L-Theanine — the research behind it
The quiet note found in green tea.
An amino acid that occurs naturally in tea leaves. Studied for attention and for stress; the best-evidenced of the four here.
Online now, and at HAO mart.
TikTok Shop — opens in a new tab @dozoff_sg
HAO mart Outlets across Singapore, listed below
Bring the off switch.
We’re actively looking for distribution partners across Singapore. Dozoff is available at HAO mart outlets today — if you sell drinks, in a shop, on a menu, or online, we’d like to hear from you.
A Singapore block of flats at dusk. Night falls and one window lights warm; inside, a bedside lamp, a wooden nightstand, and a chilled Dozoff peach tea can. Morning returns.
Rest. Relax. Switch off.
Singapore
A non-carbonated peach tea relaxation drink. Now in Singapore.
Dozoff is a non-carbonated peach tea relaxation drink in a 250 ml slim can.
The brand comes from Malaysia, where it won Best Functional Beverage Brand at the ASEAN Food & Travel Award 2024. It is now arriving in Singapore.
What’s inside
L-Theanine · Magnesium · Valerian Root · Vitamin B6
The quiet note found in green tea.
An amino acid that occurs naturally in tea leaves. Studied for attention and for stress; the best-evidenced of the four here.
The mineral your evening runs on.
A dietary mineral found in leafy greens, nuts and grains. Studied for sleep and stress.
A botanical with a long bedtime history.
The root of Valeriana officinalis, long used in herbal preparations. Studied for sleep.
The vitamin you already eat.
Also called pyridoxine, a vitamin found in fish, poultry and bananas. Studied for anxiety.
Simple ingredients. Rest and relax.
Full ingredient list on can. Not a medicinal product. Read the research
Blk 69 Bedok South Avenue 3, Siglap Lucky Valley, 460069
Blk 220 Pasir Ris Street 21, 510220
Blk 505 Canberra Link, Montreal Spring, 750505
Blk 120 Potong Pasir Avenue 1, 350120
Blk 74 Whampoa Drive, Whampoa Court, 320074
6 Raffles Boulevard, Marina Square, 039594
Blk 205 Petir Road, 670205
Stock varies by outlet; call ahead for large quantities.
We’re actively looking for distribution partners across Singapore. Dozoff is available at HAO mart outlets today — if you sell drinks, in a shop, on a menu, or online, we’d like to hear from you.
Showing our work
Four ingredients, sixteen peer-reviewed human studies. Every one of them is set out here in full — what it looked at, how big it was, what it found, and where it came up short.
Strength of evidenceModerate evidence
A meta-analysis of 31 randomised trials found a real short-term effect on attention and a modest reduction in stress that its authors judged to be influenced by bias; a placebo-controlled crossover trial in healthy adults found significantly improved sleep-quality scores. The pooled effect on anxiety was not significant, and the sleep-specific evidence rests on a handful of small trials.
What it foundScores for depression, trait anxiety and sleep quality (PSQI) all decreased significantly after L-theanine (p = 0.019, 0.006 and 0.013 respectively), with improvements in sleep latency, sleep disturbance and use of sleep medication. Verbal fluency and executive function also improved, chiefly in participants with lower baseline scores. This is a small, 30-person crossover study — it is the most directly sleep-relevant L-theanine RCT in healthy adults, but it is not large.
PubMed 31623400 — opens in a new tabDOI 10.3390/nu11102362 — opens in a new tab
What it foundA single dose significantly improved choice reaction time (SMD = 0.51), and the pooled effect on stress was modest (SMD = 0.31) and, in the authors’ own assessment, influenced by bias. Effects on anxiety were inconsistent and non-significant, and there was no significant effect on fatigue; a reduction in depressive symptoms (SMD = 0.69, after excluding one outlier) was reported as needing confirmation. No serious adverse events.
NoteThis is the largest and most rigorous L-theanine synthesis available, but it evaluates cognitive and affective outcomes — it is not a review of sleep outcomes, and its anxiety result is null.
