CanPrev L-Theanine with Magnesium - Calm & Relax | 90 Caps
Visit the CanPrev Store| Brand | CanPrev |
| Serving | 1 capsule, once daily |
| Licensed Natural Health Product | NPN 80037616 |
| Quality Standards | GMP-compliant facility |
| Country | Made in Canada  |
About this item
- TWO REAL ACTIVES, FULLY DOSED: CanPrev L-Theanine with Magnesium combines 250 mg of L-Theanine and 20 mg of magnesium (as magnesium bisglycinate) in one vegetable capsule - every amount printed on the label, no proprietary blend.
- THE AUTHORIZED USE: Health Canada licenses this product to help temporarily promote relaxation.
- L-THEANINE FROM GREEN AND BLACK TEA: 250 mg of L-Theanine, the amino acid naturally found in green and black tea leaves, in a standalone once-daily capsule.
- MAGNESIUM BISGLYCINATE FOR ABSORPTION: 20 mg of magnesium chelated to glycine (magnesium bisglycinate) - a form studied for better gut tolerance and absorption than inorganic magnesium salts.
- SIMPLE, ONCE-DAILY DOSING: Adults take just 1 capsule per day. 90 vegetable capsules per bottle - a 90-day supply at the labelled dose.
- VEGAN, NON-GMO & FREE FROM COMMON ALLERGENS: A clean formula - vegan, non-GMO, gluten-free, dairy-free, soy-free, sugar-free and corn-free, with no artificial colours, flavours or preservatives. Formulated in Canada.
Product Description
L-Theanine with Magnesium - Calm Without the Crash
CanPrev L-Theanine with Magnesium pairs 250 mg of L-Theanine, the amino acid naturally found in green and black tea, with 20 mg of magnesium bisglycinate to support absorption. Helps to temporarily promote relaxation, in a simple once-daily vegetable capsule. A vegan, non-GMO, gluten-free formula, free from common allergens. Licensed Natural Health Product NPN 80037616.
CanPrev L-Théanine avec Magnésium associe 250 mg de L-Théanine, l'acide aminé présent naturellement dans le thé vert et le thé noir, à 20 mg de bisglycinate de magnésium pour favoriser l'absorption. Aide à promouvoir temporairement un état de relaxation, en une seule capsule végétale par jour. Formule végane, sans OGM et sans gluten, exempte des allergènes courants. Produit de santé naturel homologué. NPN 80037616.
One Capsule, Two Real Actives
250 mg L-Theanine (green and black tea) + 20 mg Magnesium Bisglycinate - vegan vegetable capsules
250 mg of Pure L-Theanine
The full 250 mg per capsule comes from the amino acid naturally found in green and black tea leaves - a single, standalone dose with no fillers or blends.
20 mg Magnesium Bisglycinate
Magnesium chelated to glycine, added to support absorption alongside the L-Theanine dose - the same chelated form used across CanPrev's magnesium products for gut tolerance.
Transparent, Fully-Dosed Label
Both of the 2 medicinal ingredients and their exact amounts are printed on the label - no proprietary blend, no hidden fillers.
Simple, Once-Daily Dosing
Take 1 capsule per day. 90 vegetable capsules per bottle - a 90-day supply at the labelled dose. Vegan, non-GMO, gluten-free.
Advanced Ingredients, Superior Results
CanPrev L-Theanine with Magnesium pairs 250 mg of L-Theanine, the amino acid naturally found in green and black tea, with 20 mg of magnesium bisglycinate to support absorption. Helps to temporarily promote relaxation, in a simple once-daily vegetable capsule. A vegan, non-GMO, gluten-free formula, free from common allergens.
L-Theanine
A naturally occurring amino acid found in tea leaves, studied for its role in promoting relaxation without sedation.
250 mg (from green and black tea)
Magnesium
Magnesium chelated to the amino acid glycine, a form studied for improved absorption and gastrointestinal tolerance compared to inorganic magnesium salts.
