Best Sleep Aids for Adults in 2026: What Works for Occasional Sleep Trouble

The pharmacy sleep aisle and the supplement section combined hold dozens of products marketed for adult sleep difficulty. Most of them work for some people in some situations. Almost none of them are appropriate as ongoing solutions for persistent insomnia, which has well-established treatments that work better than any over-the-counter option.

This guide covers five sleep aids appropriate for different occasional or specific sleep problems, framed honestly within what the published sleep medicine guidelines support. For occasional jet lag, a specific schedule disruption, a high-stress night before an important event, or general support during a period of mild sleep difficulty, the right product matched to the right situation can help. For chronic insomnia, defined as difficulty falling or staying asleep at least three nights per week for three months or longer, the American Academy of Sleep Medicine recommends cognitive behavioral therapy for insomnia (CBT-I) as the first-line treatment rather than any supplement or over-the-counter medication¹. The picks below are tools for occasional support, not substitutes for the medical care chronic insomnia deserves.

For the comparison between the two most popular supplement options, our guide to melatonin vs magnesium for sleep covers when each is appropriate. For the broader environmental factors that affect sleep more than any supplement, our guides to the best white noise machines, best blackout curtains for sleep, and best cooling pillows for hot sleepers address the conditions of sleep that no pill can fix.

Last updated: May 28 2026 | By Austin Murphy

This article is for general information only and is not medical advice. Both over-the-counter sleep medications and dietary supplements have real interactions with prescription medications and contraindications for specific medical conditions. Please consult a qualified healthcare provider before starting any sleep aid, especially if you take prescription medications, are pregnant or nursing, or have a diagnosed sleep disorder.

Quick Verdict

• Best for occasional stress-related difficulty winding down: magnesium glycinate has the most reasonable safety profile of any pick on this list for nightly use over multiple weeks.
• Skip OTC sleep aids for chronic insomnia: the AASM recommends cognitive behavioral therapy for insomnia (CBT-I) as first-line treatment; see a sleep medicine specialist if your sleep difficulty has persisted for three months or longer.

What the Sleep Medicine Bodies Say About OTC Sleep Aids

The American Academy of Sleep Medicine published its clinical practice guideline on the pharmacologic treatment of chronic insomnia in adults in 2017¹. The guideline reviewed individual medications including over-the-counter antihistamines (diphenhydramine, doxylamine), the supplement melatonin, and herbal options like valerian. Two findings from that guideline matter for how to read any “best sleep aids” article:

First, the guideline emphasizes that pharmacologic treatment for chronic insomnia should be considered mainly for patients who cannot participate in CBT-I, who still have symptoms despite that therapy, or who need a temporary adjunct to it. CBT-I is the AASM-recommended first-line treatment for chronic insomnia, not any pill or supplement. If your sleep difficulty has lasted longer than a few weeks, the first conversation worth having is with a sleep medicine professional about CBT-I, not the pharmacy aisle.

Second, the guideline issued specific recommendations against several common OTC options for chronic insomnia. The panel suggests clinicians not use diphenhydramine (the active ingredient in ZzzQuil and Benadryl-based sleep aids), not use doxylamine (the active ingredient in Unisom SleepTabs), and not use melatonin for sleep onset or sleep maintenance insomnia¹. These recommendations are weak rather than strong, reflecting the limited evidence base, but they signal that the major sleep medicine body does not endorse the products that dominate the pharmacy sleep aisle as treatments for chronic insomnia.

What this means in practice: the picks below are framed as tools for occasional or specific situations where they have at least a reasonable evidence base. None of them is presented as a chronic insomnia treatment, because the published clinical guidance does not support that use for any of them. If your sleep problem has persisted for three months or longer, the honest editorial answer is “see a sleep medicine specialist about CBT-I,” not “try the supplement aisle harder.”

How Different Sleep Aids Work

Melatonin

Melatonin is a hormone your pineal gland produces in response to darkness. It signals your circadian timing system that night has arrived. The published research supports its use for circadian rhythm disorders: jet lag, shift work disorder, delayed sleep-wake phase disorder. The AASM endorses timed melatonin for these specific circadian conditions². The same body recommends against melatonin for chronic insomnia. Common commercial doses (3 to 10 milligrams) exceed the doses tested in much circadian-shifting research, which used 0.3 to 0.5 milligrams.