PubMed 42410082 — opens in a new tabDOI 10.1038/s41380-026-03727-9 — opens in a new tab
What it foundThe reviewers concluded that L-theanine supplementation may assist in reducing stress and anxiety in people exposed to stressful conditions. They explicitly called for longer-term studies in larger cohorts, i.e. the finding is suggestive rather than settled.
PubMed 31758301 — opens in a new tabDOI 10.1007/s11130-019-00771-5 — opens in a new tab
Null and mixed resultsNot every trial found an effect: in adults with a diagnosis of generalised anxiety disorder, L-theanine did not outperform placebo on anxiety or on insomnia severity — though self-reported sleep satisfaction did improve — and across the 31 pooled trials the effect on anxiety was inconsistent and not significant. The sleep-specific evidence base is small, and still developing.
Strength of evidenceMixed — still being studied
A meta-analysis of three randomised trials found participants fell asleep about 17 minutes sooner than those given placebo, and a placebo-controlled trial in older adults with insomnia reported significant improvements in sleep time, sleep efficiency and insomnia severity. Both sit on a thin base: the pooled trials are small, and their own authors grade the evidence low to very low quality.
What it foundPooled analysis showed sleep onset latency reduced by 17.36 minutes versus placebo (p = 0.0006), while the 16.06-minute improvement in total sleep time was not statistically significant. The authors state plainly that all trials were at moderate-to-high risk of bias and the outcomes were supported by low to very low quality evidence. Their case for magnesium rests partly on it being cheap and safe rather than on strong efficacy data.
PubMed 33865376 — opens in a new tabDOI 10.1186/s12906-021-03297-z — opens in a new tab
What it foundThe magnesium group showed statistically significant improvements in sleep time (p = 0.002), sleep efficiency (p = 0.03), Insomnia Severity Index score (p = 0.006) and sleep onset latency (p = 0.02), alongside higher serum melatonin (p = 0.007) and lower serum cortisol (p = 0.008). Caveat: this is a small single-centre trial in elderly insomnia patients, and it is one of the three trials that the Mah & Pitre meta-analysis (2.1) rated at moderate-to-high risk of bias.
PubMed 23853635 — opens in a new tabPMC3703169 — opens in a new tab
Null and mixed resultsNot every trial found an effect: a systematic review of nine studies concluded that the randomised evidence on magnesium and sleep is contradictory and the association uncertain, and a review of eighteen studies in anxiety-prone groups found mixed results — roughly half reported a benefit — with its reviewers describing the quality of the existing evidence as poor. The evidence base is still developing.
Strength of evidenceMixed — still being studied
Meta-analyses consistently find an improvement in subjectively rated sleep quality, and safety is consistently good across every review here. Those same reviews disagree with one another on efficacy, find no effect on objectively measured sleep latency, and document both publication bias and variable quality in the extracts tested.
Valerian is the ingredient where the published literature most openly disagrees with itself. All four references below are systematic reviews or meta-analyses, and they are presented together precisely because they do not reach the same conclusion.
What it foundThe authors concluded valerian could be a safe and effective herb to promote sleep and reduce anxiety, but attributed the inconsistent outcomes across trials to variable quality of the herbal extracts used, suggesting more reliable effects would be expected from whole root/rhizome preparations. They explicitly called for revised standardisation and quality-control processes. No severe adverse events were associated with valerian intake.
PubMed 33086877 — opens in a new tabDOI 10.1177/2515690X20967323 — opens in a new tab
What it foundSix studies reporting a dichotomous sleep-quality outcome showed a statistically significant benefit (relative risk of improved sleep = 1.8, 95% CI 1.2–2.9) — but the analysis showed evidence of publication bias, most studies had significant methodological problems, and doses, preparations and treatment duration varied considerably. The authors’ conclusion was hedged: valerian might improve sleep quality without side effects.
