Fall asleep faster · Stay asleep all night · Wake up refreshed · 60-day money-back guarantee
Six bottles of Yu Sleep liquid sleep supplement from the official website

Yu Sleep Supplement Official Site: A Low-Dose Sleep Formula, Built on a Transparent Label

Yu Sleep is a liquid sleep supplement built so you can fall asleep on a gentle, natural signal and wake up clear. Each 2 mL serving gives you 0.9 mg of melatonin, about a tenth of a typical gummy, plus magnesium glycinate, GABA, L-theanine, 5-HTP, apigenin, lemon balm, red tart cherry and vitamins B6 and B2. It is designed to help you:

  • Fall asleep faster, without a high dose of melatonin
  • Stay asleep all night, with fewer 3 AM wake-ups
  • Wake up refreshed, not groggy

You hold two droppers under your tongue about 30 minutes before bed. It is sold only on the official website for $49 to $69 per bottle, and every order is protected by a 60-day money-back guarantee. This guide is published by Yu Sleep Supplements, an independent site that is not the manufacturer.

0.9 mgMelatonin per serving
10Labeled ingredients
60Day money-back guarantee
Buy Now: See Full Formula & PricingOfficial website · ships within a day
  1. First nightsCalmer wind-down; many people fall asleep faster and wake clearer.
  2. Week 6Fewer 3 AM wake-ups as the slower ingredients build up.
  3. Month 2A settled routine; this is when to judge whether it works for you.
  4. Months 3–6The manufacturer's suggested course for the fullest effect.

Yu Sleep supports your brain's sleep-pressure system, so you fall asleep naturally, sleep deeper and wake up rested

Instead of leaning on a high dose of melatonin or a synthetic sedative that leaves you foggy, the formula uses plant-based and amino-acid ingredients to work with your body's own rhythm. Here is what the manufacturer says you can expect, and what the ingredient research supports.

Woman sleeping deeply with a bottle of Yu Sleep on the bedside table

Deeper, more restorative sleep in the first days

You take two droppers about 30 minutes before bed. The fast-acting ingredients, GABA, L-theanine and the low melatonin dose, are the ones you feel first. Most users describe a calmer mind at lights-out, fewer wake-ups and a clearer morning within the first few nights. The manufacturer's own survey says the same; independent reviewers often describe the first nights as subtle, with the bigger change arriving later.

By week 6: the slower ingredients catch up

  • Sleeping through the night more easily
  • Better recovery scores on Oura, WHOOP or Garmin for users who track
  • Sharper focus and steadier mood during the day
  • Fewer stress cravings and afternoon energy crashes

Months 3 to 6: a full sleep-system reset

The manufacturer frames three to six months of nightly use as the course that lets your natural sleep architecture settle. The slowest part of the formula, 5-HTP with vitamin B6 feeding your own serotonin and melatonin production, is the reason results are described as building rather than instant. We have not seen a clinical trial on the finished product, so treat the timeline as the brand's reported experience, not a guarantee.

What it is

What is Yu Sleep?

Yu Sleep is a dietary supplement designed to help you fall asleep faster, stay asleep through the night and wake up without the heavy, groggy feeling that high-dose melatonin often leaves behind. It is a sleep aid for adults who are tired of choosing between "nothing works" and "I feel drugged in the morning."

Most sleep aids are pills or gummies. Yu Sleep is a sublingual liquid. You hold the drops under your tongue for a moment before swallowing. The manufacturer says this lets the ingredients absorb faster than a capsule that has to break down in your stomach. For you, that means a product you can take 30 minutes before bed rather than an hour or more ahead, and a dose you can fine-tune drop by drop.

The formula rests on a simple idea: sleep problems rarely have one cause. Some nights you cannot switch off a racing mind. Other nights you drift off fine but wake at 3 AM. Some mornings you feel wrecked after seven hours in bed. Yu Sleep uses ten ingredients that each work on a different link in that chain, from the stress response and muscle tension to your body clock and serotonin production. You get one bottle instead of four separate supplements.

The product is made in the United States and sold directly to you through its official website. You will not find it in pharmacies, Walmart, GNC or on Amazon, and that matters when you go to buy (we explain how to buy Yu Sleep safely below). The sales page names a Dr. Andrew Collins as the formulator; we could not verify any credentials for that name, and we cover Yu Sleep Dr. Collins in a separate report.