20 mg (as magnesium bisglycinate)CanPrev L-Theanine + Magnesium: Supplement Facts
Each Vegetable Capsule contains:
- L-Theanine (green and black tea)250 mg
- Magnesium (magnesium bisglycinate)20 mg
Non-Medicinal Ingredients: Non-medicinal ingredients: Hypromellose (vegetable capsule), magnesium stearate. Vegan, non-GMO, gluten-free, dairy-free, soy-free, sugar-free, corn-free; no artificial colours, flavours or preservatives.
Recommended Use or Purpose: Helps to temporarily promote relaxation.
Recommended Dose (Adults 19 years and older): Take 1 vegetable capsule per day, or as directed by a health care practitioner.
Cautions and Warnings: Consult a health care practitioner prior to use if you are pregnant or breastfeeding. Hypersensitivity (e.g. allergy) has been known to occur; if it occurs, discontinue use. Some people may experience drowsiness; exercise caution if operating heavy machinery, driving a motor vehicle or engaging in activities requiring mental alertness. Do not use if the safety seal is broken. Keep out of reach of children. Store in a cool, dry place. Known Adverse Reactions: Some people may experience mild digestive upset (e.g. constipation) or, in rare cases, irritability or insomnia; if these occur, discontinue use.
Actual product packaging and materials may contain more and different information than shown on our website. Always read labels, warnings and directions before using or consuming a product. Formulated in Canada by CanPrev Natural Health Products Ltd. This item is sold and shipped by Amazon.ca; purchases are completed on Amazon.
Chaque capsule végétale contient :
- L-Théanine (thé vert et thé noir)250 mg
- Magnésium (bisglycinate de magnésium)20 mg
Ingrédients non médicinaux : Ingrédients non médicinaux : Hypromellose (capsule végétale), stéarate de magnésium. Végane, sans OGM, sans gluten, sans produits laitiers, sans soya, sans sucre, sans maïs; sans colorants, arômes ou agents de conservation artificiels.
Usage ou fins recommandés : Aide à promouvoir temporairement un état de relaxation.
Dose recommandée (adultes de 19 ans et plus) : Prendre 1 capsule végétale par jour, ou selon les indications d'un praticien de la santé.
Mises en garde et précautions : Consultez un praticien de la santé avant l'usage si vous êtes enceinte ou allaitez. Une hypersensibilité (par ex. allergie) a été signalée; le cas échéant, cessez l'usage. Certaines personnes peuvent ressentir de la somnolence; soyez prudent si vous conduisez un véhicule, utilisez de la machinerie lourde ou effectuez des activités nécessitant de la vigilance. Ne pas utiliser si le sceau de sécurité est brisé. Garder hors de la portée des enfants. Conserver dans un endroit frais et sec. Réactions indésirables connues : Certaines personnes peuvent ressentir des troubles digestifs légers (par ex. constipation) ou, rarement, de l'irritabilité ou de l'insomnie; le cas échéant, cessez l'usage.
NPN 80037616
Add CanPrev L-Theanine with Magnesium to your daily routine
Get CanPrev L-Theanine with Magnesium on Amazon.ca - fast, protected delivery.
Get it on Amazon.caWhy CanPrev L-Theanine with Magnesium
A simple, Health Canada-licensed two-ingredient formula pairing L-Theanine with magnesium bisglycinate for absorption.
Two real actives, fully dosed
250 mg L-Theanine and 20 mg magnesium bisglycinate - every amount printed on the label, no proprietary blend.
One clear authorized use
Health Canada licenses this product to help temporarily promote relaxation - not a long list of vague wellness claims.
Chelated magnesium for absorption
Magnesium bisglycinate - magnesium bound to glycine - a form studied for better gastrointestinal tolerance and absorption than inorganic magnesium salts.
Trusted Canadian brand
CanPrev - formulated in Canada, licensed under Health Canada NPN 80037616, made in a GMP-compliant facility.
Inside every capsule
Two real actives in one vegetable capsule - 250 mg of L-Theanine paired with 20 mg of magnesium bisglycinate, in a simple once-daily dose.
How to use it
Take 1 capsule per day
Adults (19 years and older): take one (1) vegetable capsule per day, or as directed by a health care practitioner.
Swallow with water
Take the vegetable capsule whole with a glass of water.
Consult before combining with medications
Consult a health care practitioner before use if you are pregnant or breastfeeding, or if you are taking other health products or medications.
