Herb Leaf (叶 yè)

Lu Cha

Green tea · 绿茶

Camellia sinensis (L.) O. Kuntze · Folium Camelliae Sinensis

Lu Cha (Green tea) plant

Images shown are for educational purposes only

Green tea is one of the world's most consumed beverages and has been used in Chinese medicine for thousands of years. It has a cooling nature that helps clear internal Heat, relieve headaches and mental fogginess, aid digestion after heavy meals, and quench thirst. It is best suited for people with robust constitutions and should be used cautiously by those with cold or weak digestion.

Category Herbs that clear Heat and resolve Toxicity (清热解毒药)
Therapeutic focus Digestive Health Mental Clarity and Focus Detoxification Cardiovascular Health

TCM Properties

Temperature

Cool

Taste

Bitter (苦 kǔ), Sweet (甘 gān)

Channels entered

Heart, Lungs, Stomach

Parts used

Leaf (叶 yè)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Lu Cha does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Lu Cha is primarily used to support these areas of health:

Digestive Health Mental Clarity and Focus Detoxification Cardiovascular Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Lu Cha performs to restore balance in the body:

Clears the Head and Brightens the Eyes Eliminates Irritability and Relieves Thirst Resolves Phlegm Promotes Digestion and Resolves Food Stagnation Promotes Urination Resolves Toxicity

How these actions work

'Clears the head and brightens the eyes' means green tea can relieve headaches, dizziness, and blurry vision caused by Heat rising upward or Phlegm obstructing the clear orifices. Its bitter taste has a descending nature that pulls Heat downward and away from the head, restoring mental clarity. This is why it has traditionally been used for drowsiness and mental fogginess.

'Eliminates irritability and quenches thirst' refers to green tea's ability to clear internal Heat from the Heart and Lungs, which generates body fluids and relieves the restless, agitated feelings that accompany Heat conditions. As the Ben Cao Jing Shu explains, when the sweet-cool nature enters the Heart and Lungs to clear Heat, fluids are naturally restored and thirst resolves.

'Resolves Phlegm' means green tea can help dissolve sticky accumulations of Phlegm, particularly when Phlegm-Heat is involved. Its bitter flavor has a drying and downward-directing quality that helps break up Phlegm in the Lungs and Stomach.

'Promotes digestion and dissolves food stagnation' reflects green tea's capacity to cut through greasy, heavy foods and aid the Stomach in breaking down food. The bitter taste promotes downward movement in the digestive tract, helping clear food that is sitting undigested. This is especially useful after heavy or fatty meals.

'Promotes urination' means green tea encourages the body to pass urine more freely, helping to drain Dampness and clear Heat through the urinary tract.

'Resolves toxins' refers to green tea's ability to neutralize various types of toxicity, including the effects of alcohol and rich foods. It has also been traditionally applied topically for sores and burns.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Lu Cha is used to help correct these specific patterns.

Why Lu Cha addresses this pattern

Green tea's cool, bitter nature directly counteracts Phlegm-Heat, a pattern where Heat and sticky Phlegm combine in the body. Its bitter taste has a descending, drying quality that breaks up Phlegm accumulation, while its cool temperature clears the Heat component. It enters the Lung and Stomach channels, which are the primary sites where Phlegm-Heat tends to lodge. Classical sources note that strong tea can even induce vomiting of thick Phlegm in severe cases, demonstrating its powerful Phlegm-clearing action.

A practitioner would look for one or more of these signs

Headaches

Headache from Phlegm turbidity rising to obstruct the head

Dizziness

Dizziness and heavy-headedness

Nausea Or Vomiting

Nausea from Phlegm in the Stomach

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough with thick, yellow phlegm

Commonly Used For

These are conditions where Lu Cha is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Phlegm-Heat Bright Yang Stomach Heat

TCM Interpretation

In TCM, headaches are not a single condition but arise from many different causes. Green tea is most relevant for headaches caused by Phlegm turbidity or Heat rising upward. When thick Phlegm accumulates in the middle burner and its turbid Qi ascends to block the clear orifices of the head, a heavy, splitting headache results. Similarly, excess Heat in the Stomach or Liver can flame upward along the channels that traverse the head. The head is considered the 'meeting of all Yang' and is particularly vulnerable to rising Heat and Phlegm obstruction.