Likely a good fit if you

  • Lie awake for a long time because of stress or overthinking, and want a calmer mind at lights-out
  • Wake in the middle of the night and struggle to get back to sleep
  • Have tried melatonin and felt groggy, foggy or hungover the next morning
  • Want a non-habit-forming option before you consider prescription sleep medicine

Talk to a doctor first if you

  • Are under 18, pregnant or breastfeeding
  • Take SSRIs, MAOIs, other antidepressants, sedatives, blood-pressure or thyroid medication (5-HTP and GABA can interact)
  • Have diagnosed sleep apnea, narcolepsy or another sleep disorder that needs medical treatment

Meet a few Yu Sleep customers and the results they report

The six stories below are published on the official Yu Sleep order page as verified purchases. We quote them so you can see what the brand highlights, and we add what we found from independent sources right after.

Testimonials are reproduced from the official Yu Sleep sales page, which states that they were forwarded by customers and may not reflect the typical purchaser's experience. We could not independently verify them. Individual results vary.

Evidence

Does Yu Sleep work? What the evidence and users say

There is no clinical trial of Yu Sleep itself. What you have is research on each ingredient, most of it positive but modest in size, plus a large volume of customer feedback. We read published reviews and public complaint records, and three patterns stood out.

The official offer page shows a counter of more than 36,000 reviews and a 4.9-star average, while the brand's own shop page showed 353 reviews when we checked. We could not independently verify either number, so we treat them as marketing, not evidence. The Better Business Bureau lists the business in Aurora, Colorado: not accredited, rated C+, with six complaints closed in the past three years as of October 5, 2026. We audit that profile in Yu Sleep BBB, Trustpilot and Reddit. For a balanced read of praise and criticism, see our Yu Sleep reviews page. Individual results vary.

Pros

  • You wake up clearer: 0.9 mg melatonin is a fraction of a typical gummy dose
  • You cover onset, night waking and stress with one product instead of four
  • You can dose down drop by drop because it is a liquid
  • You can stop any time: non-habit forming, no known withdrawal
  • You can test it for two full months with a 60-day money-back guarantee
  • Made in a GMP-certified US facility (per manufacturer)

Cons

  • The proprietary blend hides individual doses
  • No clinical trial on the finished formula
  • Premium price; sold online only
  • 5-HTP means it is not suitable with antidepressants
  • Shipping is only free on the 6-bottle package
  • Many look-alike websites make it easy to buy from the wrong seller

Inside each serving you get the synergy of these 10 deep-sleep ingredients

Three ingredients are listed with exact amounts; the other seven sit in a 637 mg proprietary blend. Here is what each one is in the bottle to do for you.

Yu Sleep ingredients: every ingredient in your nightly dose

You get ten active ingredients in every 2 mL serving. Three are listed with exact amounts: vitamin B2, vitamin B6 and melatonin. The other seven are grouped into a 637 mg proprietary blend. That is a real limitation, and we want you to know it before you buy: you can see the total blend weight, but not how much magnesium or L-theanine you get per serving. Here is the supplement facts panel as published by the manufacturer in its 2026 label update.

Yu Sleep supplement facts label: serving size 2 mL, vitamin B2 0.5 mg, vitamin B6 0.5 mg, melatonin 0.9 mg, proprietary blend 637 mg
The Yu Sleep supplement facts panel as printed on the bottle (2026 label).

Formula note: the 637 mg proprietary blend combines red tart cherry concentrate, magnesium glycinate, apigenin, lemon balm, 5-HTP, L-theanine and GABA. Individual amounts inside the blend are not disclosed, which is common in the supplement industry but worth knowing. Always ask your doctor if you take other medications.

Yu Sleep supplement facts (per 2 mL serving)
IngredientAmountWhat it does for you
Vitamin B2 (riboflavin)0.5 mgSupports energy metabolism and normal nervous-system function
Vitamin B6 (pyridoxine)0.5 mgHelps your body turn 5-HTP into serotonin and then melatonin
Melatonin0.9 mgTells your brain it is night and supports your body clock, at a dose low enough to wake up clear
Proprietary blend637 mgRed tart cherry juice concentrate, magnesium glycinate, apigenin, lemon balm extract, 5-HTP (Griffonia seed), L-theanine, GABA

Want the studied doses, the evidence grade and the interactions for each one? Read our full Yu Sleep supplement facts guide, which also walks through the Yu Sleep ingredients list line by line.

