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
Facebook Google Plus
Fibromyalgia  Chronic Fatigue Syndrome & M.E.  Lyme Disease  Natural Wellness  Supplement News  Forums  Our Story
Store     Brands   |   A-Z Index   |   Best Sellers   |   New Products   |   Deals & Specials   |   Under $10   |   SmartSavings Club

Trending News

Fighting Heartburn and Gerd Naturally – And Safely!

Natural Bladder Control, Go Less and Live More

Vital Molecule Increases Cellular Energy and Improves Cognitive Function

Top Vitamin and Mineral Deficiencies — Are You at Risk?

Trimming the spare tire: Canola oil may cut belly fat

How Pomegranate May Protect Against Cancer

Omega Fix for Obesity: How the Right Fats Fight Fat

The Onion: Cancer Fighter and Food Preserver

Probiotics improve cognition in Alzheimer's patients

Curcumin Reverses the Cellular Damage of Chronic Stress

 
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]

 





Post a Comment

Featured Products From the ProHealth Store
Optimized Curcumin Longvida® Energy NADH™ 12.5mg Ultra ATP+, Double Strength


Article Comments



Be the first to comment on this article!

Post a Comment


 
Natural Pain Relief Supplements

Featured Products

Ultra EPA  - Fish Oil Ultra EPA - Fish Oil
Ultra concentrated source of essential fish oils
FibroSleep™ FibroSleep™
The All-in-One Natural Sleep Aid
Vitamin D3 Extreme™ Vitamin D3 Extreme™
50,000 IU Vitamin D3 - Prescription Strength
Optimized Curcumin Longvida® Optimized Curcumin Longvida®
Supports Cognition, Memory & Overall Health
Ultra ATP+, Double Strength Ultra ATP+, Double Strength
Get energized with malic acid & magnesium

Natural Remedies

The Fast-Acting Solution for Healthy Digestive Function The Fast-Acting Solution for Healthy Digestive Function
Breaking Through the Mental Fog Breaking Through the Mental Fog
IBS, Crohn’s Disease, Colitis, and Other Digestive Disorders IBS, Crohn’s Disease, Colitis, and Other Digestive Disorders
The Guaifenesin Story: A centuries-old bark extract used for clearing the airways – now key to a popular FM symptom-reversal protocol The Guaifenesin Story: A centuries-old bark extract used for clearing the airways – now key to a popular FM symptom-reversal protocol
More Weight Loss than Any Other Discovery in Supplement History More Weight Loss than Any Other Discovery in Supplement History

CONTACT US
ProHealth, Inc.
555 Maple Ave
Carpinteria, CA 93013
(800) 366-6056  |  Email

· Become a Wholesaler
· Vendor Inquiries
· Affiliate Program
SHOP WITH CONFIDENCE
Credit Card Processing
SUBSCRIBE TO OUR NEWSLETTERS
Get the latest news about Fibromyalgia, M.E/Chronic Fatigue Syndrome, Lyme Disease and Natural Wellness

CONNECT WITH US ProHealth on Facebook  ProHealth on Twitter  ProHealth on Pinterest  ProHealth on Google Plus

© 2016 ProHealth, Inc. All rights reserved. Pain Tracker App  |  Store  |  Customer Service  |  Guarantee  |  Privacy  |  Contact Us  |  Library  |  RSS  |  Site Map