Why Lu Cha Helps

Green tea's bitter taste has a strongly descending nature, which directly counters the upward movement of Phlegm and Heat toward the head. Classical sources describe this action as 'the bitter taste directs downward, which is why it can clear the head.' Its cool temperature addresses the Heat component, while its Phlegm-resolving action breaks up the turbid obstruction. The Qian Jin Fang describes using strong tea to treat sudden severe headaches caused by Phlegm in the diaphragm surging upward. When paired with herbs like Chuan Xiong, Bai Zhi, and Qiang Huo, it becomes even more effective for Wind-Heat headaches.

Also commonly used for

Nausea Or Vomiting

Nausea from Stomach Heat or Phlegm

Diarrhea

Damp-Heat dysentery (often paired with ginger)

Dizziness

Dizziness from Phlegm obstruction or Heat rising

Excessive Thirst

Thirst due to internal Heat or summerheat

Bad Breath

Halitosis from Stomach Heat or food accumulation

Urinary Difficulty

Scanty urination from Heat

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough with Phlegm-Heat

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cool

Taste

Bitter (苦 kǔ), Sweet (甘 gān)

Channels Entered

Heart Lungs Stomach

Parts Used

Leaf (叶 yè)

Dosage & Preparation

These are general dosage guidelines for Lu Cha — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

3-10g (as dried leaf for decoction or infusion)

Maximum dosage

Up to 15g daily as dried leaf infusion, or approximately 750-1000ml of brewed tea. Concentrated green tea extract supplements should not exceed 400-500mg EGCG daily for adults, as higher doses carry risk of liver injury.

Dosage notes

For clearing Heat and relieving thirst in summer: 3-5g steeped in warm water (around 70-80°C), drunk throughout the day. For harmonizing the Stomach and resolving food stagnation: 5-10g can be used, often combined with other herbs. Higher doses increase the risk of stomach irritation and insomnia due to greater caffeine and tannin extraction. People with sensitive stomachs should use lower doses and avoid drinking on an empty stomach. For therapeutic purposes beyond simple beverage use, the tea should be freshly brewed and not steeped for extended periods, as prolonged steeping extracts excessive tannins that can impair digestion.

Preparation

Unlike most decoction herbs, green tea is not boiled. It is steeped in water at 70-80°C for 30 seconds to 3 minutes. Boiling water destroys delicate aromatic compounds and releases excessive bitterness from tannins. When used in combination formulas, green tea is typically added at the end of the decoction process (hou xia) or infused separately and mixed with the strained decoction.

Common Herb Pairs

These ingredients are traditionally combined with Lu Cha for enhanced therapeutic effect

Ju Hua
Ju Hua 1:1 (e.g. 3g each, steeped together)

Ju Hua (Chrysanthemum) and Lu Cha both clear Heat and brighten the eyes, but they complement each other: Lu Cha's descending bitter quality clears Heat from the Stomach and drains Phlegm downward, while Ju Hua disperses Wind-Heat from the Liver channel and specifically targets the eyes. Together they address headaches, red eyes, and dizziness from Heat rising to the head more effectively than either alone.

When to use: Headaches, red or dry eyes, dizziness, and irritability from Liver and Stomach Heat, especially in summer or after alcohol consumption.

Sheng Jiang
Sheng Jiang 1:2 (Lu Cha 3g : Sheng Jiang 5-6g)

Sheng Jiang (Fresh Ginger) is warm and acrid while Lu Cha is cool and bitter. This pairing balances Yin and Yang: ginger's warmth prevents tea from overcooling the Stomach, while tea's coolness prevents ginger from generating too much Heat. Together they harmonize the Stomach, treat dysentery, relieve food stagnation, and resolve both Cold and Hot presentations of diarrhea.

When to use: Dysentery (both Hot and Cold types), nausea, food poisoning, and as a digestive tea for people with sensitive stomachs who still want the benefits of green tea.

Gou Qi Zi
Gou Qi Zi 1:1 (e.g. 3g Lu Cha : 5-8 pieces Gou Qi Zi)

Gou Qi Zi (Goji Berry) nourishes Liver and Kidney Yin and brightens the eyes, while Lu Cha clears Heat and sharpens vision by draining Heat from the head. Together, they address both the root (Yin Deficiency) and the branch (Heat rising) of eye problems and fatigue, and Gou Qi Zi's sweet, nourishing quality helps buffer tea's cold nature on the Stomach.

