Nootropic: Green Tea

Green Tea

green teaGreen Tea contains flavonoids and Theanine, which are responsible for their health benefits. Recent studies have proven Green Tea to be extremely healthy.

Benefits: neuroprotectant, protects against cardiovascular disease, antioxidant

Brand Names: n/a

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What is Green Tea?


Originating in China, Green Tea is created with the leaves of a flowering plant called Camellia sinensis. Green Tea has been used in Asia as a traditional medicine to treat various conditions including poor digestion, healing of wounds, and body temperature regulation. It has since become more and more popular in Western countries.

As this nootropic’s popularity skyrocketed, it has become the subject of many scientific studies. The medical community is looking into the possible long-term and short-term health benefits associated with this completely safe and commonly consumed beverage.

How Does Green Tea Work?


The main ingredient associated with Green Tea is flavonoids. Flavonoids are a class of secondary plant metabolites also known as Vitamin P. While flavonoids can be found in other plant sources, its concentration is most potent in Green Tea. [9] Flavonoids are biological ‘response modifiers’ and research indicates that they can modify allergens, viruses, and carcinogens. Studies have indicated that flavonoids work to provide many health benefits:

  • Increases regulatory T cells in the body which boosts the body’s immune system. [11]
  • Act as strong topoisomerase inhibitors which helps fight microbial (any microorganism) infections and prevent cancer [7][8][1][2][3][4]
  • Provides stronger antioxidant properties than vitamins C and E [5]
  • Assist with digestion, helps the colon [6]

Benefits of Green Tea


  •  Slight boosts the body’s metabolism and helps prevent obesity [14][10]
  • Strengthens the immune system and decreases the chance of contracting autoimmune disorders [11]
  • Helps prevent bacterial and viral infections [2][3][4][7][8]
  • May help prevent cancer [7][8][1]
  • Prevents cognitive impairment and may slightly boost cognitive function [13]
  • Decreases mortality due to cardiovascular disease [12]

Should I Use Green Tea?


Even though green tea provides a large assortment of health benefits, it has very mild nootropic properties. If you are simply looking to boost your cognitive function then you should pass on green tea. However, it is one of the more deeply studies nootropics on this side. It helps fight bacterial infection, viral infections, prevent cancer, prevent cardiovascular disease, prevent cognitive decline, and prevent obesity.

Working green tea into your routine is as simple as replacing your cups of coffee in the morning with green tea or taking a single pill at lunch. Green tea will certainly help you live a healthier life. If overall health is something you are even a bit concerned about then you should definitely make an investment in green tea.

Green Tea Synergy With Other Nootropics


  • Consumption of mushroom and green tea has been linked to lower breast cancer occurrence by up to 90% [15]
  • Green tea and caffeine (usually contained in green tea) consumption has been shown to stimulate fat oxidation and boost the body’s metabolic rate by up to 4% [10]

Green Tea Dosage Information


There is no universally recommended dosage for green tea. Different sources may recommend anywhere from 1 to 10 cups per day. I would recommend a middle ground approach of 3-5 cups per day. Green tea consumption in Asian countries suggests 3 cups per day.

Keep in mind that green tea contains caffeine; this includes green supplements and tablets. The best advice I can give is to follow any dosing instructions provided on the green tea supplement product you purchase.

Safety and Side Effects of Green Tea


Green tea itself is regarded as very safe with almost no side effects. However, because it contains caffeine it is not recommended to exceed 5 cups per day. Side effects of excessive consumption due to caffeine may include nervousness, headaches, sleep problems, irritability, and dizziness. [16]

There have been a small number of reported cases involving liver damage with the long-term consumption of green tea. Studies have found that this risk can be greatly reduced or eliminated if green tea is consumed on a full stomach. [18][19]

Because of the caffeine, green tea may interact with other stimulants. If you are taking any sort of stimulant you should limit your dosage or find a green team supplement with no caffeine.  One study also revealed green tea may limit the effectiveness of the anti-cancer drug bortezomib. [17]

Where Can I Buy Green Tea?


Green Tea is sold nearly everywhere, finding it is as easy as going to any grocery store. If you prefer to take a capsule of Green Tea extract it can be found in some pharmacies, and is easy to find online.

Compare prices of Green Tea with our Buyer’s Guide (in progress), or Buy Green Tea Extract Now!

Green Tea Studies


A study to investigate the joint effects of mushrooms and green tea on breast cancer was conducted in 2004. It examined 1,009 female patients aged 20-87 years with historical occurrences of breast cancer, and used 1,009 healthy control patients of similar ages. The diets and lifestyles of the two groups were compared, particularly the intake of green tea and mushrooms. The study found that just mushroom consumption or just green tea consumption slightly decreased the risk for breast cancer. It also found that consumption of both green team and mushroom decreased the risk of breast cancer more than either one by itself. [15]

Another study conducted in 2006 looked into green tea’s effect on cognitive function in humans. The study examined 1003 Japanese women aged over 70 by evaluating their cognitive function and measuring their lifetime green tea consumption.  The study concluded that higher consumption of green tea was associated with significantly lower occurrence of cognitive impairment.  [13]

Cited Sources


1.  “Therapeutic potential of inhibition of the NF-κB pathway in the treatment of inflammation and cancer”. Yamamoto and Gaynor 107 (2): 135 — Journal of Clinical Investigation. http://www.jci.org/cgi/content/full/107/2/135?ijkey=a1e09ce2dbca283cec170598f2410b15d5f4304f&keytype2=tf_ipsecsha.

