Doctor King & Company | Best Quality Organic Japanese Matcha Green Tea

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Doctor King & Company | Best Quality Organic Japanese Matcha Green Tea

Welcome to Doctor King & Company Ltd, Covent Garden, London.





If you are looking to buy authentic BEST QUALITY MATCHA at a REASONABLE PRICE, you've come to the right place. Dr. King MB ChB BSc (Hons.) explains why Doctor King® SUPREME CEREMONIAL GRADE ORGANIC JAPANESE MATCHA green tea is the WORLD'S HEALTHIEST TEA:

  • Organic Japanese Matcha is an excellent SUPERFOOD, which is very HEALTHY. It has a high density of antioxidants. *Research by experienced Food Chemists at the University of Colorado, USA, showed that one cup of Japanese matcha green tea made with one gram of Japanese matcha contains a phenomenal 137 TIMES the EGCG (epigallocatechin-3-gallate) ANTIOXIDANTS of one cup of green tea made with a teabag of Starbucks China Green Tips green tea (Weiss et al., 2003). EGCG is the most powerful antioxidant in tea. EGCG has 100 times the antioxidant power of Vitamin C (Mitscher et al., 1997). Antioxidants are very important in PROTECTING cells, DNA and other molecules in your body from damage by free radicals. Free radicals are a cause of many diseases (e.g. stroke, heart disease - and subsequent heart attacks - and injurious malignant tumours i.e. cancer). Matcha green tea also contains far more antioxidants than regular white tea and regular black tea. White tea is partially oxidised green tea. Black tea is fully oxidised green tea. Oxidation is the process involving enzymes and oxygen that results in yellowing/browning of green tea leaves. Research has shown that oxidation significantly reduces the amount of EGCG antioxidants in tea. Therefore, Japanese matcha green tea is the best of all teas in terms of the important healthy protective antioxidants. That is one big reason why we recommend Japanese matcha. Other reasons are explained below.
  • Doctor King® SUPREME Ceremonial Grade Organic Japanese Matcha Green Tea is 100% Ceremonial GRADE AAA matcha, which is the SUPREME quality. It is the KING OF GREEN TEAS. It could well be the world's finest green tea. Research has shown that Ceremonial Grade AAA matcha picked in the first harvest contains more chlorophyll and L-theanine than any other grade of matcha (e.g. Ceremonial Grade A, Ceremonial Grade B, mid-grade or culinary grade matcha) and any other tea. Chlorophyll is important for natural and effective detoxification ("detox"). L-theanine is a special amino acid that has gentle positive effects on the body: it gently increases concentration, calms the mind and relaxes the body without causing anxiety, palpitations, headache, jitters, caffeine spike and crash, and sleep disturbance, which are negative effects that have been reported by some regular coffee-drinkers. So, if you have not done so already, why not try replacing one cup of coffee with one cup of matcha green tea every day?
  • Our matcha is certified ORGANIC by Soil Association, Japan Organic & Natural Foods Association (JONA) and the United States Department of Agriculture (USDA). Organic plants are carefully grown without using harmful chemicals (e.g. pesticides and chemical fertilizers). That's one reason why we recommend organic. Other reasons are explained below.
  • We sell only JAPANESE matcha. We advocate Japanese matcha because good American research showed that Chinese matcha frequently contains high levels of lead. This is discussed in more detail below.
  • Unlike some other brands, Doctor King® matcha has actually been LABORATORY-TESTED at Eurofins laboratories (Berlin, Germany) and Shin Nihon Kentei Kyokai laboratory in Japan. The results showed that pesticides are not present in Doctor King® matcha. Also, lead and radiation were "not detected" in Doctor King® matcha.
  • Unlike some other brands, our matcha is FRESHLY MADE in Japan in small batches every month or so and is foil-packed for extra freshness. The matcha is transported from Japan to the United Kingdom and to the United States of America by EXPRESS AIR FREIGHT (not slow sea freight) to ensure that the matcha that reaches our customers is fresher. The fresher the matcha the better.
  • Organic Japanese Matcha is RECOMMENDED by Doctors and Nutritionists.
  • Our products are RECOMMENDED by customers.
  • The products are dispatched from centres all over the world to ensure fast delivery to our customers.






Q: Why should you consider consuming EGCG (or EpiGalloCatechin-3-Gallate - the most powerful antioxidant in tea) in SUPREME Ceremonial Grade Organic Japanese Matcha Green Tea each and every day?

A: EGCG helps prevent cancer. Organic Japanese Matcha Green Tea is one of the purest, most natural and healthiest ways of boosting your EGCG intake. One gram of Organic Japanese Matcha has 137 times the EGCG of regular green tea (Starbucks China Green Tips Green Tea). Also, one gram of Organic Japanese Matcha has the same antioxidant power as 136 grams of raw spinach! Organic Japanese Matcha is one of the world's top health secrets!

Q: How does EGCG (EpiGalloCatechin-3-Gallate - the most powerful antioxidant in tea) help prevent cancer? 

A: EGCG inhibits the initiation and growth of many different types of cancer by various mechanisms e.g.