When to use: Eye strain, blurry vision, mental fatigue with underlying Yin Deficiency, and as a daily wellness beverage combining detoxification with gentle nourishment.

Chen Pi
Chen Pi 1:1 (e.g. 3g each)

Chen Pi (Tangerine Peel) regulates Qi, dries Dampness, and directs Qi downward in the Stomach and intestines. Combined with Lu Cha's Heat-clearing and food stagnation-dissolving properties, this pair effectively addresses bloating, nausea, and greasy food accumulation. Chen Pi's warm, aromatic quality also moderates tea's cold nature.

When to use: Bloating after heavy meals, nausea, poor appetite with a greasy tongue coating, and general digestive sluggishness.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Bo He
Lu Cha vs Bo He

Both clear the head and relieve headaches. However, Bo He (Mint) is acrid and cool, disperses Wind-Heat outward through the exterior, and releases the muscle layer. Lu Cha is bitter and cool, works by descending and draining Heat downward rather than dispersing it outward. Bo He is better for early-stage Wind-Heat invasion with fever and sore throat; Lu Cha is better for internal Heat or Phlegm-related headaches and mental fogginess. They are often combined in formulas.

Jue Ming Zi
Lu Cha vs Jue Ming Zi

Both clear the head, brighten the eyes, and promote healthy digestion. Jue Ming Zi (Cassia Seed) enters the Liver, Kidney, and Large Intestine channels and is stronger at moistening the intestines to relieve constipation and clearing Liver Heat to treat red, dry eyes. Lu Cha enters the Heart, Lung, and Stomach channels and is better at resolving Phlegm, promoting urination, aiding digestion of greasy foods, and promoting mental alertness. Choose Jue Ming Zi for constipation with Liver Heat; choose Lu Cha for food stagnation, Phlegm, and mental dullness.

Ku Ding Cha
Lu Cha vs Ku Ding Cha

Both are bitter teas used to clear Heat and brighten the eyes, but Ku Ding Cha (Broadleaf Holly Leaf) is much colder and stronger in its Heat-clearing action, entering the Liver and Lung channels. Ku Ding Cha is better for severe Liver Fire with headache and red eyes and for patterns requiring stronger cooling. Lu Cha is milder, enters the Stomach more directly, and is better suited for everyday use, food stagnation, and promoting gentle alertness. Lu Cha is also far more palatable for regular consumption.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Lu Cha

As a widely produced commodity, green tea is less subject to classical herb adulteration than rare medicinal substances. However, quality fraud is common: lower-grade summer or autumn teas are sometimes passed off as premium spring 'Ming Qian' picks. Non-Longjing varieties from other regions are frequently sold as authentic West Lake Longjing at inflated prices. In the dried herb trade, aged or improperly stored tea that has lost its therapeutic volatile compounds may be re-packaged as fresh product. When purchasing for medicinal use, verify the harvest date and origin. Fermented or oxidized teas (red/black tea, oolong) have different thermal properties (warm or neutral rather than cold) and should not be substituted for green tea when a cooling action is needed.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herb.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Lu Cha

Non-toxic

Green tea is classified as non-toxic and is one of the safest substances in the Chinese materia medica. However, excessive consumption (especially of concentrated green tea extracts in capsule form) has been associated with rare cases of liver injury, possibly linked to high doses of EGCG (epigallocatechin gallate). Caffeine content (approximately 30-50mg per cup) can cause insomnia, anxiety, heart palpitations, and restlessness in sensitive individuals or with excessive intake. The high tannin content (12-15% in green tea, compared to 5-6% in fermented teas) can cause stomach irritation, nausea, and impaired iron absorption when consumed on an empty stomach or in large quantities. Standard moderate consumption of brewed green tea (2-3 cups daily) is safe for the general population.

Contraindications

Situations where Lu Cha should not be used or requires extra caution

Caution

People with insomnia or severe sleep disorders. Green tea contains caffeine (2-3% by weight), which stimulates the central nervous system and can worsen sleeplessness.

Caution

People with Spleen and Stomach Cold or deficiency (frequent loose stools, cold abdomen, poor appetite). Green tea is cold in nature and can further damage an already weak digestive system, potentially causing diarrhea and abdominal discomfort.