PubMed 17145239 — opens in a new tabDOI 10.1016/j.amjmed.2006.02.026 — opens in a new tab
What it foundSubjective sleep quality improved versus placebo (RR = 1.37, 95% CI 1.05–1.78), but the effect on sleep latency was essentially zero (mean difference 0.70 minutes, 95% CI −3.44 to 4.83). The authors concluded valerian appears effective for a subjective improvement in insomnia, and that its effectiveness has not been demonstrated on quantitative or objective measurements.
PubMed 20347389 — opens in a new tabDOI 10.1016/j.sleep.2009.12.009 — opens in a new tab
Null and mixed resultsThe reviews do not agree: one systematic review of 37 studies found that most showed no significant difference between valerian and placebo, and concluded the evidence does not support clinical efficacy as a sleep aid for insomnia — it is titled “safe but not effective”. The improvements above are in subjectively rated sleep rather than objectively measured sleep latency, and the evidence base is still developing. Safety is the one thing every review here agrees on.
Strength of evidenceEarly-stage evidence
A randomised trial in young adults found that a high dose of B6 reduced self-reported anxiety, alongside a marker its authors read as increased inhibitory GABA activity, consistent with B6’s known role in GABA synthesis. Sleep is the gap: no trial here shows that B6 on its own improves sleep quality, and the remaining sleep signal is cross-sectional association only.
Read this first. Vitamin B6 has the thinnest sleep-specific evidence base of the four ingredients. There is no meta-analysis of B6 for sleep quality. The strongest human data concern anxiety and stress, not sleep — and two of the four references below test B6 in combination with magnesium, so their effects cannot be attributed to B6 alone.
What it foundHigh-dose vitamin B6 reduced self-reported anxiety and increased surround suppression of visual contrast detection — a marker the authors interpret as increased inhibitory GABAergic neural activity, consistent with B6’s known role in GABA synthesis. B12 produced only trends toward change. B6 did not reliably influence binocular rivalry or tactile sensitivity. This trial did not measure sleep.
PubMed 35851507 — opens in a new tabDOI 10.1002/hup.2852 — opens in a new tab
What it foundHigher serum pyridoxal 5′-phosphate (the active form of B6) was associated with lower odds of daytime sleepiness (Q2 OR = 0.76, 95% CI 0.59–0.99; Q3 OR = 0.78, 95% CI 0.62–0.98) and with lower risk of very short, short and long sleep duration (e.g. RRR = 0.58, 95% CI 0.43–0.81 for Q4 vs very short sleep). The daytime-sleepiness association was significant only in males.
PubMed 36079774 — opens in a new tabDOI 10.3390/nu14173516 — opens in a new tab
Null and mixed resultsThis is the thinnest evidence base of the four, and the closing note is longer than the rest for that reason. Adding B6 to magnesium was no better than magnesium alone across a full study population, with a difference appearing only in a pre-specified severe-stress subgroup and no placebo arm to compare against; and the one randomised trial to look directly at sleep found more dream content recalled but no improvement in sleep quality, with its B-complex arm reporting worse sleep and more morning tiredness. No study here shows that B6 on its own improves sleep quality.
Searching. Structured queries were run against the PubMed / NCBI E-utilities API for each ingredient crossed with sleep, insomnia, sleep quality, stress, anxiety and relaxation terms, filtered where possible to the publication types Meta-Analysis, Systematic Review and Randomized Controlled Trial. Candidate records were then pulled in full for their bibliographic metadata and abstracts.
Verification. Every reference above was confirmed against at least two independent authoritative sources: the PubMed E-utilities record, which confirms PMID, exact title, author list, journal, year, volume, issue, pages, DOI and publication type; and the Crossref REST API or the DOI resolver landing on the publisher’s own record, which confirms the DOI is registered and that the registered metadata matches.
Summaries. Every plain-English summary above is drawn from the article’s own published abstract. Where a study was null, weak, mixed, or where the authors themselves flagged poor evidence quality, that is stated explicitly rather than smoothed over. Nothing has been upgraded in tone.
Contact
2 Venture Drive
#14-02 Vision Exchange
Singapore 608526
© 2026 Dozoff Singapore A brand of Renew Wellness Sdn Bhd
Dozoff is a drink, not a medicinal product. Full ingredient list on can.
