AGZ and the New Sleep-Supplement Era: What Does the Evidence Actually Support?
One-Minute Read
AGZ is the new nighttime supplement from AG1. Several of its principal ingredients are present at doses reasonably close to amounts evaluated in human sleep research, including magnesium L-threonate, L-theanine and saffron. Glycine, ashwagandha and several additional botanicals also have varying degrees of clinical support.
The formulation is more thoughtful than many multi-ingredient sleep products, particularly because several key ingredients are individually disclosed and used at clinically recognizable doses. AGZ is also melatonin-free, which may appeal to people looking for a broader nighttime formula rather than a product centered on exogenous melatonin.
The main limitation is that evidence for individual ingredients does not establish the effectiveness of the finished combination. At the time of this review, HormoneSynergy® could not identify a published randomized controlled trial of AGZ itself. Even so, the ingredient profile is credible enough that AGZ may certainly be worth considering for selected patients once the full clinical context is understood. HormoneSynergy® will also be looking into whether AGZ becomes available directly through practitioner channels.
Sleep has become a substantial consumer market. People now encounter cooling mattresses, wearable sleep trackers, blue-light glasses, breathing programs, mouth tape, magnesium in several forms, melatonin, glycine, L-theanine, adaptogens and increasingly complex botanical combinations. Some of these approaches are supported by useful evidence, while others rely more heavily on biological plausibility or marketing. AGZ stands out because several components of its formulation are supported by human research and are included at clinically recognizable doses.
AGZ is the nighttime drink produced by AG1, the company best known for its daily greens supplement. The product is positioned as a melatonin-free nighttime routine intended to support relaxation, sleep quality and morning functioning. Compared with many products in this category, the formulation appears relatively deliberate: several major ingredients are dose-disclosed, some align reasonably well with the clinical literature, and the company has chosen a multi-pathway approach rather than relying on a single sleep ingredient.
HormoneSynergy® evaluates products such as AGZ by reviewing the formulation, comparing disclosed doses with published research, considering whether the populations and preparations studied resemble the product being sold, and distinguishing evidence for individual ingredients from evidence for the finished formula.
What Is in AGZ?
According to the current AGZ label, one serving provides 250 mg of magnesium from magnesium L-threonate and magnesium bisglycinate, along with 2 grams of glycine, 1 gram of myo-inositol, 300 mg of ashwagandha leaf extract, 200 mg of L-theanine and 28 mg of saffron extract. It also supplies 12 mg of zinc and 5 mg of vitamin B6.
The product additionally contains a 2.4-gram “Calming Herbs & Antioxidant Blend” composed of chamomile, phosphatidylserine, valerian, tart cherry, lemon balm, kiwi, Baikal skullcap, passionflower, lavender and holy basil. Because the amounts of these individual ingredients are not provided, they cannot be compared directly with doses used in clinical trials.
| Ingredient | AGZ Amount | Evidence Perspective |
|---|---|---|
| Magnesium | 250 mg, including 2,000 mg Magtein® magnesium L-threonate plus magnesium bisglycinate | Encouraging human evidence, although the literature remains limited. |
| L-theanine | 200 mg | Within a commonly studied range and supported by a growing body of sleep research. |
| Saffron extract | 28 mg | Closely matches doses evaluated in randomized trials of adults reporting poor sleep. |
| Glycine | 2 g | Promising and reasonably close to commonly studied bedtime doses. |
| Ashwagandha | 300 mg | Supported by a modest clinical literature, with stronger effects in some higher-dose and longer-duration studies. |
| Myo-inositol | 1 g | Biologically plausible, though less established as a primary sleep intervention. |
| Botanical blend | 2.4 g total across 10 ingredients | Contains several ingredients with some sleep-related research, although individual doses are not disclosed. |
Magnesium L-Threonate and Sleep
Magnesium has been studied in relation to sleep for many years, although the literature is heterogeneous and the effects cannot be generalized across all forms of magnesium or all people with sleep complaints. Different formulations have different pharmacokinetic properties, study populations vary substantially, and correction of inadequate magnesium intake should not be equated with treatment of chronic insomnia.
Magnesium L-threonate has attracted particular interest because it was developed to increase magnesium delivery to the nervous system. A 2024 randomized, double-blind, placebo-controlled trial included 80 adults between 35 and 55 years of age who reported sleep problems. Participants received magnesium L-threonate or placebo for 21 days. The investigators reported improvements in several subjective outcomes and selected Oura Ring measures among participants receiving magnesium L-threonate, including some sleep-stage and daytime-functioning measures.
