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Oolong tea benefits and does oolong tea have caffeine?



This article is about oolong tea benefits and does oolong tea have caffeine. This tea is semi-fermented tea from the leaf of Camellia sinensis manufactured mainly in China and Taiwan. Or simply oolong tea can be defined as an intermediate between green tea and black tea.

It is a traditional Chinese tea with amazing health benefits including anticarcinogenic, antioxidants, and antilipidemic activities. Due to its complex processing, oolong tea has a higher unit price than that other tea. Oolong tea is also consumed by only 2% worldwide.

Does oolong tea have caffeine? or How much caffeine does oolong tea have?

Oolong tea benefits and does oolong tea have caffeine

Yes like other traditional tea, oolong tea also contains caffeine. Besides this oolong tea has polyphenols and catechins (1). Oolong tea contains 13 to 40 mg/cup of caffeine depending on the steeping time from 1 to 5 minutes. Caffeine consumption for adults should be between 120 mg per day and 1.73 mg/kg body weight per day.

Details of oolong tea components in mg/100 ml

Compound Amount mg/100ml
Catechin (C) 1.65
Gallocatechin (GC) 6.68
Epigallocatechin (EGC) 16.14
Epicatechin (EC) 5.08
Epicatechin gallate (ECG) 5.73
Epigallocatechin gallate (EGCG)  25.73
Allocatchin gallat 1.85
Gallic acid 2.19
caffeine 23.51
Polymerized 33.65
Total Phenol 99.32

Besides this other components of oolong tea are Caffeine, Amino acids, and Protein

Health benefits of Oolong Tea

1. Weight loss

Oolong tea specially aged tea induces weight loss and reduces fat accumulation. A study done on animal models suggests that oolong tea helps in the reduction of adipose tissue weight and adipocyte size (2). Therefore drinking oolong tea helps in reducing obesity.

2. Healthy Liver

Oolong tea also helps in lowering the lipid level in serum and liver and thus is healthy for the liver. It also plays an important role in lipid metabolism and protects the liver and energy metabolism (2).

3. Prevents cancer

Studies suggest that oolong tea has the potential in preventing cancer. the compound epigallocatechin- 3- gallate present in oolong tea shows the prevention of cancerous cell development (3).

4. Hypoglycemic effect

Another health benefits of oolong tea are its ability to reduce plasma glucose and fructosamine level. Oolong tea also increases insulin activity and decreases serum and liver lipids. thus drinking oolong tea helps in controlling diabetes and is highly preferred for diabetic persons (4).

5. Control cholesterol

Daily consumption of oolong tea helps in normalizing the cholesterol level by reducing the lipid peroxide and dismutase the super activity level (5).

6. Increase antioxidant activity

Oolong tea consumption helps in decreasing oxidative stress and prevents DNA damage (6). Studies done on athletes show that oolong tea decreases oxidative stress and lipid peroxidation levels (5).

7. Prevents hypertension and atherosclerosis

Consumption of oolong tea helps in increasing the fat oxidation and metabolic rate of the body. Studies show that daily consumption of 120ml oolong tea helps in reducing hypertension in Taiwan (6).

8.  Health benefits due to polyphenols present in Oolong tea

Polyphenols in oolong tea help in Lowering LDL cholesterol levels. It also Inhibits abnormal blood clots and reduces platelet aggregation. Drinking oolong tea also regulates the lipid and inhibition of proliferation and migration of smooth muscle cells. It also boosts the immune system of the body.

9. Health Benefits due to Caffeine present in Oolong tea

Caffeine helps in increasing the metabolic rate of the body. It reduces the risk of Type-2 Diabetes, liver diseases, and cancer. Caffeine stimulation excites the brain and central nervous system.

More health benefits and side effects read GABA green & oolong tea

Side Effects of Oolong Tea

Side effects of oolong tea are due to its excessive consumption. As the tea contains caffeine and polyphenols, therefore, it should be consumed at the limit.

