older adults is the strongest any mineral here has. If your problem is specifically timing rather than restlessness — jet lag, shift work, a body clock stuck hours late — the best supplement is low-dose melatonin instead, and 1 mg or less is the right starting point, not the 10 mg the shelf pushes. And if your nights are stress-shaped, with a tired body and a racing mind, KSM-66 ashwagandha is the one adaptogen with trials worth citing. There is no single best sleep supplement, because 'I cannot sleep' is three different problems with three different answers.
Related reading
- → When to take magnesium for sleep
- → How much tart cherry juice for sleep
- → Do weighted blankets work?
- → Magnesium glycinate benefits
- → Melatonin vs magnesium for sleep
- → Tart cherry vs melatonin
- → Magnesium glycinate vs citrate
- → Best magnesium for sleep
- → Best melatonin supplements
- → Best tart cherry supplement
- → Best ashwagandha supplements
- → Best supplements for muscle recovery
- → Best weighted blankets
Sources
- Magnesium — Health Professional Fact Sheet (RDA, food sources, supplement forms) — NIH Office of Dietary Supplements, 2022
- Oral Magnesium Supplementation for Insomnia in Older Adults: A Systematic Review & Meta-Analysis — BMC Complementary Medicine and Therapies, 2021
- Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults (recommends against melatonin for chronic insomnia) — Journal of Clinical Sleep Medicine (American Academy of Sleep Medicine), 2017
- Clinical Practice Guideline for the Treatment of Intrinsic Circadian Rhythm Sleep-Wake Disorders — Update for 2015 (supports melatonin for DSWPD) — Journal of Clinical Sleep Medicine (American Academy of Sleep Medicine), 2015
- Melatonin Treatment for Age-Related Insomnia (0.1, 0.3 and 3.0 mg dose-response) — The Journal of Clinical Endocrinology & Metabolism, 2001
- Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content — Journal of Clinical Sleep Medicine, 2017
- Quantity of Melatonin and CBD in Melatonin Gummies Sold in the US — JAMA, 2023
- Pediatric Melatonin Ingestions — United States, 2012-2021 — CDC Morbidity and Mortality Weekly Report, 2022
- The Effects of Sleep Extension on the Athletic Performance of Collegiate Basketball Players (110.9 minutes more sleep; sprint and shooting improvements) — Sleep, 2011
- Effects of tart cherry juice on sleep — small trials suggesting improved sleep quality/duration (anthocyanins and trace melatonin) — PubMed / U.S. National Library of Medicine
- Product titles, capsule counts, stated doses, live prices and availability for all six ranked products — retrieved via the Amazon product data layer — Amazon product listing data, 2026
Last verified: October 5, 2026. See our editorial policy and how we review for details on scoring and update cadence. Canonical URL: https://trustedhealthgear.com/reviews/best-supplements-for-sleep.
Thorne — Magnesium Bisglycinate (Powder)
$52.00 · on Amazon