Magnesium

Magnesium is an essential mineral involved in nerve and muscle function. The National Institutes of Health Office of Dietary Supplements describes its role in hundreds of enzymatic processes³. A small clinical research base supports its use for sleep, with the most cited trial (Abbasi 2012) using magnesium oxide at 500 milligrams in older adults with insomnia and reporting modest improvements after 8 weeks⁴. No AASM clinical practice guideline endorses magnesium for sleep.

OTC Antihistamines (Diphenhydramine and Doxylamine)

Diphenhydramine and doxylamine produce drowsiness by blocking histamine receptors. The resulting sedation can facilitate sleep onset but does not improve sleep architecture, and tolerance develops within several nights of regular use. Both have a long half-life that produces next-day grogginess for many users. The AASM 2017 guideline recommends against both for chronic insomnia¹. They remain appropriate for occasional acute use in specific situations.

Combination Supplements (Melatonin Plus Other Ingredients)

Many commercial sleep supplements combine low-dose melatonin with L-theanine, magnesium, vitamin B6, calcium, or herbal extracts like chamomile and valerian. The combination approach has weaker individual-ingredient research support but offers some users a more comprehensive option than single ingredients. Supplement quality varies significantly across the category, and products with third-party testing are more reliable than those without.

Best Sleep Aids for Adults in 2026

1. Thorne Magnesium Glycinate: Best for Most Occasional Sleep Difficulty

Best Overall for Occasional Sleep Difficulty | Price: ~$40

Thorne is the supplement brand most consistently recommended by physicians and integrative medicine practitioners for one specific reason: the company submits products to third-party testing through programs like NSF and publishes certificates of analysis. In a supplement industry where dose-label accuracy is genuinely variable, that quality assurance matters more than any specific ingredient choice.

Magnesium glycinate binds the mineral to glycine, an amino acid with research suggesting it may modestly support sleep on its own. The glycinate form has reasonable bioavailability and produces fewer gastrointestinal effects than magnesium oxide or citrate at therapeutic doses. The clinical evidence for magnesium glycinate specifically as a sleep aid is less robust than supplement marketing suggests. The strongest published sleep trial (Abbasi 2012) used magnesium oxide, not glycinate⁴. Practitioners and patients have found glycinate easier to tolerate, which is a meaningful real-world advantage even where the clinical evidence does not establish a clear sleep-specific superiority.

The conventional supplement range for magnesium for sleep is 200 to 400 milligrams of elemental magnesium taken 30 to 60 minutes before bed. The NIH upper limit for supplemental magnesium is 350 milligrams per day for adults³; doses above that are common in marketing but exceed the established safe range. People with kidney disease should not supplement magnesium without medical guidance. Magnesium also interacts with several prescription medications including certain antibiotics, blood pressure medications, and diuretics, so a pharmacist check before starting is worthwhile.

Key Features

• NSF third-party tested with published certificates of analysis
• Magnesium bisglycinate form (lower GI side effect profile)
• 120 capsules per bottle
• 200 milligrams elemental magnesium per serving
• Practitioner-favorite brand for supplement quality

PROS:

• Among the most reliable supplement brands for dose-label accuracy
• Reasonable safety profile for nightly use over several weeks at standard doses
• Lower GI side effect profile than oxide or citrate forms
• Practitioner-favorite brand widely recommended by clinicians

CONS:

• Higher price than bulk magnesium alternatives
• Clinical evidence for magnesium glycinate specifically for sleep is more limited than marketing suggests
• Effects build over 2 to 4 weeks rather than producing immediate one-night results
• Interacts with several prescription medication classes; pharmacist check warranted

Best for: Adults with occasional mild sleep difficulty who want a reasonable-quality supplement option, particularly when stress or muscle tension contributes to the difficulty winding down.

2. Natrol Melatonin 1mg Fast Dissolve: Best for Specific Timing Disruptions

Best for Jet Lag and Schedule Disruption | Price: ~$10

The most important specification on any melatonin product is the dose. The 1 milligram fast-dissolve format puts Natrol in the minority of commercial melatonin products at a dose closer to the lower end of what circadian-shifting research has tested. Most commercial melatonin products are dosed at 3 to 10 milligrams, which exceeds the dose tested in research on circadian timing effects and increases the likelihood of next-day grogginess without proportional benefit.