1. Side effects due to polyphenols

Defective RBC is manufactured because of disturbed iron bioavailability resulting in anemia. It May interferes with DNA repair. Other side effects are Intestinal gas, Nausea, Heartburn, Stomach ache, Dizziness, and Muscle pain

2. Oolong tea side effects due to caffeine

Insomnia, dizziness, headache, nervousness, and uneven heart rate. High blood pressure. Excessive urination thus loss of water and minerals (more than 225 mg/day) (7). Releases acid in the stomach thus making the stomach upset.

3. Inhibits iron absorption

Overconsumption inhibits iron absorption, therefore, anemic people should avoid it. Too much caffeine may increase the risk of abortion and affect certain medications (7).

Green tea caffeine: Benefits & Side Effects



Green tea is mainly derived from the plant Camellia Sinensis. It is basically unfermented that it is not exposed to air and additives C. Sinensis leaves. Almost 20% of the world population consumed green tea. Taking green tea is good for health but excess causes side effects because of green tea caffeine.

What are the medicinally beneficial components and functions of green tea?

Polyphenolic compounds (catechins, epicatechin (EC), epicatechin-3-gallate (ECG), epigallocatechin (EGC), and epigallocatechin-3-gallate (EGCG)). Gallic acid, quercetin, kaempferol, myricetin, and caffeic acid.
Epigallocatechin-3-gallate (EGCG) acts as an anti-oxidant: inhibits and kills cancer cells without harming healthy tissue. Lowers LDL cholesterol levels, inhibits the abnormal blood clots, reduction of platelet aggregation, lipid regulation and inhibition of proliferation and migration of smooth muscle cells. Boost the immune system.

What are the potential side effects of green tea?

1. Caffeine

Green tea contains 30-60 mg caffeine per 6 to 8 oz cup. Although the amount is normal or less than the average cup of coffee (100 mg) but it is generally consumed in greater amounts because of its highlighted advantages.

2. Anemia

It also contains tannins that bond with iron and makes iron hard to absorb. Per cup reduces 30 to 60 percent absorption leads to the anemic condition. Iron deficiency anemia can cause feelings of weakness, shortness of breath, irritability, headaches, and irregular heartbeat. So anemic patients should use it cautiously if taken in a high amount.

3. Dehydration

Green tea also is a natural diuretic. Therefore, drinking extreme amounts of green tea (more than five cups /day) causes excessive urination leading to dehydration and electrolyte disproportion. Dehydration can also lead to headaches, lethargy, changed heart rate, and distress.

4. Folate deficiency

According to the website World’s Healthiest Foods, one cup of green tea supplies 20 to 35 mg of Epigallocatechin-3-gallate (EGCG) which interferes with folate use in cells (American Association of Cancer Research study).

What is Folate?

Folate is important for the development of new DNA and it prevents any negative changes in the DNA from cancers. Besides these, it helps in RBC production, Protect heart disease, and prevents anemia.

Benefits and side effects of Green Tea in brief

Health benefits of green tea

1. Anticancer
2. Prevents liver disease
3. Prevents heart disease
4. Antidiabetics
5. Skin disorder
6. Reduce hair loss
7. Weight loss.

Side effects of green tea 

1. Nausea

2. Vomiting

3. Dehydration

4. Lethargy

5. Dizziness

6. Insomnia

7. Tremors

8. Restlessness

9. Confusion

10. Diuresis

11. Heart rate irregularities

12. Psychomotor agitation

How many cups of green tea should I consume every day?

Depending on the brand, two to three cups of green tea per day (for a total of 240–320 mg polyphenols) or 100–750 mg per day of standardized green tea extract is recommended

Black Tea Benefits, Side Effects & Common Myths



Black tea is produced from  Camellia sinensis. Tea leaves contain polyphenols namely catechins. Processing of black tea includes the complete oxidation of catechins into oligomeric flavanols includes theaflavin which gives it a brisk taste. The full fermentation of tea leaves along with caffeine gives black tea its characteristic color and aroma. Almost 78% of western countries consumed black tea. The black Tea health benefit is as follows

What is Theaflavin?