Yu Sleep helps reduce, even stop, those brutal 3 AM wake-ups

Older couple sleeping peacefully through the night

A 3 AM wake-up usually has two triggers: a cortisol spike that nudges you awake, and a mind that starts running the moment you surface. Yu Sleep is built to work on both. Magnesium glycinate and lemon balm support a relaxed body and steadier cortisol through the night, while GABA, L-theanine and apigenin give your brain the quiet signal it needs to stay asleep instead of lying there staring at the ceiling.

Turning down the mental chatter is what lets your tired body actually rest. If night waking is your main problem, this is the part of the formula to pay attention to, and it is the benefit reviewers mention most after "no grogginess." We cover every cause, from cortisol to blood sugar, in our guide to waking up at 3am.

The mechanism

How Yu Sleep works for you

The manufacturer calls Yu Sleep a "multi-pathway" formula. In plain terms, the ingredients fall into four groups, and each group targets one common reason you sleep badly.

  1. You quiet a racing mind

    GABA, L-theanine, apigenin and lemon balm all act on your brain's inhibitory systems. This is the "can't switch off" problem: you are tired, but your thoughts keep running. These ingredients are designed to turn down that mental noise without knocking you out.

  2. You reset your sleep clock

    Melatonin and tart cherry tell your brain that night has started. Because the melatonin dose is low, the goal is to nudge your body clock rather than flood it. That is why the manufacturer recommends taking it at the same time each night: you train a rhythm instead of forcing one.

  3. You support your own serotonin

    5-HTP with vitamin B6 feeds the pathway that produces both serotonin (mood, relaxation) and melatonin. This is the slowest part of the formula, and it is why results are described as building over weeks rather than on the first night.

  4. You relax your body

    Magnesium glycinate supports muscle relaxation and helps regulate cortisol, the stress hormone behind many 3 AM wake-ups. Less physical tension at bedtime means fewer reasons to surface at night.

Illustration comparing a racing mind before Yu Sleep with calm brain waves after taking it
The formula targets the overactive-mind side of insomnia that melatonin alone does not address.

Because the liquid absorbs partly through the tissue under your tongue, the company says you can feel the calming effect in about 30 to 45 minutes. That is plausible for L-theanine and GABA, which act quickly. It has not been tested in a published trial on the finished product, so treat the timing as a reasonable expectation, not a proven number.

What the formula targets

Six areas of sleep Yu Sleep supports

Comparison

Yu Sleep vs regular melatonin

The question we hear most: is Yu Sleep any better than a $10 bottle of melatonin? The honest answer is that they are different tools, and you should pick the one that fits your problem.

Yu SleepTypical melatonin gummy
Melatonin per serving0.9 mg, so you wake up clear5–10 mg
Other actives9 (GABA, L-theanine, magnesium, 5-HTP, etc.)Usually none
Best forStress-driven insomnia, night waking, grogginess from melatoninJet lag, an occasional shifted bedtime
Morning grogginessRarely reportedCommon at 5 mg and above
FormSublingual liquid you can fine-tuneGummy or tablet, fixed dose
Cost per nightAbout $1.60–$2.30About $0.15–$0.40

If your only issue is an occasional late night, plain melatonin is cheaper and fine. If melatonin has made you groggy or stopped working, the multi-ingredient approach is what Yu Sleep offers you. We go deeper in low dose melatonin vs high dose, including the research on Yu Sleep alternatives, and we compare dose accuracy and sugar in Yu Sleep vs Olly sleep.

Directions

How to take Yu Sleep

You get the most from the formula with a simple routine. Five steps:

  1. Shake the bottle well

    The botanicals can settle, so a few seconds of shaking gives you a consistent dose.

  2. Take two droppers under the tongue

    Fill the dropper twice (2 mL total) and hold the liquid under your tongue for 30 to 60 seconds before swallowing. This is where the faster absorption happens.

  3. Time it 30 minutes before bed

    Take it at the same time every night, so your body clock learns the cue.

  4. Dim the lights

    Melatonin works against bright light, not with it, so keep screens off during that 30-minute window.

  5. Give it three to four weeks

    The serotonin-pathway ingredients build slowly, so judge results after a month, not a night.

How to use Yu Sleep drops: shake well, take 2 droppers, 30 to 45 minutes before bed
Yu Sleep directions: shake, two droppers, 30–45 minutes before bed.

Many users start with a single dropper for the first few nights to check tolerance, then move to the full serving. Do not exceed two droppers per night. Full timing tips, what to do if you miss a dose and the full Yu Sleep directions are in our guide on how to take Yu Sleep.