The honest framing on this product: it is appropriate for situations where the AASM endorses melatonin (jet lag from time zone travel⁵, shift work-related sleep difficulty, occasional Sunday-night schedule reset after an irregular weekend). It is not appropriate for chronic insomnia where the AASM recommends against melatonin¹. The 1 milligram dose taken 30 to 60 minutes before the target bedtime works well for these specific timing situations. The appropriate dose and timing for circadian phase shifting depend on individual chronotype and whether you are trying to advance or delay sleep, so a sleep medicine consult is worthwhile for anything beyond occasional travel use.

One quality concern that applies to all melatonin products including this one: a 2017 study published in the AASM’s Journal of Clinical Sleep Medicine tested 30 commercial melatonin supplements and found actual content ranged from 83 percent less to 478 percent more than label claim, with more than 71 percent of products failing to meet within a 10 percent margin of label⁶. About a quarter of products also contained unlabeled serotonin. The FDA does not regulate melatonin as a drug, so labeled doses cannot be assumed to match actual content. USP Verified or NSF certified products mitigate this; the Natrol fast-dissolve tablets do not currently carry these specific certifications.

Key Features

• 1 milligram dose closer to circadian-research range than typical commercial products
• Fast-dissolve tablet for sublingual absorption
• Affordable at approximately $10 for 90 tablets
• Widely available in pharmacies and online

PROS:

• Lower dose than typical commercial melatonin products
• Fast-dissolve format simpler than capsules for sublingual absorption
• Lowest price on this list
• Appropriate for situations the AASM endorses for melatonin use

CONS:

• Not USP Verified or NSF certified; supplement industry quality variability applies
• AASM recommends against melatonin for chronic insomnia; this product is for circadian situations only
• Effective dose and timing for circadian shifting are more nuanced than the package implies
• Nightly use beyond specific circadian situations is not supported by clinical guidance

Best for: Occasional use for jet lag, shift work-related sleep difficulty, or weekend-to-weeknight schedule resets where timing rather than sleep quality is the specific issue.

3. Olly Sleep Gummy: Best for Compliance-Challenged Users

Best Gummy Format Sleep Supplement | Price: ~$14

Olly is the practical answer to one specific problem: many adults who would benefit from a consistent nightly supplement habit cannot maintain it with capsules they keep forgetting to take. The gummy format removes the compliance barrier that prevents real-world use of more clinically reasonable options. A magnesium glycinate capsule that sits in the cabinet because the person dislikes swallowing it provides no benefit, regardless of how well-formulated the active ingredient is.

The Olly Sleep formulation combines 3 milligrams of melatonin with L-theanine and botanical extracts including chamomile and passionflower. The 3 milligram melatonin dose is higher than the lower end of the circadian-research range (0.3 to 0.5 milligrams) but lower than the 5 to 10 milligram doses most likely to produce next-day grogginess. L-theanine has modest research support for reducing physiological stress markers without sedation, which can support pre-sleep relaxation. The botanical extracts are at lower concentrations than dedicated single-ingredient products would deliver, and the clinical evidence for chamomile and passionflower as sleep aids is limited but not zero.

The honest assessment: this is a reasonable occasional-use product for adults who have tried capsule-format supplements and not maintained the habit. It is not a clinically optimized option, the melatonin dose is higher than minimal-effective for circadian shifting, and the same AASM caveats apply that apply to melatonin generally. For someone whose alternative is “no supplement at all because I forget to take capsules,” a gummy that gets used is more useful than a capsule that does not.

Key Features

• 3 milligrams melatonin per serving
• L-theanine plus botanical blend (chamomile, passionflower, lemon balm)
• Blackberry flavor; sugar content present
• 50 gummies per bottle
• Affordable at approximately $14

PROS:

• Gummy format substantially improves consistency for compliance-challenged users
• L-theanine has reasonable research for pre-sleep relaxation without sedation
• Pleasant flavor improves real-world consistency
• Widely available in pharmacies and grocery stores

CONS:

• 3 milligrams of melatonin is above the lower end of circadian-research range
• Sugar content in gummy format is a consideration for some users
• Botanical doses lower than dedicated single-ingredient supplements
• Same AASM caveats apply that apply to melatonin generally

Best for: Adults who have tried capsule-format supplements without maintaining consistent nightly use, where the gummy format is the deciding factor for whether the product gets used at all.