During the process of full fermentation, the polyphenols namely catechins get oxidized with the help of biocatalysts. Theaflavin is responsible for the specific taste of black tea.

Common myths of Black tea?

1. Protect DNA damage and suppress cancer by stopping mutagenicity

Experiments showing strong evidence showed that black tea may suppress cancer in animals in laboratory conditions. But still, there is a lack of research related to its effect on humans.

2. Reduce bad cholesterol

The long-term effects of tea consumption on cardiovascular risk factors, such as cholesterol levels and atherosclerosis, are not fully understood.

3. Weight Loss

It reduces weight but there is still a lack of evidence on the human model that it alone helps in weight loss.

4. Reduce stress

It contains caffeine that may help in the reduction of stress but caffeine also when taken in excess amount causes anxiety.

5. Lowers blood sugar

Black tea helps in lowering the blood sugar level of the body.

6. Protects osteoporosis

More than 3 cups of black tea should be consumed to make it effective. But high consumption of black tea should be avoided as it might cause certain hindrances in the normal activity of the body.

What are the potential side effects of Black tea?

  • Caffeine content: One cup of tea contains about 50 milligrams of caffeine. Caffeine acts as a stimulant for the central nervous system. Excess caffeine causes sleeplessness. Excess intake of black tea may cause kidney diuretic. This results in frequent urination leading to a decrease in blood sodium and potassium. Although caffeine content in black tea is lesser than that of coffee but on an average maximum of 2 to 3 cups will be taken.
  • Caffeine may cause an adverse effect on diabetic patients
    Pregnant women should avoid caffeine as it crosses the placenta and caused abortion.
  • Caffeine also interferes with breast milk leads to sleep disorders in babies.
  • The normal mean caffeine content of black tea is 21-33 mg/cup after 1 minute of steeping, 35-46 mg/cup after 3 minutes of steeping, and 39-50 mg/cup after 5 minutes of steeping.

Black Tea health benefit

Following are some of the black Tea health benefit:

· Anticancer
· Prevents heart disease
· Weight loss
· Lowers blood sugar
· Protects osteoporosis
· Reduce stress
· Reduce Cholesterol

Side Effects of the Black Tea

· Arrhythmia – irregular heartbeat.
· Hypertension
· Tachycardia – rapid heart rate.
· Insomnia
· Tremor
· Iron deficiency
· Diuresis – excessive urination.
· Constipation
· Anaemia
· Abortion

  1. Journal of Pharmaceutical and Sciences and Research
  2. Rodman Media

Most Popular Tea and health benefits


While there are hundreds of varieties of tea available in the market. All the different teas have their own health benefits and side effects. We’ll cover popular ones in-depth and explain the side effects and positive effects of each one. As per our motto, we’ll share all the scientific research and validity of the claims made by the majority of health-related websites. Therefore following are the 10 most popular Tea and their benefits.

The most popular tea with health benefits

1. Green Tea health benefits and side effects  – it’s mainly derived from the plant Camellia Sinensis. It is basically unfermented and is not exposed to air and additives C. Sinensis leaves.

Green Tea Side Effects & Health Benefits

2. Black Tea health benefits and side effects  – Fully fermented leaves of Camellia Sinensis give the characteristic black color of black tea.

black tea health benefits and side effects

3. Yellow Tea health benefits and side effects – This is also produced from Camellia Sinensis leaves. The color of this tea is mainly because of the water-soluble flavonols.

Yellow Tea health Benefits and common myths

4. White Tea health benefits and side effects – The color of this tea is mainly because of the low fermentation of leaves of C. sinensis.

5. Oolong Tea health benefits and side effects  – This is also manufactured from Camellia Sinensis leaves. It is a semi-fermented or partially fermented leaf.

Oolong Tea health benefits and side effects

6. Red Tea (Rooibos Tea) health benefits and side effects  – This special tea is derived from the plant Aspalathus linearis. It is naturally caffeine-free and has high antioxidant content in tea, therefore, making it a good choice for pregnant or breastfeeding women.