Caution

Iron-deficiency anemia. The tannins in green tea (12-15%) bind dietary iron and significantly reduce its absorption, particularly when consumed near mealtimes.

Caution

Active peptic ulcer or acid reflux. Tannins in green tea can stimulate gastric acid secretion, especially when consumed on an empty stomach.

Avoid

People taking warfarin (blood-thinning medication). Green tea contains vitamin K, which can reduce warfarin's anticoagulant effect and increase clotting risk. Large or sudden changes in green tea consumption are especially dangerous.

Caution

Concurrent use of Wei Ling Xian (Radix Clematidis) or Tu Fu Ling (Rhizoma Smilacis Glabrae). Classical sources note that tea drinking is contraindicated when taking these herbs, as it may reduce their effectiveness.

Caution

During an acute Wind-Cold exterior pattern (common cold with chills, no sweating). Green tea's cold, bitter nature opposes the warming, dispersing strategy needed to expel exterior cold pathogens and may prolong illness.

Caution

Severe anxiety or heart palpitations. Caffeine content can aggravate nervousness, racing heartbeat, and existing anxiety conditions.

Classical Incompatibilities

Traditional Chinese pharmacological incompatibilities — herbs or substances to avoid combining with Lu Cha

Lu Cha does not appear on the classical Eighteen Incompatibilities (十八反) or Nineteen Mutual Fears (十九畏) lists. However, the Ben Cao Gang Mu notes that tea should not be consumed when taking Wei Ling Xian (Radix Clematidis) or Tu Fu Ling (Rhizoma Smilacis Glabrae), as it is believed to reduce their therapeutic effects.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Green tea should be used cautiously during pregnancy. Its caffeine content crosses the placenta, and excessive caffeine intake during pregnancy is associated with increased risk of low birth weight and, in some studies, miscarriage. The American College of Obstetricians and Gynecologists advises limiting caffeine intake to under 200mg per day during pregnancy. One to two cups of green tea daily (approximately 60-100mg caffeine) is generally considered within safe limits. However, EGCG may reduce the bioavailability of folic acid, a nutrient critical for preventing neural tube defects. Concentrated green tea extract supplements should be avoided during pregnancy due to the higher doses of both caffeine and catechins involved.

Breastfeeding

Green tea is generally considered compatible with breastfeeding at moderate intake (2-3 cups per day). Caffeine is excreted into breast milk, and very high maternal caffeine intake has been linked to fussiness, jitteriness, and poor sleep in nursing infants. The excretion of L-theanine (another active compound in green tea) into breast milk has not been studied. Giving tea directly to infants should be avoided, as tannins can interfere with iron absorption and potentially cause anemia. The tannin content of green tea is higher than fermented teas, so nursing mothers who drink large amounts should be aware of its potential effect on their own iron status.

Children

Green tea is generally not recommended for young children (under 6 years), primarily due to its caffeine content and the potential for tannins to impair iron absorption during a critical growth period. For older children (over 6), very dilute tea in small amounts is traditionally considered acceptable but should be limited. Concentrated green tea extract supplements should not be given to children. If used, dosage should be proportionally reduced (approximately one-quarter to one-half of the adult amount for children aged 6-12). Avoid giving tea near mealtimes to minimize interference with mineral absorption.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Lu Cha

Warfarin and anticoagulants: Green tea leaves contain vitamin K, which can oppose warfarin's blood-thinning effect. Large or sudden changes in green tea consumption can destabilize INR levels. Patients on warfarin should maintain consistent green tea intake and inform their anticoagulation clinic of any changes.

Beta-blockers (nadolol): Green tea has been shown to reduce blood levels of nadolol, potentially decreasing its blood-pressure-lowering effect.

Statins (atorvastatin, rosuvastatin): Green tea extract can reduce blood levels of certain statins used for cholesterol management, potentially diminishing their effectiveness.

Lithium: Sudden discontinuation of regular green tea consumption may cause lithium blood levels to rise, increasing the risk of lithium toxicity. Consistent intake is important for patients on lithium.

Stimulant medications and caffeine-sensitive drugs: The caffeine in green tea can potentiate or interact with stimulant drugs (ephedrine, amphetamines) and medications whose metabolism involves CYP1A2 (such as clozapine and fezolinetant), potentially raising their blood levels.