4. HUM Beauty zzZz: Best Multi-Pathway Supplement

Best Combination Sleep Supplement | Price: ~$25

HUM’s Beauty zzZz combines 3 milligrams of melatonin with vitamin B6 and calcium in a single tablet. The combination approach is more rational than it sounds: vitamin B6 is a cofactor in the body’s conversion of serotonin to melatonin, and calcium has limited but real research suggesting it may modestly support sleep quality. The formulation supports multiple physiological pathways rather than relying on a single mechanism, which fits the reality that sleep difficulty often has multiple contributing factors.

HUM products are Clean Label Project Certified, which provides some quality assurance though not the same level of clinical-grade certification as USP Verified products. The 3 milligram melatonin dose is the same as the Olly gummy and carries the same circadian-research caveat: higher than the lower end of effective dose range, lower than the doses most likely to cause grogginess. The combination supplement makes sense for adults whose sleep difficulty appears to have multiple contributing factors (stress, possible nutrient gaps, mild timing disruption) rather than a single isolated cause.

At around $25 for 30 tablets, the cost per use is moderate. Multi-ingredient supplements always carry one trade-off: when the product works, it is harder to identify which ingredient is producing the benefit. For adults who want to try a comprehensive approach before isolating to single ingredients, that trade-off may be acceptable.

Key Features

• 3 milligrams melatonin
• Vitamin B6 (cofactor in melatonin synthesis pathway)
• Calcium (limited research support for sleep quality)
• Clean Label Project Certified
• 30 vegan tablets per bottle

PROS:

• Multi-pathway formulation supports several aspects of sleep physiology
• Clean Label Project Certified for some quality assurance
• Vitamin B6 inclusion is biochemically reasonable
• Vegan formulation accommodates dietary restrictions

CONS:

• Combination supplements make it harder to identify which ingredient helps
• 3 milligrams of melatonin above the lower end of circadian-research range
• Not USP Verified or NSF certified
• More expensive than individual ingredients purchased separately

Best for: Adults whose occasional sleep difficulty appears to involve multiple contributing factors who want to try a combination approach before isolating to single ingredients.

5. Unisom SleepTabs: Best Occasional-Use Only Option

Occasional-Use Only Sedative | Price: ~$10

Unisom SleepTabs contain doxylamine succinate, an antihistamine that produces sedation by blocking histamine receptors. The product is included here because it dominates pharmacy shelf space and many adults will encounter it as their first sleep aid; pretending it does not exist would not help readers make informed choices. The honest framing has two parts.

First, the AASM 2017 clinical practice guideline recommends against doxylamine for chronic insomnia¹. The recommendation is weak rather than strong, reflecting limited evidence, but the signal from the major sleep medicine body is clear: this is not a chronic insomnia treatment. Tolerance to the sedating effect develops within several nights of regular use, so the product loses effectiveness with repeated nightly use even setting aside the guideline.

Second, doxylamine has a real role for specific acute occasional use: a single high-stress night before an important event when getting some sleep matters, a few nights of travel disruption, or interrupting an acute sleep difficulty period before it becomes a pattern. Used occasionally rather than regularly, with awareness of the 9-hour half-life that produces morning grogginess, and not combined with alcohol or other sedating substances, doxylamine provides reliable acute sedation. Anticholinergic effects (dry mouth, constipation, urinary retention) and cognitive effects in older adults are real concerns that warrant attention; people over 65 should generally avoid this category, and the American Geriatrics Society Beers Criteria flag both diphenhydramine and doxylamine as potentially inappropriate for older adults.

Key Features

• Doxylamine succinate 25 milligrams per tablet
• 32 tablets per package
• Sedating antihistamine mechanism
• Widely available without prescription

PROS:

• Reliable acute sedation for occasional specific situations
• Most affordable option on this list
• Widely available without prescription
• Useful for interrupting a short acute sleep difficulty period

CONS:

• AASM recommends against doxylamine for chronic insomnia
• Tolerance develops within several nights of regular use
• 9-hour half-life produces morning grogginess for many users
• Anticholinergic effects warrant caution; potentially inappropriate for adults over 65
• Does not improve sleep architecture (sedation rather than restorative sleep)

Best for: Occasional acute use only, when getting some sleep for a specific event matters more than sleep quality. Not appropriate as ongoing sleep management.