Safety

Yu Sleep side effects and safety

You are taking ingredients that are each sold on their own as supplements and have long safety records at normal doses. Reported side effects are mild and usually show up in the first week: vivid dreams (melatonin), mild stomach upset or loose stools (magnesium), and an occasional headache or daytime drowsiness if two droppers is too much for you. Dropping to one dropper usually resolves these, which is one practical advantage of a liquid.

The real safety issue is interactions. 5-HTP raises serotonin, so combining it with SSRIs, SNRIs, MAOIs, tramadol or triptans can in rare cases cause serotonin syndrome. GABA and lemon balm add to the effect of sedatives and alcohol. Melatonin can affect blood-pressure and blood-sugar medications. If you take any prescription medicine, ask your doctor or pharmacist before your first dose. Our guide to Yu Sleep side effects lists every known Yu Sleep safety group and who should not take it.

Three bonuses included free with the 3- and 6-month packages

The official checkout adds three digital downloads to the two larger bundles. They are not sold separately, so here is what you actually get.

The Wind Down Routine bundle: ebook, tablet and headphones
Bonus 1

The Wind Down Routine bundle

Eleven bedtime stories in both ebook and audio form, written to slow a racing mind the way being read to did when you were a child. Take your two droppers, press play and let the narration carry you off. The official page values it at $97; it has no separate price, so treat that number as a marketing figure.

Younger and Happier While You Sleep ebook cover
Bonus 2

"Younger and Happier While You Sleep" ebook

A short guide to nightly rituals that help you release the day's stress and set a positive emotional cue before bed. The idea is simple: a calmer pre-sleep mindset means lighter sleep onset and a better mood in the morning. Useful habits, modest in scope.

Popular Bedtime Snacks That Trigger 3 AM Wakeups guide cover
Bonus 3

Bedtime snacks that trigger 3 AM wake-ups

A guide to the "healthy" evening snacks and drinks that spike blood sugar or blunt melatonin overnight, plus a simple blueprint for what to eat instead so your blood sugar stays steady until morning. Of the three, this is the one most likely to change a habit that is quietly undoing your sleep.

What happens in the second month of Yu Sleep, and why packages start at two months

Physical therapist guiding an older woman through an exercise, an analogy for finishing a course of Yu Sleep

The brand uses a physical-therapy analogy, and it is a fair one. After an injury you feel better within days of starting treatment, but stop before the tissue fully heals and you slide back. The manufacturer says your sleep-pressure system works the same way: the first week brings relief, the deeper repair of your sleep architecture takes three to six months of consistent use, and stopping at one month means you felt the improvement without locking it in.

That is the stated reason the official site sells Yu Sleep only in 2-, 3- and 6-month packages, with no single bottle. It is also, plainly, good for the seller. Our advice: the 2-bottle package already covers the full 60-day guarantee window, so you can run a real test with your money protected. The 6-bottle package is the right call only once you know it works for you. The brand also claims that most people keep sleeping well after finishing a course; we found no study that tests that, so treat it as a hope, not a promise.

Pricing

Yu Sleep price and packages: three supply sizes, one formula

You pay by bundle, and the per-bottle cost drops the more you buy. These are the prices on the official checkout page at our last check on October 14, 2026, against a $99 list price per bottle. Prices change during promotions, so confirm at checkout.

2-month supply

30% off · save $60

$99$69/bottle

2 bottles · $138 total · + shipping

  • 60 servings
  • 60-day money-back guarantee
  • A two-month trial at the highest per-bottle rate
Buy Now: Select 2 bottles
Most popular

3-month supply

40% off · save $120

$99$59/bottle

3 bottles · $177 total

  • 90 servings: covers the 3–4 week test with a bottle to spare
  • 3 digital bonuses included
  • 60-day money-back guarantee
Buy Now: Select 3 bottles
Best value

6-month supply

50% off · save $300

$99$49/bottle

6 bottles · $294 total · free US shipping

  • Lowest price per night, about $1.63
  • Free US shipping + 3 digital bonuses
  • 60-day money-back guarantee
Buy Now: Select 6 bottles
Accepted cards: Mastercard, Visa, American Express, DiscoverSecure checkout processed by BuyGoods · orders ship within 24 hours in discreet packaging

Which bundle fits you? If you want to run the full three-to-four-week test the manufacturer recommends, the 3-bottle package covers it with a bottle to spare at $59 each. If you already know you will use it nightly, the 6-bottle package brings the price down to $49 per bottle and adds free US shipping. The 3- and 6-bottle bundles both include the three digital bonuses described above.