A subsequent randomized trial evaluated 2 grams of Magtein® daily for six weeks in 100 adults reporting dissatisfaction with sleep. Several cognitive measures and measures of sleep-related impairment improved, while a number of other subjective sleep outcomes and objective wearable-derived sleep measures did not differ significantly between groups. Taken together, the data are encouraging enough to support continued interest in magnesium L-threonate, while still leaving room for larger and more independent trials.
Magnesium L-threonate options
For those who prefer magnesium L-threonate as a standalone supplement rather than as one component of a larger sleep formula, HormoneSynergy® carries several options. The appropriate form and dose should still be considered in the context of total magnesium intake, kidney function, medications and the reason the supplement is being used.
L-Theanine
L-theanine is an amino acid naturally present in tea and has been studied for its effects on relaxation, stress and sleep without acting as a conventional hypnotic medication. A 2025 systematic review and meta-analysis evaluated 19 articles involving 897 participants and reported modest improvements in subjective sleep-onset latency, daytime dysfunction and overall subjective sleep quality. The authors also noted that relatively few studies evaluated isolated L-theanine rather than combination products.
A later systematic review included trials using doses ranging from approximately 50 to 900 mg per day and concluded that 200 to 450 mg per day appears to be a reasonable range for supporting sleep in adults, while emphasizing the need for additional high-quality trials. AGZ provides 200 mg, which is a sensible formulation choice and falls within the range commonly evaluated in the literature.
Saffron
Standardized saffron extracts have accumulated an interesting body of research involving both mood and sleep. In a randomized, double-blind trial of adults reporting poor sleep, saffron was associated with improvement in several sleep-related outcomes. A subsequent randomized, placebo-controlled multi-dose study evaluated standardized saffron in adults with poor sleep, including a 28 mg daily dose.
AGZ provides 28 mg of saffron extract, which is consistent with amounts used in several randomized human trials. Among the ingredients in the formula, saffron is one of the clearer examples of AG1 selecting a dose that can be compared directly with the published literature.
Ashwagandha
Ashwagandha is widely used in supplements intended for stress, sleep and general well-being. A systematic review and meta-analysis of five randomized controlled trials involving 400 adults found a small but statistically significant improvement in overall sleep. Benefits were more pronounced among participants with insomnia, in studies lasting at least eight weeks and in studies using doses of 600 mg per day or more.
AGZ provides 300 mg of ashwagandha leaf extract. Differences among extracts make direct dose comparisons imperfect, and a multi-ingredient formulation may perform differently from an isolated extract. The dose is reasonable, although it should not be assumed to reproduce the results of higher-dose studies.
Ashwagandha also warrants attention to individual context. Thyroid function, autoimmune disease, medications, pregnancy and rare reports of liver injury associated with ashwagandha-containing products may be relevant when deciding whether it is appropriate. Always check with your health care provider first if any of the above conditions apply to you.
Ashwagandha option
For those considering ashwagandha as a standalone supplement rather than as part of a larger sleep formula, HormoneSynergy® carries Ashwagandha with Shoden® standardized withanolide glycosides. As with other adaptogenic herbs, the formulation, dose, medications and individual clinical context should be considered before use.
Glycine
Glycine is an amino acid involved in neurotransmission, thermoregulation and several other physiologic processes. Small human studies have reported improvements in subjective sleep quality and next-day fatigue when glycine is taken before bed. Many of the frequently cited sleep studies have used approximately 3 grams.
AGZ provides 2 grams. That dose is somewhat lower than the amount used in several well-known studies, but it remains close enough to the published research to be clinically relevant rather than merely decorative.
The Proprietary Botanical Blend
The remaining blend contains chamomile, phosphatidylserine, valerian, tart cherry, lemon balm, kiwi, Baikal skullcap, passionflower, lavender and holy basil in a combined amount of 2.4 grams. Several of these ingredients have biological plausibility or some human research related to sleep, stress or relaxation.
The main limitation is dose transparency. Without knowing the amount of each ingredient, it is not possible to determine whether the formulation approximates doses used in published studies. The blend may still contribute meaningfully to the finished product, particularly because several of the ingredients have complementary calming or sleep-related mechanisms, but the evidence cannot be evaluated with the same precision as ingredients whose quantities are disclosed individually.
A Melatonin-Free Formulation
AGZ is intentionally formulated without melatonin, and there is a reasonable clinical rationale for that decision. Melatonin plays an important role in circadian signaling and can be useful in selected sleep disorders, particularly when circadian timing is involved, but it has increasingly become a default sleep supplement even though many causes of poor sleep are unrelated to insufficient melatonin.