Iron supplements: Tannins in green tea bind iron and reduce its absorption. Iron supplements should be taken at least 2 hours apart from green tea consumption.

Dietary Advice

Foods and dietary considerations when taking Lu Cha

Avoid drinking green tea on an empty stomach, as tannins can stimulate excess gastric acid and cause nausea or stomach discomfort. It is best consumed 30-60 minutes after meals. Avoid consuming green tea together with iron-rich foods or iron supplements, as tannins significantly reduce iron absorption. When using green tea for its Heat-clearing properties, avoid concurrent consumption of very hot, spicy, or greasy foods, which would counteract its cooling therapeutic purpose. People with Cold constitutions or weak digestion should pair green tea with warming foods (such as ginger) to offset its cold nature, or consider switching to lightly fermented teas.

Botanical Description

Physical characteristics and morphology of the Lu Cha source plant

Camellia sinensis is an evergreen shrub or small tree belonging to the Theaceae (tea) family, native to the subtropical and tropical forests of southern China and Southeast Asia. When cultivated, it is typically kept pruned to waist height (about 1-1.5 metres) for ease of harvesting, but wild tea trees can grow up to 10 metres or more, with specimens in Yunnan and Sichuan reportedly reaching trunk diameters requiring two people to encircle them.

The leaves are alternate, oval to elliptical (5-10 cm long), with serrated margins, a glossy dark green upper surface, and a lighter underside. Young leaves and buds are often covered with fine silvery-white hairs. The flowers are small, white, fragrant, with 5-7 petals and prominent yellow stamens, blooming in autumn and early winter. The fruit is a round capsule containing 1-3 seeds. The plant thrives in warm, humid climates with well-drained acidic soils, often at elevations of 300-2000 metres, where mist and cloud cover provide ideal growing conditions.

Sourcing & Harvesting

Where Lu Cha is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Spring through summer (April to June). The finest grades are picked before the Qingming Festival (early April, called 'Ming Qian' tea) or before the Grain Rain solar term (late April, called 'Yu Qian' tea). Later pickings in May and June yield progressively lower quality.

Primary growing regions

Tea is cultivated across southern and central China, with major producing provinces including Zhejiang, Fujian, Anhui, Jiangxi, Hunan, Hubei, Sichuan, Guizhou, Yunnan, and Shaanxi. The most prized green tea varieties have strong regional identities (dao di yao cai concept): Long Jing (Dragon Well) from the West Lake area of Hangzhou, Zhejiang Province is considered the finest; Bi Luo Chun from Dongting Mountain, Jiangsu; Huang Shan Mao Feng from Huangshan, Anhui; Liu An Gua Pian from Lu'an, Anhui; and Tai Ping Hou Kui from Taiping, Anhui. Yunnan produces large-leaf varieties, while high-altitude misty mountain environments (cloud-shrouded peaks) are generally associated with superior quality.

Quality indicators

High-quality green tea leaves should be uniform in size, tightly rolled or flat (depending on variety), and display a vibrant, fresh green colour without yellowing or browning. The dry leaves should have a clean, fresh vegetal or chestnut-like aroma. When brewed, superior tea produces a clear, bright yellow-green liquor with a balanced sweet-bitter flavour and a pleasant lingering aftertaste (hui gan). The brewed leaves (ye di) should be soft, intact, evenly coloured, and bright green. Avoid tea that appears dull, dusty, or has a stale or musty odour, as this indicates age or poor storage. For medicinal use, look for spring-harvested 'Ming Qian' or 'Yu Qian' grades, which have the highest content of beneficial catechins and amino acids.

Classical Texts

Key passages from the classical Chinese medical texts that describe Lu Cha and its therapeutic uses

《新修本草》 (Xin Xiu Ben Cao / Newly Revised Materta Medica, Tang Dynasty)

Original: 「茗，味甘苦，微寒，无毒。」

Translation: "Tea (ming) is sweet and bitter in flavour, slightly cold in nature, and non-toxic."

《本草纲目》 (Ben Cao Gang Mu, Li Shizhen, Ming Dynasty)

Original: 「茶苦而寒，阴中之阴，沉也，降也，最能降火。」

Translation: "Tea is bitter and cold, the Yin within Yin. It sinks and descends, and is most effective at bringing down Fire."