Rooibos Tea health benefits and side effects

7. Ph-erh Tea: Pu-erh tea is a microbially fermented tea derived from dried leaves of large-leaf tea species (Camellia sinensis (Linn.) originated in the Yunnan province of China.


8. GABA Tea health benefits and side effects: GABA is an amino acid that acts as an anti-stress and anti-anxiety component with a calming and relaxing effect. GABA accumulates in green, oolong, and black teas under anaerobic(Oxygen Free) conditions.

GABA tea health benefits and side effects

9. Chaga Mushroom Tea health benefits and side effects  – As the name itself says mushroom tea is a type of tea which are extracted from different mushrooms like Reishi Mushroom, Kombucha, and Chaga mushrooms.

chaga mushroom health benefits and side effects

10. Herbal Tea health benefits and side effects – These are tea derived from fruits, other herbs, and spices. It doesn’t contain any caffeine like other tea.

Herbal Tea

Facts about superfoods and examples

How super are the superfoods?

Superfoods are nowadays in demand. With fast-track, life, and an increase in awareness about healthy foods people are taking more and more interest in superfoods. Therefore what a superfood really is? Did they really have the healing properties for some diseases or those claims are just a hoax? Is there any scientific truth behind the same? Hence, superfoods are those foods that contain certain specific vitamins, minerals, antioxidants, and other essential nutrients above the normal quantity. Some of the facts about superfoods are as follows

1. Yes these foods are good for health but complete knowledge is very important

Superfoods are good for health and may give some health benefits but it is very important to understand how much should we take. For example, asparagus is a superfood and is rich in vitamins and minerals. Good for pregnant women and is diuretic in nature. But one should avoid eating asparagus if suffering from any kind of kidney dysfunction or diarrhea. As its diuretic property may cause problems in the above cases.

2. What makes a food a superfood

Superfoods are foods having more vitamins, minerals, nutrients, and antioxidants. These foods are good because of their anticancerous, antioxidant, and other beneficial properties. For example, the high lignan present in flaxseeds makes them a superfood. This high lignan acts as an antioxidant and is antidiabetic in nature. Flaxseed is also gluten-free thus helping in reducing the cholesterol level.

But we have to keep in mind that if a superfood has good stuff which is beneficial for health then it may also contain some bad stuff that affects health when taken in large quantities. Flaxseed also contains hydrogen cyanide although it is far below the estimated toxic level. But it was recommended that an individual should take not beyond 1-2 tablespoons of flaxseed per day.

Healthy Diet versus superfoods

As we are all aware that a healthy diet is a must to live a good life. A healthy balanced diet is a combination of many foods with various properties. A healthy complete diet fulfills the basic essential need of a body. It is the combination of all vitamins, minerals, carbs, etc in a specific portion required according to body type and gender.
Before eating anything specific for a specific problem we should understand the basic science behind that food. Whatever the component, which is good for health, we should understand their overdose and underdose before taking them. So before jumping to any conclusion let’s just read the basics of each so call food component and its activities.

Some of the top superfoods and their health benefits with side effects are thus summarised below

1. Mushrooms

The general benefits of mushrooms are antimicrobial, rich in proteins, and good for red blood cells, and white blood cells. Having mushrooms in the diet thus keeps away the hematological problem. But excess intake may cause liver damage, and fungal contamination by eating stale mushrooms.

2. Pinto beans

These beans are rich in vitamins, minerals, and amino acids. It is also rich in prebiotics. Because of these compounds, these beans help in lowering blood pressure a prevent heart diseases. But excessive intake may cause gas problems, abdominal pain, and vomiting.

3. Cumin seeds

They are rich in carbohydrates, fiber, lipids, and minerals like calcium, iron, potassium, vitamin C, B12, B-6, and folates. Thus acts as an anti-diabetic, and an immune booster increases lactation and reduces stress. But excessive intake of cumin seeds may cause low blood pressure, male sterility, and liver cancer.