What the research says about this formula's ingredients
Educational summaries of published research on L-Theanine and magnesium (including magnesium bisglycinate), including honest null and mixed findings - these are ingredient-level summaries, not claims about this finished product. CanPrev L-Theanine with Magnesium's own claim is the authorized use under NPN 80037616: helping to temporarily promote relaxation.
An L-Theanine drink reduced subjective stress and cortisol after a mental stressor
In a randomised, double-blind, placebo-controlled crossover trial of 34 healthy adults, an L-Theanine-based drink significantly reduced subjective stress one hour after a cognitive stressor, and reduced the salivary cortisol response three hours post-dose, compared with placebo.
Human RCTFour weeks of 200 mg/day L-Theanine improved anxiety-trait and sleep-quality scores
In a randomised, placebo-controlled, double-blind crossover trial of 30 healthy adults, four weeks of 200 mg/day L-Theanine reduced Self-rating Depression Scale, State-Trait Anxiety Inventory-trait, and Pittsburgh Sleep Quality Index scores compared with placebo, alongside improvements in verbal fluency and executive function.
Human RCTA systematic review found 200-400 mg/day may help manage stress and anxiety
A systematic review of 9 human randomised controlled trials concluded that supplementation with 200-400 mg/day of L-Theanine may assist in reducing stress and anxiety in people exposed to stressful conditions, while noting that longer-term, larger studies are still needed.
Systematic reviewL-Theanine produced anxiolysis with less sedation than a benzodiazepine
In a randomized controlled trial of 168 preoperative surgical patients, oral L-Theanine and GABA produced effective anxiolysis with minimal sedation, while alprazolam produced significantly more sedation; psychomotor and cognitive performance improved with L-Theanine and GABA but decreased with alprazolam.
Human RCTTheanine and caffeine were shown to exert opposite effects on attention under stress
In a double-blind, repeated-measures trial of 36 adults exposed to emotionally arousing stimuli, caffeine accentuated global visual-attention processing while theanine accentuated local processing, and theanine mitigated the physiological stress response that caffeine tends to accentuate.
Human RCTCombining L-Theanine with caffeine lowered anxiety while preserving performance in elite athletes
In a double-blind, placebo-controlled crossover trial of 12 elite wrestlers, caffeine alone increased state anxiety, but a caffeine plus L-Theanine combination reduced anxiety incidence to below placebo levels (8% vs 33%) while still improving cognitive speed, accuracy and physical performance measures.
Human RCTA systematic review found L-Theanine reduced symptoms across several psychiatric conditions
A systematic review of 11 randomized controlled trials across six countries found L-Theanine supplementation, used adjunctively, reduced psychiatric symptoms more effectively than control conditions in individuals with schizophrenia, anxiety disorders, and ADHD.
Systematic reviewL-Theanine plus vitamin B6 reduced tics and anxiety in children with Tourette syndrome
In a pilot trial of 34 children with Tourette syndrome or chronic tic disorder and co-occurring anxiety symptoms, supplementation with L-Theanine and vitamin B6 was significantly more effective than psychoeducation alone at reducing tic severity, with reductions in anxiety symptoms also observed.
Human RCTAn older review situates L-Theanine among GABA-pathway supplements used for everyday anxiety
A review of dietary supplements used for relaxation and mild anxiolytic action - including GABA, theanine, tryptophan and 5-HTP - describes these as generally acting as GABA-receptor agonists or GABA-boosting agents, positioning them as alternatives for managing the stress and anxiety of everyday life.
ReviewA meta-analysis of 19 trials found L-Theanine significantly improved sleep quality
A systematic review and meta-analysis of 19 randomized controlled trials (897 participants) found L-Theanine significantly improved subjective sleep onset latency, subjective daytime dysfunction, and overall subjective sleep quality scores compared with placebo.
Meta-analysisA systematic review of 13 trials found 200-450 mg/day supports healthy sleep
A systematic review of 13 eligible trials (550 participants) found that supplementation with 200-450 mg/day of L-Theanine appears to be a safe and effective way to support sleep latency, maintenance and efficiency, and perceived sleep satisfaction in adults.