  1. EGCG is important in preventing free radicals damaging DNA which may lead to mutation (change) in genes. Mutation of genes, which doctors call  "protooncogenes" and "tumour suppressor genes", are very important steps in initiation of cancer. Protooncogenes are normal genes. Some protooncogenes control the speed of cell division. If these protooncogenes are damaged and mutated by free radicals, the speed of cell division may become uncontrolled (very fast) causing cancer! Hence, EGCG (which fights free radicals) is important in stopping cancer initiation and growth!
  2. Also, EGCG inhibits enzymes involved in cancer cell replication and DNA synthesis in cancer cells and therefore EGCG helps stop cancer growth;
  3. EGCG inhibits enzymes involved in spread of cancer and therefore helps stop cancer spreading;
  4. EGCG inhibits cancer angiogenesis and therefore helps stop cancer growth. Further research is ongoing. References are available on request.


Recent research led by Professor Michael Lisanti of the University of Salford published in the journal Aging confirms what Dr. King has believed for a very long time:

Photograph of Professor Michael Lisanti, University of Salford

Professor of Cancer Biology, Breakthrough Breast Cancer Unit, University of Manchester, UK


"I have been an active research scientist for over 30 years.

I began my education at New York University, graduating Magna Cum Laude in Chemistry. I obtained my MD-PhD degrees at Cornell University Medical College in Cell Biology and Genetics. From 1992-96, I was a Fellow at the Whitehead Institute at MIT. After several distinguished appointments at the Albert Einstein College of Medicine and the Kimmel Centre, I joined the Breakthrough Breast Cancer Research Unit in 2012 as Professor of Cancer Biology, at The University of Manchester, in the United Kingdom (UK).

Following my appointment to the Kimmel Cancer Centre in 2006, I was selected for the leadership of the Program in Molecular Biology and Genetics of Cancer. In 2009, I became the Chair of the Department of Stem Cell Biology and Regenerative Medicine at Thomas Jefferson University. I also served as the former Editor-in-Chief of the American Journal of Pathology. In Manchester, I previously held the Muriel Edith Rickman Chair of Breast Oncology.

Previously, I have lectured in various MD and PhD level graduate courses in Biochemistry, Cell Biology, Pharmacology, Pathology and Clinical Medicine, among others." 



For more information about MATCHA and the different GRADES of matcha, click on the button below:


For information about the excellent health benefits of Doctor King® Finest Ceremonial Grade Organic Japanese Matcha, why you ought to buy ORGANIC matcha (and organic food where feasible) and why you ought to buy JAPANESE matcha rather than Chinese matcha, click on the button below:




Japanese "Matcha contains 137 TIMES more antioxidants than regular green tea" (The Daily Telegraph, June 2013)


Japanese Matcha is "THE NEXT BIG THING, and to consumers hungry for ways of getting healthy without doing anything too radical, it fits the bill" (The Independent, November 2013)


"Organic food has more of the antioxidant compounds linked to better health than regular (non-organic) food, and lower levels of toxic metals and pesticides, according to THE MOST COMPREHENSIVE SCIENTIFIC ANALYSIS TO DATE"..."Switching to organic fruit and vegetables could give the same benefit as adding one or two portions of the recommended 'five a day'."...."There are statistically significant, meaningful differences, with a range of antioxidants being substantially higher - between 19 and 69% - in organic food." (The Guardian, July 2014)


Organic is "one of the BEST choices that we can make for the health of our families" (Time Magazine, June 2014).


Japanese Matcha is one of "five HEALTHY foods that will make their mark on 2016" (The Washington Post, January 2016)


"Gwyneth Paltrow and more STARS warming up to matcha"

After visiting NYC's Chalait (a trendy matcha bar in New York), Gwyneth Paltrow posted an Instagram with the message "New dreamy discovery to warm up a wintry day…" (Hello! Magazine, December 2015) (Photographs from various sources: Hello! Magazine, Instagram and others) 


Japanese matcha "will be 2016's BIGGEST SUPERFOOD (and Kylie Jenner and Gwyneth Paltrow are fans)" (Daily Mail, January 2016)


"Make way for matcha..."

"The trend has even developed into entire matcha destinations, such as MatchaBar and Cha Cha Matcha in New York City." (USA Today, January 2017)

"Japan's Prime Minister, Shinzō Abe, treats Great Britain's Prime Minister, Theresa May, to a traditional Japanese matcha green tea for two."

"The two leaders met at the Omotesenke Teahouse in the old imperial capital, where the teamaking ceremony dates back to a man called Sen no Rikyū, the 16th-century founder of the tradition".

(The Times, August 2017)

"The Top Food Trends For 2018" will include “Matcha”


"People who eat organic food are 25 percent less likely to get cancer"

"The risk of breast cancer after the menopause was 34% lower in organic eaters"

"The risk of non-Hodgkin's Lymphoma, a type of blood cancer, was 86% lower"

(The Times, 23 October 2018)


(The New York Times, 23 October 2018)


"In 2015, the International Agency for Research on Cancer classified 3 pesticides frequently used in [non-organic] agricultureglyphosate, malathion, and diazinon—as carcinogenic to humans (group 2A) based on evidence from studies of occupational exposure in humans and laboratory studies in animals....malathion is associated with prostate cancer, diazinon is associated with lung cancer, and all 3 pesticides are individually linked to non-Hodgkin lymphoma."

(JAMA Internal Medicine, 22 October 2018; JAMA is the Journal of the American Medical Association)