The evening ritual
Deep Restore No.21
A quieter end to your day.
- Added melatonin
- 0 mg
- Ingredients, every dose on the label
- 8
- Since the classical formula where ours began
- 1,800 years
- Nights per pack
- 21
An evening herbal dietary supplement powder. Botanical night blend to support restful sleep.* 21 single-serve sticks. No added melatonin.
21 sticks · 3 g each · Mixed berry flavor
Our promise
30-day satisfaction guarantee
First order on zenthya.com: email info@zenthya.com within 30 days of delivery to request a refund. See our Refund Policy.
- No added melatonin
- No added sugarSweetened with monk fruit
- No artificial sweeteners
- Made in the USAWith domestic and imported ingredients
From the founder's ring
57 nights on my ring. Every night, from now on.
I travel a lot, and after six years of demanding work across time zones, my sleep has never been regular. Since August my Oura ring has logged 57 of my nights. Every one of my 20 crown nights was a night I'd had Deep Restore. From November, it's with me every night.
Justine, founder
- DeviceOura Ring, the same ring throughout
- NightsAug 1 – Oct 22, 2026 · 57 logged
- Crown nightOura sleep score 85 or higher
- ScheduleFrequent travel and time-zone changes
Out of 57 nights. The other 43 fall in between.
My 7 lowest nights (score under 75)
Averages of the 7 nights
5h 02mtotal sleep
- REM1h 20m
- Deep1h 02m
- Awake55m
- In bed (average)1:48 AM
My 7 highest nights (score 90+)
Averages of the 7 nights
7h 30mtotal sleep
- REM2h 07m
- Deep1h 20m
- Awake27m
- In bed (average)11:40 PM
With vs without
- +2h 28m sleep
- +47m REM
- In bed about 2 hours earlier
4 of the 7 nights without it were Friday or Saturday nights
One person's experience, not a study: Zenthya's founder, who owns the company. Oura Ring, August 1 – October 22, 2026, 57 nights logged. The card compares her 7 highest-scoring nights (90 or higher), all with Deep Restore, with her 7 lowest (below 75), all without it; the other 43 nights fall in between. Her schedule was not controlled: it included frequent travel, jet lag and weekend nights. Consumer wearables estimate sleep stages and can be off. Your results may vary.*
One stick, 2–3 fl oz of warm water.
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01
Stir
Stir one stick into 2–3 fl oz (60–90 mL) of warm water until dissolved.
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02
Sip slowly
Take it in the evening as the day winds down, as directed on the label. Do not exceed one stick per day.
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03
Why so little water?
Because the last thing you want before bed is a full glass. 21 pre-measured sticks: no scoop, no tub, nothing to measure. One pack, 21 evenings.
The formula
What goes into your evening.
Jujube seed (Ziziphus spinosa), reishi, poria and chamomile form the botanical and mushroom foundation of Deep Restore No.21. We pair them with glycine, L-theanine, GABA and magnesium. All amounts are per one 3 g stick. Open a card for the extract details and the research behind it.
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Jujube seed
The botanical heart of our formula.
600 mg per stick
About the extract and the research: Jujube seed
- The extract
- Ziziphus spinosa seed
18:1 seed extract
The seed of Ziziphus spinosa, known as jujube seed. - Why we chose it
- Our lead botanical connects Deep Restore No.21 with the herbal traditions that inspired our evening ritual. Its constituents, including jujubosides and spinosin, have been investigated for their interaction with GABA and serotonin signalling.
- What research saysTraditional amount
10–15 g of seed traditional≈ 10.8 g of seed in one stick
One stick has 600 mg of jujube seed extract made at about 18:1, which works out to roughly 10.8 g of seed. Traditional herbal references list 10 to 15 g of the seed a day, so one stick falls within that range. This card compares amounts only; it does not report a study result.
The 18:1 ratio comes from our supplier's certificate of analysis.
(Herbal pharmacopoeia dosage for the dried seed)
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Reishi
A fruiting-body extract.
300 mg per stick
About the extract and the research: Reishi
- The extract
- Ganoderma lucidum
10:1 fruiting-body extract
Reishi is a mushroom with a longstanding place in herbal traditions. We use its fruiting body, the recognizable mushroom structure. - What research saysStudied at a higher amount
2,000 mg in the study300 mg in one stick
In a double-blind, placebo-controlled study in Brazil, women aged 60 to 80 took 2,000 mg a day of a water extract of reishi fruiting body, the same kind of extract we use, for 8 weeks; 39 of the 60 who enrolled finished. In lab tests, their T cells (a type of white blood cell) responded differently from those of the placebo group. Blood counts and body composition did not differ between the groups.
Funded by Cruzeiro do Sul University and Brazilian public research agencies; the authors reported no conflicts of interest.
(Iser-Bem et al., British Journal of Nutrition, 2024) (opens in a new tab)
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Poria
Paired with jujube seed in our formula.