Some ad landing pages for the same product advertise a 6-bottle price of $39 per bottle ($234, "save $360"). When we clicked through to the checkout on October 14, 2026, the cart showed $49 per bottle ($294), so the lower figure appears to be a promotion that is not always live. The three-tier structure above is what the official site has run for most of 2026. Payment is processed by BuyGoods, a US-based retailer that handles billing and refunds for the product, so your statement will show "BuyGoods" rather than "Yu Sleep." Full details on the guarantee and how to claim it are in our Yu Sleep returns and Yu Sleep price guide.

Guarantee

Yu Sleep refund policy: a 60-day window to actually judge it

60 days money back guarantee seal

You can try Yu Sleep for two full months with your money protected. Every order carries a 60-day money-back guarantee. If you are not satisfied, you contact support within 60 days of purchase, receive a return authorization, and ship back the bottles (used or empty is fine). Your refund goes back to your original payment method.

Two details are easy to miss, and knowing them protects you. First, return shipping is your cost. Second, some seller pages state that original shipping and handling is deducted and that only one refund is allowed per customer, while others say "no questions asked." Read the refund policy on the exact page you buy from and keep your order-number email. That one email makes a Yu Sleep return policy request fast if you ever need it.

Yu Sleep 60-day money-back guarantee seal with GMP certified, FDA registered facility, natural ingredients, made in the USA and GMO-free badges
The guarantee and quality badges shown on the official Yu Sleep website. GMP, FDA-registered facility, natural and non-GMO are the manufacturer's claims; the 60-day refund is the term we verified on the order page.

Where to buy

Yu Sleep official website: where to buy and how to avoid fakes

The Yu Sleep official site is the only place the brand sells its drops, and this page is our independent guide to it: what you get, what it costs and how to tell the real checkout from the copies that borrow its name. Everything below reflects what the Yu Sleep official website states, checked against the label and the retailer that processes its orders.

You get the guarantee, the bundle pricing and the real product in one place: the official website. Yu Sleep is not on Amazon, eBay, Walmart or in stores, and the manufacturer says any listing on those marketplaces is either a reseller or a counterfeit. Popularity has created a second problem: dozens of look-alike domains with small spelling changes (extra letters, swapped vowels, ".site" or ".us" endings). Many are affiliate pages that link back to the real checkout, but some are not.

Checklist before you buy

  • The checkout page should be processed by BuyGoods (you will see the BuyGoods name and order form).
  • The price structure should match $69 / $59 / $49 per bottle. A much lower price is a red flag.
  • The 60-day guarantee should be stated on the order page, not just in an ad.
  • Avoid marketplace listings; the guarantee does not cover them.

If you are in the UK, Canada or Australia, you can order from the same official checkout; our guide on where to buy Yu Sleep covers shipping times of 15 to 21 business days, customs and what we found when checking marketplace listings. If you have run into a suspicious seller, our report on Yu Sleep scam and fake-site warnings will help you sort real problems from imitation sites.

Start Yu Sleep tonight. Judge it over 60 days.

Order from the official website and you get the 60-day money-back guarantee, the current bundle pricing and the three digital bonuses on 3- and 6-bottle packages.

Buy Now: See Pricing & Order on the Official Website

Our take

Our verdict

4.2/5

★★★★☆

Editorial rating based on formula design, transparency, safety, value and user feedback. Not a clinical assessment.

Best for: adults with stress-driven trouble falling or staying asleep who want a low-melatonin, non-habit-forming option.

Skip if: you take antidepressants, you want a single-ingredient product, or you need results on night one.

Yu Sleep is a thoughtfully designed formula. You get a low melatonin dose, magnesium glycinate, GABA and L-theanine, and a liquid you can adjust, all of which are defensible choices backed by ingredient-level research. The main weaknesses are the proprietary blend, which keeps you from knowing exact doses, and the price. The 60-day guarantee lowers your risk of finding out whether it works for you, provided you buy from the official site and read the refund terms. We are an independent publisher, not the manufacturer, and we do not accept free product.

FAQ

Frequently asked questions about Yu Sleep

What is the official website for Yu Sleep?

The Yu Sleep official website is the brand's own order page, where checkout is processed by BuyGoods and the 60-day guarantee applies. It is the only authorized seller; the product is not on Amazon, eBay or in stores. The buttons on this page lead to that official site, and our checklist above shows how to confirm you are on the real checkout rather than a look-alike domain.

What is Yu Sleep used for?