Systematic reviewA combined GABA and L-Theanine supplement improved total sleep-quality scores
In an exploratory single-arm study of 19 adults with sleep problems, four weeks of combined GABA (700 mg/day) and L-Theanine (200 mg/day) produced a significant improvement in the total Pittsburgh Sleep Quality Index score, alongside a small but significant reduction in heart rate during sleep.
Human studyAn honest 2025 review: the mechanism is plausible, but the strongest human evidence is still limited
A 2025 review of L-Theanine's chemistry and biology confirms it is well absorbed and crosses the blood-brain barrier, and that some studies link it to increased alpha brain waves associated with relaxation and selective attention - but the authors caution that rigorous human clinical trials remain limited and urge care in how strongly benefits are claimed.
ReviewA safety review found L-Theanine reliable even at higher dietary intakes
A review of L-Theanine's metabolism, health effects and safety concluded that results of acute and chronic toxicity testing indicate L-Theanine is generally reliable, even when consumed in excess of typical dietary amounts.
Safety reviewA brain-wave study found GABA increased alpha activity more than L-Theanine did
In a human EEG study comparing water, GABA, and L-Theanine intake, GABA significantly increased alpha waves and decreased beta waves compared with both water and L-Theanine after 60 minutes - an honest reminder that not every calming compound affects brain-wave activity to the same degree.
Human studyA systematic review found magnesium supplements generally improved anxiety and sleep
A systematic review of 15 interventional trials found the majority demonstrated improvement in at least one sleep- or anxiety-related outcome with supplemental magnesium, with minimal side effects reported, though the authors noted heterogeneity across studies and called for larger, better-designed trials.
Systematic reviewA review found magnesium reduced subjective anxiety in anxiety-vulnerable groups
A systematic review of 18 studies found evidence suggestive of a beneficial effect of magnesium supplementation on subjective anxiety in samples with an existing vulnerability to anxiety (mildly anxious, premenstrual, and hypertensive groups), while noting the overall evidence quality was poor and well-designed trials are still needed.
Systematic reviewA review linked magnesium status to depressive and anxiety symptoms across mental disorders
A systematic review of 32 articles on magnesium in mental disorders found that reduced plasma magnesium correlated with depressive symptoms in multiple studies, and that magnesium supplementation was associated with improved outcomes in some anxiety and depression studies, while calling for dedicated clinical trials to confirm efficacy.
Systematic review250 mg of magnesium bisglycinate modestly reduced insomnia severity in a placebo-controlled trial
In a randomized, double-blind, placebo-controlled trial of 155 adults reporting poor sleep, four weeks of 250 mg elemental magnesium as magnesium bisglycinate produced a significantly greater reduction in Insomnia Severity Index scores than placebo, with a modest effect size and larger benefits seen in those with lower baseline dietary magnesium intake.
Human RCTA human trial found chelated magnesium diglycinate better absorbed than magnesium oxide
In a double-blind, randomized crossover trial in patients with ileal resection, isotope-labelled magnesium diglycinate (chelate) showed substantially greater absorption than magnesium oxide in those with the most impaired magnesium absorption, and was better tolerated by all patients, supporting absorption in part as an intact dipeptide.
Human RCTAn animal study found organic magnesium compounds, including glycinate, absorbed better than inorganic forms
In a mouse study comparing organic acid-bound and amino-acid-bound magnesium compounds, organic magnesium compounds - including magnesium glycinate - showed better tissue absorption patterns than inorganic magnesium forms, though the authors note further research is needed on long-term human use.
Animal studyA magnesium plus L-Theanine (green tea) combination reduced chronic stress scores in a placebo-controlled trial
In a randomized, placebo-controlled trial of 100 chronically stressed adults, 28 days of a combination supplement containing magnesium, B vitamins, rhodiola and green tea/L-Theanine significantly reduced DASS-42 stress scores compared with placebo, with improvements in sleep-related daytime dysfunction also observed.
Human RCTA 2026 review positions a magnesium-L-Theanine complex as a multi-target relaxation strategy
A 2026 review of a novel magnesium-L-Theanine (MgT) complex summarizes converging human evidence for anxiolytic, antidepressant and sleep-promoting benefits from magnesium and L-Theanine supplementation, alongside preclinical findings on stress-related gut and metabolic pathways, supporting the translational rationale for combining the two ingredients.