250 mg per stick
About the extract and the research: Poria
- The extract
- Wolfiporia cocos
10:1 sclerotium extract
Poria is a fungus used in herbal traditions. The extract comes from its sclerotium, a compact structure that grows underground.
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Chamomile
A familiar flower in evening traditions.
100 mg per stick
About the extract and the research: Chamomile
- The extract
- Matricaria recutita · flower
10:1 flower extract
Chamomile flower extract joins jujube seed, reishi, and poria in our evening blend. - What research saysStudied at a higher amount
400 mg in the study100 mg in one stick
In a single-blind randomized trial, 60 adults aged 60 and over at a day-care center in Iran took 200 mg of chamomile extract or a placebo capsule twice a day for 28 days. Afterward, the chamomile group scored better than the placebo group on a sleep-quality questionnaire.
Funded by the research council of Kashan University of Medical Sciences.
(Adib-Hajbaghery & Mousavi, Complementary Therapies in Medicine, 2017) (opens in a new tab)
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Glycine
An amino acid in our evening blend.
1,000 mg per stick
About the extract and the research: Glycine
- The extract
- Amino acid
An amino acid the body uses to make proteins and in nerve signalling. - Why we chose it
- Glycine is an amino acid the body uses to make proteins and in nerve signalling, which has prompted researchers to study its relationship with sleep. We include 1,000 mg in each stick.
- What research saysStudied at a higher amount
3 g in the study1 g in one stick
In a small crossover study, 11 adults who had been sleeping poorly took 3 g of glycine or a placebo before bed. With glycine, they rated their sleep better, and overnight sleep recordings showed they fell asleep sooner and reached deep (slow-wave) sleep sooner. They also reported feeling less sleepy during the day.
Three of the six authors worked for Ajinomoto Co.
(Yamadera et al., Sleep and Biological Rhythms, 2007) (opens in a new tab)
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L-Theanine
Studied in the context of rest.
200 mg per stick
About the extract and the research: L-Theanine
- The extract
- Amino acid, naturally found in tea
An amino acid naturally found in tea. - Why we chose it
- L-theanine has been studied in relation to stress and sleep. We include 200 mg in each stick alongside our botanical extracts.
- What research saysSame amount as one stick
200 mg in the study200 mg in one stick
In a randomized, double-blind, placebo-controlled crossover study, 30 healthy adults took 200 mg of L-theanine before bed each night for four weeks. Compared with placebo, they reported improvements on three parts of a sleep questionnaire, including how long it took to fall asleep. The overall questionnaire score did not differ significantly from placebo.
The study used L-theanine from Taiyo Kagaku, which funded the study; two of the authors worked for the company.
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GABA
One part of a considered formula.
100 mg per stick
About the extract and the research: GABA
- The extract
- Gamma-aminobutyric acid
A compound the body makes and uses in nerve signalling. - Why we chose it
- GABA is a compound the body makes and uses in nerve signalling, and oral GABA has been studied in relation to sleep. We include 100 mg in each stick as one part of the blend.
- What research saysSame amount as one stick
100 mg in the study100 mg in one stick
In a single-blind crossover study, 10 adults who said they slept poorly took 100 mg of GABA or a placebo, each for one week. Overnight brain-wave (EEG) recordings showed they fell asleep sooner and had more non-REM sleep while taking GABA.
A small, short study run by a GABA maker: all five authors worked for Pharma Foods International.
(Yamatsu et al., Food Science and Biotechnology, 2016) (opens in a new tab)
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Magnesium
A clearly stated mineral contribution.
30 mg elemental per stick
About the extract and the research: Magnesium
- The extract
- As magnesium bisglycinate · 7% Daily Value
Magnesium bisglycinate, a form in which magnesium is bound to glycine. 30 mg elemental magnesium per stick, as declared on our label. - Why we chose it
- Magnesium is an essential mineral involved in normal nerve and muscle function. We use magnesium bisglycinate, a form bound to glycine; each stick provides 30 mg of elemental magnesium, the amount declared on our Supplement Facts panel.
- What research saysStudied at a higher amount
250 mg in the study30 mg in one stick
In a randomized, double-blind, placebo-controlled trial, 155 adults who reported poor sleep took 250 mg of magnesium, as magnesium bisglycinate, or a placebo before bed for four weeks. The magnesium group improved slightly more than the placebo group on a sleep questionnaire, a difference the researchers called small. Scores on the other questionnaires did not differ.
Funded by Leibniz University Hannover. The bisglycinate form also supplied about 1.5 g of glycine a day.
(Schuster et al., Nature and Science of Sleep, 2025) (opens in a new tab)
Ingredient 1 of 8
These studies looked at single ingredients. Each card shows the amount the study used next to the amount in one stick. See all studies.
A few things to know
Your questions, answered.
What does it taste like?
It has a mixed-berry flavor. The full ingredient list includes natural flavor, monk fruit extract, and citric and malic acids.