A formula designed around relaxation, stress modulation and sleep quality rather than exogenous melatonin is a reasonable approach. For people who prefer not to use melatonin routinely, that may be one of the more appealing features of AGZ.
Evidence for the Ingredients and Evidence for the Finished Formula
Randomized controlled trials are available for magnesium L-threonate and saffron. L-theanine has been evaluated in controlled trials and systematic reviews, while ashwagandha has been studied in randomized trials and meta-analysis. Glycine and several of the botanicals have smaller bodies of research.
Those studies provide a credible scientific foundation for parts of the formula, but they do not establish the effectiveness of AGZ as a finished multi-ingredient product. At the time of this review, HormoneSynergy® could not identify a published randomized, placebo-controlled human trial evaluating the complete AGZ formulation for sleep onset, sleep maintenance, sleep architecture, morning alertness or long-term sleep outcomes.
AG1 has invested in clinical research on other products, and a well-designed trial of AGZ would be a valuable next step. Until those data are available, the fairest interpretation is that AGZ is a promising, evidence-informed formulation whose individual ingredients are supported to varying degrees, while the complete product still needs direct clinical validation.
Why Is Sleep Being Disrupted?
For people with persistent sleep problems, the more important clinical question is usually not which supplement to select, but what is disrupting sleep. Someone whose circadian rhythm has shifted later does not necessarily require the same intervention as a woman waking repeatedly because of menopausal hot flashes, a person with chronic insomnia, or someone experiencing repeated arousals from obstructive sleep apnea.
Cognitive behavioral therapy for insomnia, or CBT-I, remains an important initial treatment for chronic insomnia and is supported by sleep-medicine guidelines. Obstructive sleep apnea requires a different evaluation. Loud snoring, witnessed pauses in breathing, gasping during sleep, morning headaches and excessive daytime sleepiness are among the symptoms that should raise concern. Women may present with fatigue, insomnia or less stereotypical symptoms and may therefore be overlooked when screening focuses only on the classic picture of a loudly snoring, sleepy man.
Other contributors to poor sleep include menopause-related hot flashes and night sweats, restless legs syndrome or iron deficiency, alcohol use, late caffeine exposure, pain, nocturia, reflux, depression or anxiety, thyroid dysfunction, medications that interfere with sleep, circadian disruption, shift work, inadequate daytime light exposure, excessive nighttime light and digital stimulation, and an uncomfortable sleep environment.
A supplement may improve one aspect of sleep physiology while leaving an underlying sleep disorder untreated, so persistent or progressive symptoms still deserve a broader evaluation.
Sleep and Longevity
Sleep is central to metabolic regulation, blood-pressure control, mood, learning, memory, immune function, appetite regulation and recovery from exercise. Persistent sleep disruption therefore deserves attention within a broader longevity assessment, but the evaluation should extend beyond supplement selection.
At HormoneSynergy®, sleep concerns are evaluated by looking at the pattern of disruption as well as the broader clinical context. Difficulty falling asleep, repeated awakenings and early-morning awakening can have different causes. Snoring, witnessed apnea, morning symptoms, menopausal complaints, changes in body composition, medications, supplements, caffeine, alcohol and daytime sleepiness all contribute useful information. Formal sleep testing may be appropriate when the history raises concern for a sleep disorder.
A careful clinical history often provides more actionable information than the length of a supplement ingredient list.
Supplement Stacking and Total Exposure
Complex nighttime formulas also need to be considered within the entire supplement and medication regimen. Someone taking AGZ may already be using a multivitamin, additional magnesium, zinc, a B-complex, separate ashwagandha, other relaxation products or prescription medications.
AGZ already provides 250 mg of magnesium, 12 mg of zinc and 5 mg of vitamin B6 in addition to multiple botanicals. These quantities do not make the product inherently unsafe, but total daily exposure should include every product being used. Duplication becomes particularly relevant when multiple formulations contain the same vitamins, minerals or herbs, and sedating botanicals also warrant consideration when prescription sedatives, alcohol or other central nervous system depressants are present.
HormoneSynergy® Perspective on AGZ
AGZ is a thoughtfully constructed sleep supplement with a stronger scientific rationale than many multi-ingredient products in this category. Several principal ingredients have human randomized-trial data, and L-theanine and saffron are present at amounts that correspond well with published studies. Magnesium L-threonate has emerging controlled-trial evidence, glycine is present at a clinically meaningful amount, and the decision to formulate without melatonin is reasonable.
The limitations remain important but do not negate the strengths of the formulation. Ashwagandha research has shown stronger effects in some studies at higher daily doses and with longer treatment periods. Ten additional ingredients are contained within a proprietary blend whose individual amounts cannot be assessed. Like most supplements, the finished AGZ formula also has not yet been validated in a published randomized controlled trial.