ReviewA nutraceutical combination including L-Theanine and magnesium reduced OCD symptom severity in a pilot study
In a 20-week open-label pilot study of 28 people with treatment-resistant OCD, a combination of nutraceuticals including L-Theanine, magnesium, zinc and N-acetyl cysteine produced a significant reduction in Yale-Brown Obsessive-Compulsive Scale scores over time, with the authors noting the finding needs confirmation in a placebo-controlled trial.
Human studyFrequently asked questions
What is CanPrev L-Theanine with Magnesium and what does it do?
It's a Health Canada-licensed Natural Health Product combining 250 mg of L-Theanine (the amino acid naturally found in green and black tea) with 20 mg of magnesium bisglycinate in one vegetable capsule. Its authorized use is to help temporarily promote relaxation.
How do I take it?
Adults (19 years and older) take one (1) capsule per day, or as directed by a health care practitioner. One 90-capsule bottle is a 90-day supply at this dose.
Will it make me feel drowsy?
This formula is intended to support relaxation without the sedating effect associated with some calming ingredients. As with any supplement, individual responses vary - use caution with activities requiring mental alertness until you know how it affects you.
Why is magnesium bisglycinate included with the L-Theanine?
Magnesium bisglycinate is magnesium chelated to the amino acid glycine - a form studied for improved gastrointestinal tolerance and absorption compared to inorganic magnesium salts such as magnesium oxide.
Where does the L-Theanine come from?
The L-Theanine in this product is derived from green and black tea, the natural dietary source of this amino acid.
Who should not use it?
Consult a health care practitioner before use if you are pregnant or breastfeeding. Do not use if the safety seal is broken. Keep out of reach of children.
Is it vegan and allergen-friendly?
Yes - vegan, non-GMO, gluten-free, dairy-free, soy-free, sugar-free and corn-free, with no artificial colours, flavours or preservatives.
Is it made in Canada?
Yes. CanPrev L-Theanine with Magnesium is formulated in Canada and licensed by Health Canada as a Natural Health Product under NPN 80037616.
Add CanPrev L-Theanine with Magnesium to your daily routine
Get CanPrev L-Theanine with Magnesium on Amazon.ca - fast, protected delivery.
Get it on Amazon.caNatural Health Product NPN 80037616. Helps to temporarily promote relaxation. The research summaries below concern the individual ingredients in this formula generally and are educational - they are not claims about this finished product. Read and follow the label. Consult a health care practitioner before use if you are pregnant or breastfeeding. Do not use if the safety seal is broken. Results may vary.
Important information
Safety Information
Cautions and Warnings: Consult a health care practitioner prior to use if you are pregnant or breastfeeding. Hypersensitivity (e.g. allergy) has been known to occur; if it occurs, discontinue use. Some people may experience drowsiness; exercise caution if operating heavy machinery, driving a motor vehicle or engaging in activities requiring mental alertness. Do not use if the safety seal is broken. Keep out of reach of children. Store in a cool, dry place. Known Adverse Reactions: Some people may experience mild digestive upset (e.g. constipation) or, in rare cases, irritability or insomnia; if these occur, discontinue use.
Indications
Recommended Use or Purpose: Helps to temporarily promote relaxation.
Ingredients
Medicinal Ingredients (1 Capsule): L-Theanine (green and black tea) 250 mg; Magnesium (magnesium bisglycinate) 20 mg. Non-medicinal Ingredients: Hypromellose (vegetable capsule), magnesium stearate. Vegan, non-GMO, gluten-free, dairy-free, soy-free, sugar-free, corn-free; no artificial colours, flavours or preservatives.
Directions
Recommended Dose (Adults 19 years and older): Take 1 vegetable capsule per day, or as directed by a health care practitioner.
Legal Disclaimer
Actual product packaging and materials may contain more and different information than shown on our website. Always read labels, warnings and directions before using or consuming a product. Formulated in Canada by CanPrev Natural Health Products Ltd. This item is sold and shipped by Amazon.ca; purchases are completed on Amazon.