Which Sleep Aid Fits Your Situation

Prices and product availability shift with sales and seasonal promotions. The recommendations above reflect typical situations and are not individual medical advice.

The Better-Than-Supplements First Step

The honest editorial answer most “best sleep aids” articles avoid is that for adults with persistent sleep difficulty, the highest-impact first step is rarely a supplement. Sleep hygiene practices (consistent sleep schedule, reduced screen time before bed, cooler bedroom temperature, light morning sunlight exposure) produce more reliable improvement than most over-the-counter options for adults who have not already established them. For sleep difficulty that has persisted despite consistent sleep hygiene, CBT-I has the strongest clinical evidence of any intervention and is the AASM-recommended first-line treatment¹.

CBT-I is delivered by sleep psychologists or trained therapists, typically over 4 to 8 sessions. Several online and app-based CBT-I programs exist that are accessible at lower cost than in-person therapy. The clinical evidence for CBT-I is consistently stronger than the clinical evidence for any over-the-counter sleep aid for chronic insomnia. If your sleep difficulty has lasted longer than a few weeks, the first conversation worth having is with a healthcare provider about whether CBT-I is appropriate, not the pharmacy aisle.

When to See a Doctor

The following situations call for professional evaluation rather than self-medication with any sleep aid:

• Sleep difficulty has persisted three or more nights per week for three months or longer. This meets the clinical definition of chronic insomnia disorder and warrants evaluation by a sleep medicine professional. The AASM recommends CBT-I as first-line treatment¹.
• Symptoms suggesting sleep apnea: loud snoring, witnessed pauses in breathing during sleep, gasping awakenings, persistent daytime sleepiness despite adequate sleep time, morning headaches. These warrant a sleep study, not a supplement.
• Symptoms suggesting restless leg syndrome or periodic limb movement disorder: uncomfortable sensations in the legs that worsen at rest and improve with movement, especially in the evening.
• Sleep difficulty accompanied by significant mood changes, including depression, anxiety that affects daily function, or thoughts of self-harm. Sleep difficulty and mood disorders frequently co-occur and both warrant professional care.
• Excessive daytime sleepiness that affects driving safety or work performance regardless of how much sleep you get at night.
• If you take prescription medications, both supplement and OTC sleep aid options can interact with your other medications. A pharmacist or physician should review your full medication list before you add anything.
• Pregnancy, breastfeeding, kidney disease, liver disease, heart conduction problems, and several other conditions are contraindications or relative contraindications for one or more of the products discussed here.

None of the products in this guide substitutes for medical evaluation when the underlying sleep problem is something other than what self-management can address.

Our Take

The pharmacy sleep aisle implies more confidence in over-the-counter sleep aids than the published clinical guidance supports. The American Academy of Sleep Medicine’s 2017 clinical practice guideline recommends against melatonin, diphenhydramine, and doxylamine for chronic insomnia, and recommends CBT-I as first-line treatment¹. For occasional or specific sleep situations (jet lag, an acute high-stress night, occasional stress-related wind-down difficulty), some of these products have a reasonable role. If you have chronic insomnia, none of them is the right answer.

And for most adults whose sleep difficulty fits the occasional category and who want a reasonable-quality supplement to try, the Thorne magnesium glycinate at $40 is the most defensible starting point. Also, for any specific jet lag or time zone travel, the Natrol melatonin 1mg at $10 is the targeted option the AASM endorses for those situations. If you are a compliance-challenged user, the Olly gummy at $14 is the format that gets used. Or for a multi-pathway combination, the HUM Beauty zzZz at $25 covers more physiological territory. For genuine occasional acute use, the Unisom SleepTabs at $10 provides reliable sedation, but only for the occasional case the product was designed to address.

For chronic insomnia, none of these is the right product. See a sleep medicine professional about CBT-I.

Frequently Asked Questions

What is the best sleep aid for adults in 2026?

For occasional mild sleep difficulty, magnesium glycinate from a quality-tested brand like Thorne is the most defensible starting point. When it comes to specific timing situations like jet lag or shift work, the AASM endorses low-dose melatonin. With chronic insomnia (sleep difficulty three or more nights per week for three months or longer), the AASM recommends cognitive behavioral therapy for insomnia (CBT-I) as first-line treatment, not any supplement or OTC sleep aid.

Are OTC sleep aids safe to use every night?

