Key Takeaways
Clinical Dose Formula
Contains 200mg L-theanine per daily serving, the exact amount used in research studies showing improved sleep quality and reduced morning fatigue.
Simple Daily Routine
Take 4 easy-to-swallow tablets with water before bedtime. No complicated timing or food requirements needed.
Quality Assured
Manufactured by Asahi Group Foods, one of Japan's largest food and beverage companies with strict quality standards.
Research-Backed Benefits
L-theanine has been shown to reduce fatigue upon waking (P<0.0001) and decrease morning drowsiness (P=0.005) in clinical studies.
Best For
Those experiencing difficulty winding down, waking up tired despite adequate sleep hours, or seeking natural support for sleep quality.
Trusted in Japan
Over 2 million units sold since launching in 2016. Nenite is a leading sleep supplement brand addressing Japan's sleep challenges.
Is This Right For You?
Recommended For
Nenite is designed for those seeking natural L-theanine and sleep support to improve sleep quality and wake up feeling more refreshed.
If you're waking up feeling tired and unrefreshed despite getting enough hours of sleep each night.
If you've been searching for the right dose of L-theanine for sleep and want a clinically researched amount.
If you're a busy professional who struggles to wind down and relax at the end of a demanding workday.
If you're looking for a theanine supplement that's backed by published research and made by a trusted brand.
If you want to support your body's natural relaxation processes without relying on melatonin or sleep medications.
If you've tried other sleep supplements but haven't found one that helps you wake up feeling genuinely refreshed.
If you're interested in taking L-theanine before bed as part of a calming nighttime routine.
If you value Japanese quality and want a Functional Food certified supplement with transparent ingredient disclosure.
Why It Works
Benefits
Nenite delivers targeted support through L-theanine, an amino acid naturally found in green tea.
Reduces Morning Fatigue
Wake up feeling more restored. Clinical studies show that 200mg of L-theanine taken daily for 6 days significantly reduced feelings of fatigue upon waking (P<0.0001). L-theanine supports deeper, more restorative sleep without causing grogginess or dependency.
Clinically ValidatedDecreases Morning Drowsiness
Say goodbye to that heavy, drowsy feeling in the morning. Research demonstrates that L-theanine supplementation reduces the sensation of sleepiness upon waking (P=0.005), helping you start your day more alert and ready.
Research-Backed IngredientImproves Overall Sleep Quality
L-theanine is known to promote relaxation without sedation by supporting alpha brain wave activity. This helps you transition into sleep more naturally and experience better quality rest throughout the night.
Functional Food CertifiedSupports Relaxation Before Bed
Taking L-theanine before bed helps calm the mind and prepare the body for rest. Unlike stimulant-blocking sleep aids, L-theanine works with your body's natural processes to promote a sense of calm and ease.
Natural Amino AcidThe Science
How It Works
Understanding how L-theanine supports your body's natural sleep processes.
L-Theanine and Alpha Brain Waves
When consumed, L-theanine crosses the blood-brain barrier and promotes the production of alpha brain waves, which are associated with a state of wakeful relaxation.
This calming effect helps reduce stress and anxiety, making it easier to transition into restful sleep without causing drowsiness during the day.
Clinical Research on Sleep Quality
The L-theanine group showed significant improvements in both:
- Fatigue reduction upon waking (P<0.0001)
- Reduced drowsiness upon waking (P=0.005)
The Science
Research & Evidence
What clinical research tells us about L-theanine and sleep quality.
Clinical Study: Sleep Quality Improvement—A study published in the Japanese Journal of Physiological Anthropology examined the effects of 200mg L-theanine supplementation on sleep quality. After 6 days, participants showed statistically significant improvements in fatigue upon waking (P<0.0001) and drowsiness upon waking (P=0.005).
A Note on Evidence: We present research on ingredients, not specific product claims. Individual results may vary. This supplement is not intended to diagnose, treat, cure, or prevent any disease.
Ingredient Research Highlights
L-THEANINE
L-theanine is a non-protein amino acid found naturally in tea leaves (Camellia sinensis). It is known for its ability to promote relaxation without sedation. Research suggests L-theanine may support alpha brain wave activity, which is associated with a calm, alert mental state.
Published research in nutritional and physiological journalsCONSUMER VALIDATION
Over 2 million units sold since 2016. Nenite was created by Asahi Group Foods to address Japan's sleep deficit challenge. Japan has been identified by the OECD as having the lowest average sleep time among developed nations.
Asahi Group Foods official product informationThe Story
About Brand Story
Asahi Group Foods, Ltd.
We manufacture primarily in domestic ISO-certified factories under a strict integrated production system. From sourcing raw materials to final packaging, Asahi guarantees purity and consistency, delivering daily health solutions you can trust implicitly.