Within those boundaries, AGZ appears more credible than many sleep products built primarily around marketing language and token ingredient amounts. HormoneSynergy® considers the formulation interesting enough that it may be worth evaluating for use within the clinic or dispensary, particularly for people who prefer a consolidated nighttime formula. We will also be checking whether AGZ becomes available directly through practitioner channels so that, if appropriate, it could be offered within the same clinical and quality-review framework used for other supplements.
The HormoneSynergy® Perspective
AGZ contains several ingredients with credible human research behind them, and portions of the formula are dosed in a way that can be compared meaningfully with published studies. The product appears thoughtfully formulated and may be a reasonable option for selected people, particularly when the goal is a melatonin-free, multi-ingredient nighttime supplement. The appropriate role still depends on the cause of the sleep problem, the rest of the supplement and medication regimen, and whether a treatable sleep disorder is present.
Selected References
- Hausenblas HA, et al. Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems: a randomized controlled trial. Sleep Medicine X. 2024. PMID: 39252819.
- Lopresti AL, Smith SJ. The effects of magnesium L-threonate (Magtein®) on cognitive performance and sleep quality in adults: a randomized, double-blind, placebo-controlled trial. Frontiers in Nutrition. 2026. PMID: 41601871.
- Bulman A, et al. The effects of L-theanine consumption on sleep outcomes: a systematic review and meta-analysis. Sleep Medicine Reviews. 2025;81:102076. PMID: 40056718.
- Lopresti AL, et al. Effects of saffron on sleep quality in healthy adults with self-reported poor sleep: a randomized, double-blind, placebo-controlled trial. Journal of Clinical Sleep Medicine. 2020. PMID: 32056539.
- Lopresti AL, et al. An investigation into an evening intake of a saffron extract on sleep quality, cortisol, and melatonin concentrations in adults with poor sleep: a randomized, double-blind, placebo-controlled, multi-dose study. Sleep Medicine. 2021. PMID: 34438361.
- Cheah KL, et al. Effect of Ashwagandha (Withania somnifera) extract on sleep: a systematic review and meta-analysis. PLoS One. 2021;16:e0257843. PMID: 34559859.
- American Academy of Sleep Medicine. Clinical guidance on behavioral and psychological treatments for chronic insomnia disorder in adults.
- National Heart, Lung, and Blood Institute. Sleep Apnea: Symptoms.
Frequently Asked Questions
Does AGZ contain melatonin?
No. AGZ is formulated without melatonin. Its principal sleep-related ingredients include magnesium, glycine, myo-inositol, ashwagandha, L-theanine, saffron and several botanicals.
Has AGZ itself been proven to improve sleep?
Several individual AGZ ingredients have been investigated in human clinical trials. At the time of this review, however, HormoneSynergy® could not identify a published randomized, placebo-controlled clinical trial evaluating the finished AGZ formulation itself. The ingredient profile is evidence-informed, but direct research on the complete product would strengthen the case considerably.
Is magnesium L-threonate proven to improve sleep?
Randomized trials have reported improvements in selected subjective outcomes and some sleep-related measures. The evidence is encouraging, although still relatively limited and not every objective sleep outcome has improved consistently across studies.
Can AGZ replace evaluation for insomnia or sleep apnea?
No. Persistent insomnia, loud snoring, witnessed pauses in breathing, gasping, morning headaches, daytime sleepiness and frequent nighttime awakening may warrant medical evaluation. A supplement may support sleep but does not diagnose or treat obstructive sleep apnea.
Could HormoneSynergy® offer AGZ?
Possibly. The formulation is scientifically credible enough to warrant further review, and HormoneSynergy® will be looking into whether AGZ becomes available through practitioner channels. Any decision to offer it would still be based on formulation quality, access, clinical fit and how it complements the rest of the HormoneSynergy® supplement portfolio.
Medicine, Not Marketing.
HormoneSynergy® reviews supplements, medications, diagnostic testing and longevity strategies by distinguishing biological plausibility, human clinical evidence and areas where evidence remains incomplete. Explore more physician-led analysis in the HormoneSynergy® Resource Library.
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Medical disclaimer: This article is for educational purposes and is not intended to diagnose, treat, cure or prevent disease or replace individualized medical care. Dietary supplements can interact with medications and may not be appropriate for everyone. Discuss persistent sleep problems and supplement use with a qualified healthcare professional.
This article is part of the HormoneSynergy® Longevity Medicine education series covering preventive cardiology, metabolic health, hormone optimization, body composition, and advanced diagnostics for healthy aging.
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