《本草拾遗》 (Ben Cao Shi Yi, Tang Dynasty)

Original: 「食之宜热，冷即聚痰。久食令人瘦，使不睡。」

Translation: "It should be consumed warm; if taken cold it causes Phlegm to accumulate. Long-term consumption makes one thin and causes sleeplessness."

《神农本草经》传说 (Legendary attribution to Shen Nong Ben Cao Jing)

Original: 「神农尝百草，日遇七十二毒，得茶而解之。」

Translation: "Shen Nong tasted hundreds of herbs, and encountered seventy-two poisons in a single day; he obtained tea and was relieved of them." (Note: This famous saying is traditionally attributed to the Shen Nong Ben Cao Jing, though its exact textual provenance is debated among scholars.)

《神农食经》 (Shen Nong Shi Jing)

Original: 「茶茗久服，令人有力，悦志。」

Translation: "Taking tea over a long period gives one strength and lifts the spirit."

Historical Context

The history and evolution of Lu Cha's use in Chinese medicine over the centuries

Tea has one of the longest documented histories of any medicinal substance in China, with legendary origins tracing back to the mythical emperor Shen Nong, who is said to have discovered its detoxifying properties while tasting wild plants. The earliest written medical references appear in Tang Dynasty materia medica texts such as the Xin Xiu Ben Cao (新修本草, circa 659 CE), which classified tea as sweet-bitter and slightly cold. Lu Yu's (陆羽) Cha Jing (茶经, "The Classic of Tea," circa 760 CE) was the world's first monograph devoted entirely to tea, documenting its botany, preparation, and cultural significance, and it elevated tea drinking from a purely medicinal practice to a refined art.

In TCM, tea was initially valued purely as a medicine before becoming a daily beverage. Li Shizhen's Ben Cao Gang Mu (1578) provided the most systematic Ming-era analysis, describing tea as the ultimate Fire-descending substance. The Song Dynasty imperial court promoted tea culture extensively, and the Tai Ping Hui Min He Ji Ju Fang (太平惠民和剂局方) included tea-based medicinal formulas. Throughout Chinese history, the concept of "yi cha dai yao" (以茶代药, "using tea as medicine") developed into a distinct branch of practice called "tea therapy" (茶疗). The word "cha" (茶) itself evolved from the older character "tu" (荼), which originally referred to a bitter herb.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Lu Cha

1

Systematic review and meta-analysis of RCTs on green tea extract and body composition (2024)

Asbaghi O, et al. British Journal of Nutrition, 2024, 131, 1125-1157.

A large meta-analysis of 59 randomized controlled trials found that green tea extract supplementation produced statistically significant reductions in body mass (about 0.64 kg), BMI, and body fat percentage compared to controls. The antioxidant marker malondialdehyde (MDA) was also reduced, while beneficial adiponectin and total antioxidant capacity increased.

Link
2

Systematic review and meta-analysis of green tea supplementation on cardiovascular risk factors (2023)

Asbaghi O, et al. Frontiers in Nutrition, 2023, 9, 1084455.

A comprehensive meta-analysis of 55 randomized clinical trials examined the effects of green tea supplementation on blood lipids, blood sugar, and blood pressure. The analysis found significant reductions in total cholesterol and LDL cholesterol. Effects on triglycerides, fasting blood glucose, and blood pressure were more nuanced and depended on factors such as baseline values, duration of supplementation, and dosage.

Link
3

Meta-analysis of green tea and EGCG for cancer prevention (2024)

ResearchGate published meta-analysis, 2024, PROSPERO registration CRD42023484787.

A systematic review and meta-analysis of 43 studies (7 RCTs and 36 cohort studies) found that green tea consumption was associated with a modest but significant reduction in overall cancer risk (RR: 0.91). EGCG supplementation showed a stronger protective effect (RR: 0.72). Particularly notable risk reductions were observed for prostate, oral, and gallbladder cancers.

PubMed
4

Randomized controlled trial of sinecatechins for external genital warts (2008)

Stockfleth E, Beti H, Orasan R, et al. British Journal of Dermatology, 2008, 158(6), 1329-1338.

This RCT demonstrated that topical Polyphenon E (sinecatechins), a standardized green tea catechin extract, was effective and safe for treating external genital and perianal warts caused by human papillomavirus. The active compounds from green tea have since been approved by the FDA for this indication.

Link

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.