Does it contain melatonin?
No melatonin is added. Some plants, including jujube seed, can contain tiny natural amounts of melatonin. We haven't measured it in our extract, so we say "no added melatonin" and nothing stronger. Explore the full ingredient list and amounts.
Can I take it with medications or other supplements?
From our label: consult your physician before use if you are taking medication (especially sedatives, blood thinners or blood-pressure medication) or have a medical condition. If you already use melatonin or another sleep product, ask your doctor or pharmacist before combining them. Each stick has 30 mg of elemental magnesium; if you take a magnesium supplement, count it in your daily total.
What if I'm pregnant or nursing?
From our label: consult your physician before use if you are pregnant or nursing. If you are planning a pregnancy, we suggest asking your doctor too. Deep Restore No.21 is not intended for children.
Can I drive after taking it?
Take it in the evening, once you're done driving for the day. As our label says, use caution when driving or operating machinery after use.
What if it doesn't agree with me?
From our label: discontinue use and consult a doctor if adverse reactions occur.
How soon will I notice a difference?
Everyone is different, so we won't promise a timeline. Take one stick each evening as part of winding down; one pack covers 21 evenings. If you have persistent sleep concerns, talk to your doctor.
When will my pre-order ship?
Deep Restore No.21 pre-orders ship November 1st 2026. This is the expected shipping time, not the delivery date. Delivery time depends on your destination and carrier.
Can I cancel my pre-order?
You may cancel your pre-order for a full refund before it enters fulfillment. Email info@zenthya.com with your order number. Once it enters fulfillment or has shipped, our Refund & Return Policy applies.
What is your satisfaction guarantee?
Eligible first-time purchases made directly through Zenthya.com are covered by our 30-day satisfaction guarantee. If you are not satisfied, contact info@zenthya.com within 30 days of receiving your order with your order number, the email used at checkout and a brief description of your concern. Refund requests are subject to approval; see our Refund & Return Policy for full terms.
Deep Restore No.21
Make room for your evening.
One stick, 2–3 fl oz of warm water, and a little time to unwind.
- 21 evenings
- No added melatonin
- Ships November 1st
$26.95Early-bird pre-order · $39.95 after launch
Your Night Log
Keep your own Night Log.
A simple record of your evenings and mornings while you build a nightly routine. Same device, or the paper log, every night.
Sleep moves from week to week with your schedule, light, caffeine, alcohol, travel and the seasons. A log can show you what changed. It can't tell you why.
How to use this log
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Before you start
Choose one device and keep it.
Wear the same ring, watch or headband every night, or use the paper log. Different devices measure sleep differently, so switching midway makes your weeks hard to compare.
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Week 1 · Baseline
Note a week of your usual nights.
For seven nights, write down when you went to bed, how rested you felt in the morning (1 to 5), and how often you remember waking. You can start before your box arrives.
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Weeks 2–4 · Deep Restore
Keep logging while you take one stick a day, as directed on the label.
One line each morning is enough.
My Night Log
Blank template. Your numbers go here.
| Week 1Baseline | Week 2Deep Restore | Week 3Deep Restore | Week 4Deep Restore | |
|---|---|---|---|---|
| Felt rested (1–5)weekly average | blank | blank | blank | blank |
| Times I remember wakingweekly average | blank | blank | blank | blank |
| Time awake after falling asleepdevice estimate, min | blank | blank | blank | blank |
| Devicesame all weeks | blank | blank | blank | blank |
- Felt rested (1–5)weekly average
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- Times I remember wakingweekly average
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- Time awake after falling asleepdevice estimate, min
- blank
- Devicesame all weeks
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- Felt rested (1–5)weekly average
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- Times I remember wakingweekly average
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- Time awake after falling asleepdevice estimate, min
- blank
- Devicesame all weeks
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- Felt rested (1–5)weekly average
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- Times I remember wakingweekly average
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- Time awake after falling asleepdevice estimate, min
- blank
- Devicesame all weeks
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- Felt rested (1–5)weekly average
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- Times I remember wakingweekly average
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- Time awake after falling asleepdevice estimate, min
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- Devicesame all weeks
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The printable log
Download the PDFWhat to look at
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Weekly averages, not single nightsHow rested you felt, and how often you remember waking.
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Device numbers are estimatesThey vary between devices, so compare your weeks on the same one.
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Use sleep-stage % as a referenceEstimates such as "deep sleep %" vary between devices, so don't rely on them alone. Pay attention to how recovered you feel, too.
Send us your log
Email a photo of your paper log, or just your weekly numbers. We'll reply with a simple summary of your weeks.
Want a closer look at your sleep? Ask for a free consultation and a personal report. Just say so in your email.
By sending your log you agree that we use it only to reply to you. We don't sell it or use it in marketing. A summary or consultation is not medical advice. See our Privacy Policy.
Your Night Log is a personal record, not a medical test.