Activate Now
 
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

Acupuncture used in clinical settings reduced symptoms of menopause

Benefits of Coconut Oil Are Undeniable

How Awesome Is Ashwagandha?

CoQ10 supplementation associated with lower pro-inflammatory factors in randomized trial

SURVEY RESULTS: Should Opioids Be Restricted for Chronic Illness?

Clinical trial demonstrates success of low FODMAP diet

Research Demonstrates Superiority of Krill Oil Compared to Fish Oil

What’s so Remarkable About Rosemary?

Vitamin nicotinamide riboside protects mice from diabetes complications

Turmeric: The Spice of Life

 
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® Vitamin D3 Extreme™ Energy NADH™ 12.5mg

Looking for Vitamins, Herbs and Supplements?
Search the ProHealth Store for Hundreds of Natural Health Products


Article Comments



Be the first to comment on this article!

Post a Comment


 
All Natural Deodorants

Featured Products

Mitochondria Ignite™ with NT Factor® Mitochondria Ignite™ with NT Factor®
Reduce Fatigue up to 45%
Ultra ATP+, Double Strength Ultra ATP+, Double Strength
Get energized with malic acid & magnesium
Energy NADH™ 12.5mg Energy NADH™ 12.5mg
Improve Energy & Cognitive Function
Ultra EPA  - Fish Oil Ultra EPA - Fish Oil
Ultra concentrated source of essential fish oils
Vitamin D3 Extreme™ Vitamin D3 Extreme™
50,000 IU Vitamin D3 - Prescription Strength

Natural Remedies

Carry a Massage Therapist in Your Pocket Carry a Massage Therapist in Your Pocket
Enhance Eyelashes Naturally Enhance Eyelashes Naturally
How I Found My Long-Lost Energy How I Found My Long-Lost Energy
Itching to Find Dry Skin Relief? Itching to Find Dry Skin Relief?
Vitamin E: Super Antioxidant We Only Thought We Knew Vitamin E: Super Antioxidant We Only Thought We Knew

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 AND SAVE 15% NOW*
Be the first to know about new products, special discounts and the latest health news. *New subscribers only

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

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