Yu Sleep is a dietary supplement that supports falling asleep faster, staying asleep and waking up refreshed. It is not a drug and does not treat insomnia or any sleep disorder.

How exactly does Yu Sleep work?

The brand describes it as a reset for your sleep-pressure system, the natural build-up of tiredness across the day that modern light, stress and caffeine blunt. In practice the ingredients do three things: the low melatonin dose and tart cherry support your natural night signal, GABA, L-theanine, apigenin and lemon balm calm your nervous system so you fall asleep and stay asleep, and 5-HTP with B6 supports your own serotonin and melatonin over time.

Is Yu Sleep FDA approved?

No dietary supplement is FDA approved. According to the manufacturer, Yu Sleep is made in an FDA-registered, GMP-certified facility, which is the standard for supplements. The FDA does not evaluate its claims.

How much melatonin is in Yu Sleep?

0.9 mg per two-dropper serving. That is far below the 5–10 mg in most gummies and close to the 0.3–1 mg range researchers consider physiologic, which is why you are less likely to wake up groggy.

Is Yu Sleep habit forming?

No. None of the ingredients are controlled substances or known to cause dependence. You can stop at any time without withdrawal, unlike prescription sleep medication.

How long does it take for Yu Sleep to work?

Users report a calming effect within 30–45 minutes of a dose. The official page says most people notice easier sleep onset in the first one to three nights, fewer wake-ups within the first week and better morning energy by week two, with the full effect over one to two months. Independent reviewers more often describe two to four weeks. Individual results vary.

How fast will I get it?

The official site says orders ship within 24 hours in discreet packaging, arriving in 5 to 7 business days inside the US and 15 to 21 business days for international orders. Only the 6-bottle package ships free.

Can I take Yu Sleep every night?

It is designed for nightly use, and the manufacturer recommends a consistent bedtime routine for the best results. Talk to your doctor if you plan to use any sleep supplement for more than a few months.

Is Yu Sleep available on Amazon?

No. Yu Sleep is only sold through the official website. Amazon or eBay listings are unauthorized and are not covered by the 60-day guarantee. See our check of where to buy Yu Sleep and other marketplaces.

Is Yu Sleep legit or a scam?

The product is real, ships from the US and is sold through BuyGoods with a working refund process. Most "scam" complaints come from people who bought from look-alike websites or did not read the refund terms. Our Yu Sleep scam check covers the fake sites and the BBB record.

Is Yu Sleep the same as "You Sleep" or "U Sleep"?

Yes. "You Sleep" and "U Sleep supplement" are common misspellings of the same product. There is no separate "You Sleep" supplement from this manufacturer. Be careful with search results, because misspelled domains are sometimes used by unofficial sellers.

How do I contact Yu Sleep customer service?

The official contact page lists the email support@yu-sleep.com and the phone number +1 302-200-3480. Order, billing and refund lookups go through BuyGoods, the retailer that processes the official offer (support@buygoods.com, +1-302-404-2568). Every number and what each team can do is on our Yu Sleep customer service page, and the refund steps are in our Yu Sleep refund guide.

Where can I find more answers?

Our Yu Sleep questions and answers cover 30 common questions about taste, shipping, timing, storage and more before you buy.

Sources

  1. Zhdanova IV, et al. Melatonin treatment for age-related insomnia. J Clin Endocrinol Metab. 2001. pubmed.ncbi.nlm.nih.gov/11600532
  2. Abbasi B, et al. The effect of magnesium supplementation on primary insomnia in elderly. J Res Med Sci. 2012. pubmed.ncbi.nlm.nih.gov/23853635
  3. Yamatsu A, et al. Effect of oral γ-aminobutyric acid (GABA) administration on sleep. Food Sci Biotechnol. 2016. pubmed.ncbi.nlm.nih.gov/30263723
  4. Hidese S, et al. Effects of L-theanine administration on stress-related symptoms and cognitive functions. Nutrients. 2019. pubmed.ncbi.nlm.nih.gov/31623400
  5. Howatson G, et al. Effect of tart cherry juice on melatonin levels and enhanced sleep quality. Eur J Nutr. 2012. pubmed.ncbi.nlm.nih.gov/22038497
  6. National Center for Complementary and Integrative Health. Melatonin: What You Need To Know. nccih.nih.gov
  7. Yu Sleep official 2026 formula disclosure (GlobeNewswire press release, Aug 2026).
  8. Yu Sleep official order page and DTC landing page, testimonials, bonuses and pricing as displayed on October 14, 2026.