Our Curation Process
Why We Selected This Product
Every product at Naturacare undergoes rigorous evaluation before joining our collection.
信頼性
Reliability
Backed by Asahi Group Foods, one of Japan's most established food and beverage companies. With over 2 million units sold, Nenite has earned the trust of Japanese consumers seeking sleep support.
科学性
Scientific Foundation
Uses the exact 200mg L-theanine dose validated in published clinical research. The product holds Functional Food certification, requiring evidence-based health claims.
誠実
Authenticity
Created to address a real social issue - Japan's chronic sleep deficit. The thoughtful brand name reflects genuine care for helping people achieve better rest and better tomorrows.
Our Promise: We don't just import popular Japanese supplements - we investigate each product's formulation, manufacturing standards, and real-world reputation in Japan.
Nenite represents Japanese supplement innovation at its finest: research-backed ingredients, transparent formulation, and a genuine mission to improve daily life through better sleep.
Why Japan
The Japanese Advantage
Japan's supplement industry operates under some of the world's strictest quality standards. Combined with a cultural dedication to craftsmanship and centuries of wellness traditions, Japanese supplements represent a level of quality that's difficult to find elsewhere.
Rigorous Quality Standards
Japanese regulations require comprehensive testing at every stage of production, with standards that often exceed international requirements.
GMP-Certified Manufacturing
All our products come from facilities that meet Japan's strict GMP (Good Manufacturing Practice) certification requirements.
Centuries of Tradition
Many Japanese supplements draw on ingredients and formulations refined over generations, combining ancient wisdom with modern science.
Transparent Sourcing
Japanese manufacturers maintain complete traceability, so you know exactly where every ingredient comes from.
Directions
How to Use
Simple daily routine for optimal sleep support.
We recommend taking them before bedtime for best results.
Swallow tablets whole; do not chew.
Tips for Best Results
- Take consistently at the same time each night to establish a routine
- Take tablets 30-60 minutes before your intended bedtime
- Store in a cool, dry place away from direct sunlight
- Allow 1-2 weeks of consistent use to notice improvements
- Stay hydrated throughout the day to support overall wellness
- Combine with good sleep hygiene: consistent bedtime, dark room, limited screens
What's Inside
Ingredients
Clean, simple formulation focused on delivering effective L-theanine.
L-Theanine
Functional ingredient for sleep quality - the exact dose used in clinical research studies
Ingredients: Reduced maltose syrup (manufactured in Japan), Starch, Crystalline cellulose, L-Theanine, Calcium stearate, Silicon dioxide, Thickener (Guar gum)
Allergen Information: Contains: None of the major allergens. Free From: Eggs, milk, wheat, shellfish, fish, peanuts, tree nuts, soy.
Important Information
Safety & Precautions
Please read before use.
Dosage
Follow the recommended daily intake of 4 tablets. Do not exceed the recommended amount.
Medications
If you are taking hypertension medication or stimulants, avoid taking this product. Consult your healthcare provider before use if you take any prescription medications.
Pregnancy & Nursing
This product was not developed for pregnant women (including those planning pregnancy) or nursing mothers. Consult your healthcare provider before use.
Children
Keep out of reach of children. This product is intended for adults.
Medical Conditions
If you have a medical condition or are under medical treatment, consult your physician before taking this supplement.
Discontinue Use
If you experience any adverse effects, discontinue use immediately and consult a healthcare professional.
Disclaimer
This is a Functional Food, not a medicine. It is based on the business operator's responsibility and has been notified to the Consumer Affairs Agency.
Storage
Store in a cool, dry place away from direct sunlight and high humidity. Consume before the expiration date printed on the package.
Details
Product Specifications
Questions
Frequently Asked Questions
Nenite contains this exact research-validated dose of L-theanine per daily serving.
Taking this amount consistently for at least 6 days showed measurable improvements in study participants.
Unlike sleep medications, L-theanine works naturally - it helps your mind unwind and transition into restful sleep while supporting better quality rest throughout the night.
This is why taking L-theanine before bed is recommended rather than during the day for sleep purposes.
For best results, take Nenite consistently as part of your nightly routine and allow time for the cumulative benefits to develop.
Nenite focuses on theanine supplement benefits specifically for sleep quality, reducing morning fatigue and drowsiness.
Always consult your healthcare provider before combining supplements, especially if you take prescription medications.
With over 2 million units sold in Japan, it's one of the most trusted sleep supplements in a country known for rigorous quality standards.
Taking it consistently at the same time each night helps establish a calming bedtime routine.
However, those on hypertension medication or stimulants should avoid this product. If you experience any adverse effects, discontinue use.