OTC antihistamine sleep aids like Unisom (doxylamine) and ZzzQuil (diphenhydramine) are not appropriate for regular nightly use. Tolerance develops within several nights, the AASM recommends against both for chronic insomnia, and anticholinergic effects raise particular concern for adults over 65. Supplement-based options like magnesium glycinate and low-dose melatonin have more reasonable safety profiles for extended nightly use, though even these warrant a healthcare provider check before establishing as a routine.

How long does it take for sleep aids to work?

It varies by product type. Antihistamine sedatives like doxylamine produce drowsiness within 30 to 60 minutes. Low-dose melatonin works on the timeframe of circadian shifting, which is typically one to two weeks of consistent appropriately-timed dosing to produce meaningful clock position change. Magnesium typically requires 2 to 4 weeks of consistent nightly use to produce noticeable effects on sleep quality based on the Abbasi trial⁴. If you are testing whether a non-sedating supplement helps, give it several weeks before drawing conclusions.

Is melatonin safe to take every night?

The AASM recommends against melatonin for chronic insomnia¹, and supplement quality varies significantly (a 2017 study found melatonin content ranging from 83 percent less to 478 percent more than label claim across 30 products⁶). For occasional use in situations the AASM endorses (jet lag, shift work), short-term use is generally considered low-risk for most adults. For nightly use over months or years, talk to a healthcare provider about whether melatonin is appropriate and about USP Verified or NSF certified products.

What is CBT-I, and why does the AASM recommend it for chronic insomnia?

Cognitive behavioral therapy for insomnia (CBT-I) is a structured therapy program that addresses the thoughts, behaviors, and habits that maintain chronic insomnia. It typically involves 4 to 8 sessions with a sleep psychologist or trained therapist and addresses sleep restriction, stimulus control, cognitive restructuring around sleep anxiety, and sleep hygiene. The AASM recommends CBT-I as first-line treatment for chronic insomnia because the clinical evidence for it is stronger than the evidence for any pharmacologic option¹. Several online and app-based CBT-I programs make it more accessible than in-person therapy.

Can I combine multiple sleep aids?

Combining sleep aids increases the risk of unintended effects and makes it harder to identify which product is helping or causing problems. Also, if you combine sedating antihistamines with melatonin, magnesium, or other supplements, it increases the risk of excessive sedation. And if you are combining any sleep aid with alcohol, prescription sedatives, or other CNS depressants, it is potentially dangerous. Talk to a pharmacist or physician before combining any sleep aids or combining a sleep aid with prescription medications.

When should I see a doctor about sleep problems instead of trying OTC options?

See a healthcare provider if your sleep difficulty has persisted three or more nights per week for three months or longer, if you have witnessed breathing pauses or gasping during sleep, if you have excessive daytime sleepiness affecting safety, if your sleep difficulty is accompanied by significant mood changes, or if you have any new neurological or systemic symptoms alongside sleep difficulty. These patterns warrant professional diagnosis and evidence-based treatment rather than OTC supplement management.

What sleep aids are safe for adults over 65?

Adults over 65 should generally avoid sedating antihistamines (diphenhydramine and doxylamine) due to the American Geriatrics Society Beers Criteria, which flag both as potentially inappropriate medications due to anticholinergic effects, cognitive concerns, and fall risk. Lower-dose melatonin and magnesium have more favorable safety profiles for older adults but still warrant a healthcare provider check, particularly given the higher likelihood of prescription medication interactions in this age group. Pharmacist consultation before starting any sleep aid is especially important for adults over 65.

Sources

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3. National Institutes of Health, Office of Dietary Supplements. Magnesium: Fact Sheet for Health Professionals. Updated 2022. View source
4. Abbasi B, Kimiagar M, Sadeghniiat K, Shirazi MM, Hedayati M, Rashidkhani B. The effect of magnesium supplementation on primary insomnia in elderly: A double-blind placebo-controlled clinical trial. J Res Med Sci. 2012;17(12):1161-1169. View source
5. Morgenthaler TI, Lee-Chiong T, Alessi C, et al. Practice Parameters for the Clinical Evaluation and Treatment of Circadian Rhythm Sleep Disorders. Sleep. 2007;30(11):1445-1459. View source
6. Erland LAE, Saxena PK. Melatonin Natural Health Products and Supplements: Presence of Serotonin and Significant Variability of Melatonin Content. J Clin Sleep Med. 2017;13(2):275-281. View source