ProHealth health Vitamin and Natural Supplement Store and Health
Home  |  Log In  |  My Account  |  View Cart  View Your ProHealth Vitamin and Supplement Shopping Cart
800-366-6056  |  Contact Us  |  Help

|
|
|
|

Trending News

Guarding Against the Dangers of Vitamin D Deficiency

Omega-3 fatty acids, vitamin D may control brain serotonin, affecting behavior and psychiatric disor...

Fatigue & Fibro Fog: Could You Have a B-12 Deficiency?

How Glutathione Can Save Your Life

New Dietary Guidelines Reverse Flawed Recommendations on Cholesterol

Long term antibiotic therapy may be an effective treatment for children co-morbid with Lyme disease ...

Anticancer Properties Of Saffron

Beyond Depression... SAMe Broad-Spectrum Protection Against Disorders Of Aging

BPA exposure linked to autism spectrum disorder, study reports

Omega-3 Fatty Acids Appear to Protect Damaged Heart After Heart Attack

 
Print Page
Email Article

L-theanine by the cup (green tea) or the capsule, no difference found

  [ 3 votes ]   [ Discuss This Article ]
www.ProHealth.com • December 7, 2012


Article:
Kinetics of L-Theanine Uptake and Metabolism in Healthy Participants Are Comparable after Ingestion of L-Theanine via Capsules and Green Tea
-    Source: The Journal of Nutrition, Dec 1, 2012

By Lisa Scheid, Sabine Ellinger, et al.,

[Note: Green tea is a rich source of a family of antioxidants called catechins. One dominant catechin virtually unique to green tea (and mushrooms) is the amino acid called L-theanine. Another well-known catechin unique to green tea is epigallocatechin-3-gallate (EGCG).]

Abstract:
L-Theanine, an amino acid in green tea, is suggested to improve cognition and mood. Therefore, L-theanine is available as a supplement and is now used as an ingredient in functional drinks.

Because data on the metabolic fate of L-theanine from human studies are lacking, we investigated the kinetics of L-theanine uptake and its metabolites [substances produced in the metabolic breakdown of L-theanine], ethylamine and glutamic acid, in healthy participants.

Within a randomized crossover study, 12 participants ingested a bolus of 100 mg L-theanine via capsules or green tea. On further occasions, 3 participants received 50 and 200 mg L-theanine via capsules.

Blood and urine were collected before and up to 24 hours post consumption to determine the concentrations of L-theanine, proteinogenic amino acids, and ethylamine in plasma, erythrocytes, and urine by HPLC.

L-theanine increased in plasma, erythrocytes, and urine with comparable results after both treatments. The maximum plasma concentration of L-theanine occurred 0.8 hours after intake of 100 mg L-theanine via capsules (24.3 +/- 5.7 ?mol/L) and tea (26.5 +/- 5.2 ?mol/L), respectively. The AUC of L-theanine in plasma increased dose dependently after intake of 50, 100, and 200 mg L-theanine via capsules.

Moreover, ethylamine and glutamic acid increased in plasma and were excreted by urine after intake of capsules and tea.

In conclusion, L-theanine is rapidly absorbed and seems to be hydrolyzed [broken down] to ethylamine and glutamic acid.

A minor part of L-theanine is retained in erythrocytes. Kinetics and urinary excretion of L-theanine, ethylamine, and glutamic acid are comparable after both treatments.

Thus, functional effects of L-theanine intake may result from L-theanine, ethylamine, or glutamic acid.

Source: The Journal of Nutrition, Dec 1, 2012. DOI: 10.3945/jn.112.166371, by Scheid L, Ellinger S, Alteheld B, Herholz H, Ellinger J, Henn T, Helfrich HP, Stehle P. Department of Nutrition and Food Science-Nutritional Physiology, and Institute for Numerical Simulation, University of Bonn; Department of Surgery and Department of Urology and Children Urology, University Hospital Bonn; TeeGschwendner, Meckenheim, Germany . [E-mail: ellinger@uni-bonn.de]

 




Please Discuss This Article:   Post a Comment 



[ Be the first to comment on this article ]




 
Free Chronic Fatigue Syndrome and Fibromyalgia Newsletters
Subscribe to
Our FREE
Newsletter
Subscribe Now!
Receive up-to-date ME/CFS & Fibromyalgia treatment and research news
 Privacy Guaranteed  |  View Archives

Save on Vitamins and Supplements

Featured Products

Vitamin D3 Extreme™ by ProHealth Vitamin D3 Extreme™ by ProHealth
50,000 IU Vitamin D3 - Prescription Strength
Ultra EPA  - Fish Oil Ultra EPA - Fish Oil
Ultra concentrated source of essential fish oils
Ultra ATP+, Double Strength Ultra ATP+, Double Strength
Get energized with malic acid & magnesium
Optimized Curcumin Longvida® by ProHealth Optimized Curcumin Longvida® by ProHealth
Supports Cognition, Memory & Overall Health
Energy NADH™ 12.5mg Energy NADH™ 12.5mg
Improve Energy & Cognitive Function

Natural Remedies

Dreaming of a Good Night's Sleep? Dreaming of a Good Night's Sleep?
Carry a Massage Therapist in Your Pocket Carry a Massage Therapist in Your Pocket
When a Negative is Positive - Goodnighties Recovery Sleepwear When a Negative is Positive - Goodnighties Recovery Sleepwear
Reversing Neurodegeneration with a New Magnesium Compound Reversing Neurodegeneration with a New Magnesium Compound
Everything You Always Wanted to Know About Sleep But Were Too Tired to Ask Everything You Always Wanted to Know About Sleep But Were Too Tired to Ask

FIBROMYALGIA RESOURCES
What is Fibromyalgia?
Fibromyalgia Diagnosis
Fibromyalgia Symptoms
Fibromyalgia Treatments
| CFS RESOURCES
What is CFS?
ME/CFS Diagnosis
ME/CFS Symptoms
ME/CFS Treatments
| FORUMS
Fibromyalgia
ME/CFS
ADVANCED MEDICAL LABS
WHOLESALE  |  AFFILIATES
GUARANTEE  |  PRIVACY
CONTACT US
LIBRARY
RSS
SITE MAP
ProHealth on Facebook  ProHealth on Twitter  ProHealth on Pinterest  ProHealth on Google Plus
Credit Card Processing