About
Dozoff is a non-carbonated peach tea relaxation drink in a 250 ml slim can.
The brand comes from Malaysia, where it won Best Functional Beverage Brand at the ASEAN Food & Travel Award 2024. It is now arriving in Singapore.
Co-founder, Dozoff
Chin Wui Khong is a co-founder of Dozoff. A finance graduate of Universiti Malaya, he works across category creation, retail strategy and FMCG operations in Southeast Asia — building a consumer brand around the part of the day most drinks ignore.
Contact
2 Venture Drive
#14-02 Vision Exchange
Singapore 608526
© 2026 Dozoff Singapore A brand of Renew Wellness Sdn Bhd
Journal
Exhausted by six, wide awake by midnight. Why the body stays switched on after the work stops, and what closes the gap.
Winding down is the hour before bed, not the moment you lie down. What helps, roughly in order of how much difference it makes.
Dozoff had the pleasure of being part of the official launch of RingConn at Pickle Space, Petaling Jaya. It was an exciting and vibrant event filled with good energy, fun activities, and a great crowd.
Dozoff was invited once again to Fly FM! This time, for a special short podcast session. Big shoutout to the Fly FM team for having us back!
The energy was real! Dozoff showed up strong at SCORE Marathon 2025 REPC + Race Expo on 11โ12 July, and it was nothing short of amazing. The crowd came in early, the vibes were lively, and the excitement from runnersโฆ
Dozoff is officially on Fly FM! We've teamed up with one of Malaysia's top radio stations from Media Prima Berhad for an exciting new collaboration. You can now catch us on the EH! Breakfast Show with the amazing duoโฆ
Dozoff's Relax Booth - SME Open Day 25 was busy and loud, so we built a small chill booth right in the middle. A bright "Sip. Relax. Unwind." sign showed people where to go. Buckets of ice kept our Peach-Tea Dozoff cansโฆ
Raya but make it sporty. That's exactly what went down at the Dozoff X Challo Open House, a celebration that fused tradition with the lifestyle we live and breathe: movement, community, and a little friendly competition.
What a way to end the year. Sunday felt different, in the best way possible. We didn't just lace up and run... we ran, we cooked, we danced. The Final Dance 2024 was a whole vibe!
It's the continuous supports from our customers that helped us clinching another award.
In March 2023, myFITBOX brought Dozoff sampling sessions to three fitness studios.
Dozoff joins Naluri Hospital's corporate wellness programme in Malaysia.
Contact
2 Venture Drive
#14-02 Vision Exchange
Singapore 608526
© 2026 Dozoff Singapore A brand of Renew Wellness Sdn Bhd
Trade enquiries
We’re actively looking for distribution partners across Singapore. Dozoff is available at HAO mart outlets today — if you sell drinks, in a shop, on a menu, or online, we’d like to hear from you.
Retailers, wholesalers, F&B operators and e-commerce sellers are all invited to apply.
Retailers
Convenience, grocery, pharmacy and specialty shelves.
Wholesalers
Trade supply into the outlets a single listing will never reach.
F&B operators
Cafes, restaurants, hotels, gyms and workplace pantries.
E-commerce sellers
Marketplaces, your own storefront, and social commerce.
Partners
Retail
Distribution
Malaysia
Contact
2 Venture Drive
#14-02 Vision Exchange
Singapore 608526
© 2026 Dozoff Singapore A brand of Renew Wellness Sdn Bhd
Dozoff Singapore
This policy explains how [Singapore operating entity name] (UEN [UEN]) (“Dozoff”, “we”, “us” or “our”) handles personal data through the Dozoff Singapore website and related enquiries. We follow Singapore’s Personal Data Protection Act 2012, as amended, including the 2020 amendments (the “PDPA”).
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Registered address: 2 Venture Drive, #14-02 Vision Exchange, Singapore 608526
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Contact
2 Venture Drive
#14-02 Vision Exchange
Singapore 608526
© 2026 Dozoff Singapore A brand of Renew Wellness Sdn Bhd