2.  Cushnie TPT, Lamb AJ (2005). “Antimicrobial activity of flavonoids”. International Journal of Antimicrobial Agents 26 (5): 343–356. doi:10.1016/j.ijantimicag.2005.09.002. PMID 16323269.

3. Cushnie TPT, Lamb AJ (2011). “Recent advances in understanding the antibacterial properties of flavonoids”. International Journal of Antimicrobial Agents 38 (2): 99–107. doi:10.1016/j.ijantimicag.2011.02.014. PMID 21514796.

4.  Cushnie TPT, Lamb AJ (2011). “Recent advances in understanding the antibacterial properties of flavonoids”. International Journal of Antimicrobial Agents 38 (2): 99–107. doi:10.1016/j.ijantimicag.2011.02.014. PMID 21514796.

5. Bagchi Manashi, Mark Milnes, Casey Williams, Jaya Balmoori, Xumei Ye, Sidney Stohs and Debasis Bagchi (1999). “Acute and chronic stress-induced oxidative gastrointestinal injury in rats, and the protective ability of a novel grape seed proanthocyanidin extract”. Nutrition Research 19 (8): 1189–1199. doi:10.1016/S0271-5317(99)00080-9.

6. Schuier M, Sies H, Illek B, Fischer H (1 October 2005). “Cocoa-related flavonoids inhibit CFTR-mediated chloride transport across T84 human colon epithelia”. J. Nutr. 135 (10): 2320–5. PMID 16177189. http://jn.nutrition.org/cgi/reprint/135/10/2320.

7. Delphinidin Modulates the DNA-Damaging Properties of Topoisomerase II Poisons. Esselen, Jessica Fritz, Melanie Hutter and Doris Marko, Chem. Res. Toxicol., 2009, 22 (3), pp 554–564 doi:10.1021/tx800293v

8. Bandele, O.J.; Clawson, S.J.; Osheroff, N. (2008). “Dietary polyphenols as topoisomerase II poisons: B-ring substituents determine the mechanism of enzyme-mediated DNA cleavage enhancement”. Chemical Research in Toxicology (6): 1253–1260 doi:10.1021/tx8000785

9.  USDA Database for the Flavonoid Content of Selected Foods, Release 2.1 (2007)

10.  Dulloo AG, Duret C, Rohrer D, Girardier L, Mensi N, Fathi M, Chantre P, Vandermander J (1999). “Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans”. Am. J. Clin. Nutr. 70 (6): 1040–5. PMID 10584049. http://www.ajcn.org/cgi/content/full/70/6/1040.

11.  “Mechanism Discovered for Health Benefit of Green Tea, New Approach to Autoimmune Disease”. Science Daily. 3 June 2011. http://www.sciencedaily.com/releases/2011/06/110602143214.htm. Retrieved 12 September 2011.

12. Kuriyama S, Shimazu T, Ohmori K, et al. (September 2006). “Green tea consumption and mortality due to cardiovascular disease, cancer, and all causes in Japan: the Ohsaki study”. JAMA 296 (10): 1255–65. doi:10.1001/jama.296.10.1255. PMID 16968850. http://jama.ama-assn.org/cgi/pmidlookup?view=long&pmid=16968850.

13. Kuriyama S, Hozawa A, Ohmori K, et al. (February 2006). “Green tea consumption and cognitive function: a cross-sectional study from the Tsurugaya Project 1″. Am. J. Clin. Nutr. 83 (2): 355–61. PMID 16469995. http://www.ajcn.org/cgi/pmidlookup?view=long&pmid=16469995.

14. Nagao T, Komine Y, Soga S, et al. (January 2005). “Ingestion of a tea rich in catechins leads to a reduction in body fat and malondialdehyde-modified LDL in men”. Am. J. Clin. Nutr. 81 (1): 122–9. PMID 15640470. http://www.ajcn.org/cgi/pmidlookup?view=long&pmid=15640470.

15. Zhang, M; Huang, J; Xie, X; Holman, CD (2009). “Dietary intakes of mushrooms and green tea combine to reduce the risk of breast cancer in Chinese women.”. International Journal of Cancer 124 (6): 1404–8. doi:10.1002/ijc.24047. PMID 19048616.

16.  http://www.webmd.com/vitamins-supplements/ingredientmono-960-GREEN%20TEA.aspx?activeIngredientId=960&activeIngredientName=GREEN%20TEA

17. Golden, E.; Lam, PY; Kardosh, A; Gaffney, KJ; Cadenas, E; Louie, SG; Petasis, NA; Chen, TC et al. (2009). “Green tea polyphenols block the anticancer effects of bortezomib and other boronic acid-based proteasome inhibitors”. Blood 113 (23): 5927–5937. doi:10.1182/blood-2008-07-171389. PMID 19190249.

18.  Sarma DN, Barrett ML, Chavez ML, et al. (2008). “Safety of green tea extracts : a systematic review by the US Pharmacopeia”. Drug Saf 31 (6): 469–84. doi:10.2165/00002018-200831060-00003. PMID 18484782. http://www.drugsafety.adisonline.com/pt/re/drs/fulltext.00002018-200831060-00003.htm;jsessionid=J81YxCnjct76DjB2STGgngMCsJn3FLqPxvmL6GJjjT7phpHTTyq2!928310026!181195629!8091!-1#P157.

19. Wu, Kuei-Meng; Yao, Jiaqing; Boring, Daniel (2011). “Green Tea Extract-Induced Lethal Toxicity in Fasted but Not in Nonfasted Dogs”. International Journal of Toxicology 30 (1): 19–20. doi:10.1177/1091581810387445. PMID 21098339. http://ijt.sagepub.com/content/30/1/19. Retrieved 2011-03-14.

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