Green Tea, Caffeine & L-Theanine (swedeboy)

Discussion in 'Fibromyalgia Main Forum' started by Slayadragon, Mar 23, 2007.

  1. Slayadragon

    Slayadragon New Member

    You asked me a question about the caffeine in green tea on aelf's methyl supplements thread, but I thought it should get its own.

    I could be wrong, but I don't think that the caffeine in green tea is a big issue for me. Part may be that green tea doesn't have a lot of caffeine to begin with. The other thing could be that other substances in the tea (such as l-theanine) help to balance it out.

    Coffee generally makes me feel quite bad, though.

    Perhaps I will start to keep track of which days I do vs. don't drink tea and see if it affects my sleep. That might be a good indication of whether it's causing my adrenals to work harder to excrete hormones and thus causing adrenal stress.

    My adrenals are better than they used to be, but it's still important to keep an eye on them. The Famvir has been tough on them.

    Best, Lisa


    12-ounce beverage milligrams
    Red Bull (8.2 oz) 80.0
    Jolt 71.2
    Pepsi One 55.5
    Mountain Dew 55.0
    Mountain Dew Code Red 55.0
    Diet Mountain Dew 55.0
    Kick Citrus 54.0
    Mellow Yellow 52.8
    Surge 51.0
    Tab 46.8
    Diet Coke 45.6
    Shasta Cola 44.4
    Shasta Cherry Cola 44.4
    Shasta Diet Cola 44.4
    RC Cola 43.0
    Diet RC 43.0
    Dr. Pepper 41.0
    Diet Dr. Pepper 41.0
    Diet Sunkist Orange 41.0
    Mr. Pibb 40.0
    Sugar-Free Mr. Pibb 40.0
    Red Flash 40.0
    Sunkist Orange 40.0
    Slim-Fast Cappuccino Delight Shake 40.0
    Ruby Red 39.0
    Storm 38.0
    Big Red 38.0
    Pepsi-Cola 37.5
    Pepsi Twist 37.5
    Diet Pepsi Jazz 37.5
    Diet Pepsi 36.0
    Wild Cherry Pepsi 38.0
    Diet Wild Cherry Pepsi 36.0
    Diet Pepsi Twist 36.0
    Aspen 36.0
    Coca-Cola Classic 34.0
    Cherry Coke 34.0
    Lemon Coke 34.0
    Vanilla Coke 34.0
    Diet Cherry Coke 34.0
    Snapple Flavored Teas (Reg. or Diet) 31.5
    Canada Dry Cola 30.0
    A&W Creme Soda 29.0
    Nestea Sweet Iced Tea 26.5
    Nestea Unsweetened Iced Tea 26.0
    Barq's Root Beer 23.0
    A&W Diet Creme Soda 22.0
    Slim-Fast Chocolate Flavors 20.0
    Snapple Sweet Tea 12.0
    Lipton Brisk, All Varieties 9
    Canada Dry Diet Cola 1.2
    Diet Rite Cola 0
    Sprite 0
    7-Up 0
    Mug Root Beer 0
    Diet Barq's Root Beer 0
    Sundrop Orange 0
    Minute Maid Orange 0
    A&W Root Beer 0
    Slice 0
    Sierra Mist 0
    Fresca 0

    Other Beverages

    8-ounce Beverage milligrams
    Coffee, Drip 115-175
    Coffee, Brewed 80-135
    Coffee, Espresso (2 ounces) 100
    Coffee, Instant 65-100
    Tea, iced 47
    Tea, brewed, imported brands (avg.) 60
    Tea, brewed, U.S. brands (avg.) 40
    Tea, instant 30
    Tea, green 15
    Hot cocoa 14
    Coffee, Decaf, brewed 3-4
    Coffee, Decaf, instant 2-3
    [This Message was Edited on 03/24/2007]
  2. roge

    roge Member

    Does anyone kwow approx how much L-T there is in a cup of green tea or i suppose it might vary depending on the manufacturer. My box doesnt state, it does state 20mg of caffeine so not that much although again maybe different for different manufacturers.

    Read somewhere in japan, L- Theanine is so big there it is put in gum and other products and is a regular staple for them.

    What actually is L- Theanine though? I know it is a non protein amino acid but it isnt a herb right? and it isnt a food supplement as I dont believe it is found in any foods? Is it only found in green tea leaves and if so I gather it is just a natural compound then?

  3. roge

    roge Member

    ok i think it is a herb actually. yes green tea is a herb - dah - it is a plant - sorry - just waking up here
  4. Slayadragon

    Slayadragon New Member

    From the Pure Encapsulations Web site:

    Promotes relaxation; helps to moderate occasional stress
    *Green tea has been recognized for centuries as having relaxant properties. l-Theanine, a unique amino acid derived from tea, provides the characteristic taste of green tea. l- Theanine has also been discovered as the biologically active constituent of green tea responsible for promoting relaxation. In a preliminary non-clinical study, an l-theanine solution enhanced alpha wave production in the occipital and parietal regions of the brains of volunteers. These observed patterns are considered to be an index of relaxation. Furthermore, it did so rapidly and without causing drowsiness. In two additional studies, alpha waves were also shown to be detectable soon after l-theanine administration. Theanine is also useful for supporting healthy cellular function. Preliminary research suggests that l-theanine may be helpful for premenstrual support including healthy attitude. Furthermore, theanine has been reported to moderate the effects of caffeine on the central nervous system. l-Theanine's safety is supported in studies and by its long history of safe consumption in tea. Pure Encapsulations l-Theanine is Suntheanine®, the brand which has been used in scientific studies.

    Pure Encapsulations offers Suntheanine® l-Theanine, a unique amino acid, providing helpful relaxation support without causing drowsiness and easing occasional nervous tension and irritability.
  5. Slayadragon

    Slayadragon New Member

    As sleep remedies go, this has been one of my most successful. It's so gentle that I don't remember that it's helping, unless I forget it for a night or two.

    I take 800 mg of the Pure Encapsulations product before bedtime. (The suggested dose is between 200 and 1200 mg.)

    I've become more actively interested in green tea too. There is a cool shop in Chinatown in San Francisco that also sells on the Internet. They have something like 15 different green teas (plus a whole lot of white, oolong, herb and black teas), and you can order 1 ounce at a time to see which ones you like best. The company name is redblossomtea in the event anyone is interested.

    Best, Lisa
  6. swedeboy

    swedeboy Member

    Thanks for the all the info. I didn't realize that green tea doesn't really have that much caffine in it. Jasmine Green tea is one of all time favorite drinks.

    I have heard that even in organic green tea that certain potentially harmful substances are used in the processing of the tea. Has anyone else heard this? My sister told me about this, but I couldn't find any info to back this claim up.

    Lisa, When you say "I take 800 mg of the Pure Encapsulations product before bedtime." Is that L-theanine or green tea extract?

    Thanks again, Swedeboy
  7. happycanuk

    happycanuk New Member

    I drink green tea everyday as well, only decaf. I buy it from It is the only thing that I do consistently and the pain I have had is much less and of course, it is loaded with antioxidants. It does have Stevia and Lo-Han, Licorice root in it as well. The Raspberry is one of my favorites.
  8. roge

    roge Member

    I drink jasmine green tea too swedeboy! still trying to find out approx how much L-theanine is in 1 cup - I think I might have read 100-150mg , but that seems high to me.

    Upon further research it appears L - Theanine has many benefits including strengthening the immune system.

    New Study Shows Tea (L-Theanine) Boosts the Body's Defenses

    A new study finds that tea boosts the body's defenses against infection and contains a substance that might be turned into a drug to protect against disease, researchers say. Coffee does not have the same effect, they say. A component in tea was found in laboratory experiments to prime the immune system to attack invading bacteria, viruses and fungi, according to a study in the Proceedings of the National Academy of Sciences released Monday.

    A second experiment, using human volunteers, showed that immune system blood cells from tea drinkers responded five times faster to germs than did the blood cells of coffee drinkers.

    "We worked out the molecular aspects of this tea component in the test tube and then tested it on a small number of people to see if it actually worked in human beings," said Dr. Jack F. Bukowski, a researcher at Brigham and Women's Hospital in Boston and Harvard Medical School. The results, he said, gave clear proof that five cups of tea a day sharpened the body's disease defenses.

    Penny Kris-Etherton, a nutrition specialist at Penn State University, a nutrition expert, said Bukowski's study adds to a growing body of evidence that tea is an effective disease fighter.

    "This is potentially a very significant finding," she said. "We're seeing multiple benefits from tea."

    But she said the work needs to be confirmed in a much larger study, involving more people.

    In the study, Bukowski and his co-authors isolated from ordinary black tea a substance called L-theanine.

    Bukowski said L-theanine is broken down in the liver to ethylamine, a molecule that primes the response of an immune system element called the gamma-delta T cell.

    "We know from other studies that these gamma-delta T cells in the blood are the first line of defense against many types of bacteria, viral, fungal and parasitic infections," he said. "They even have some anti-tumor activity."

    The T cells prompt the secretion of interferon, a key part of the body's chemical defense against infection, Bukowski said.

    "We know from mouse studies that if you boost this part of the immune system it can protect against infection," he said.

    To further test the finding, the researchers had 11 volunteers drink five cups a day of tea, and 10 others drink coffee. Before the test began, they drew blood samples from all 21 test subjects.

    After four weeks, they took more blood from the tea drinkers and then exposed that blood to the bacteria called E-coli. Bukowski said the immune cells in the specimens secreted five times more interferon than did blood cells from the same subjects before the weeks of tea drinking. Blood tests and bacteria challenges showed there was no change in the interferon levels of the coffee drinkers, he said.

    Bukowski said it may be possible to further isolate and refine L-theanine from tea and use that as a drug to boost the infection defense of the body.

    The health effects of tea have been extensively studied. It has been linked to lower heart disease and cancer risk through the action of flavonoids, a type of antioxidant. Other studies have linked tea to helping combat osteoporosis, the brittle bone disease, and to relieving some allergy symptoms.

    Proceedings of the National Academy of Sciences:

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