4. Fenugreek seeds

The fenugreek seeds are well known for their anti-diabetic nature, prevent heart-related problems, increase lactation, and reduce stroke. But excess intake of fenugreek seeds is not good for people who have low blood sugar and low blood pressure.

5. Asparagus

This vegetable is rich in vitamins, minerals, and dietary fibers. They are low in calories and high in glutathione and are also rich sources of folic acids. The glutathione present in asparagus is mainly responsible for its diuretic properties. But excessive intake is not good for those who are suffering from kidney dysfunctions.

6. Portobello mushrooms

Mushrooms are always known for their high protein and mineral content. Portobello mushrooms help in the reduction of estrogen levels in the body thus preventing breast cancer. It also protects heart-related problems and improves memory. But excessive intake may cause allergy. also one should cook the mushroom properly because of a hydrazine derivative compound.

Green tea side effects & health benefits

Tea side effects

This article will focus on discussing both potential side effects as well as the positive health benefits of green tea, based on relevant literature and research. While many articles highlight the benefits of tea, there are relatively few that specifically elaborate on its negative effects

Tea has a rich history, evolving from a medicinal drink to a popular beverage over the past 2000 years. Not only does tea provide health benefits, but it also helps in connecting socially. The scientific community has taken an interest in tea due to its widespread use and cultural significance. Research on the physiological effects of green tea has mainly been conducted in lab conditions or using animal models. Green tea’s health benefits are due to compounds such as polyphenols, caffeine, carbohydrates, vitamins, amino acids, and purine alkaloids. While these compounds are generally beneficial for health, it’s important to consume them in appropriate or in limited amounts. The main compounds in green tea include polyphenols, caffeine, and metals like aluminum (1).

Green tea has 30-60mg of caffeine per 6-8 oz. cup, which is less than coffee’s average 100mg. However, weight loss regimes may increase consumption. If 5+ cups are consumed per day, it raises caffeine intake to unsafe levels, increasing the risk for insomnia, restlessness, tremors, and upset stomach (5).

Let us see the side effects of green tea first.

1. Side effects due to Polyphenols and EGCG in tea

Although compounds like Polyphenols and EGCG are good for the body if taken in a controlled amount. Excessive drinking of green tea causes some serious side effects due to the presence of Polyphenol (Catechin) and epigallocatechin-3-gallate (EGCG).

Especially for people suffering from anemia, heart disease, and indigestion problems. Following are the 11 main side effects of taking tea in excess

a. Blocks iron absorption in the body

Iron deficiency anemia is common globally, caused by chronic blood loss and insufficient iron intake or absorption from food. Research shows that iron absorption can be hindered by tea consumption. This is due to the iron-binding properties of phenolic compounds with catechol groups in tea (2).

b. Disturbs RBC formation because of improper folate function

Tea polyphenol, epigallocatechin-3-gallate, is an efficient inhibitor of human dihydrofolate reductase. This disturbs the RBC formation by inhibiting the folate formation (3).

c. Causes Anaemia

Green tea hinders folate formation thus affecting RBC production which eventually leads to anemia.

d. Tooth staining

The components present in green tea like polyphenols cause tooth staining. Thus excessive drinking of green tea results in discoloration of the teen (4).

e. Dehydration

One of the properties of green tea is that it is a natural diuretic. Hence drinking too much green tea around 5-6 cups a day causes excessive urination which ultimately results in dehydration, headache, lethargy, and distress, or sometimes may change in heart rate.

f. Effects on medication

Green tea causes a positive or negative effect on medication depending upon the type of medicine you are taking. According to the reports of The University of Maryland Medical Center, medications such as MAOI inhibitors, lithium, adenosine, and blood thinners can be affected by green tea.

2. Green tea side effects due to caffeine

Caffeine is one of the main ingredients of green tea which has both positive and negative side effects. Although the normal amount helps in keeping the body energetic and stress-free. However the excess amount of caffeine results in insomnia, restlessness, and other types of problems. Following are in short the health benefits and side effects of caffeine

a. Stimulation of the nervous system

Consuming too much green tea (5-6 cups a day) with caffeine can overstimulate the central nervous system and cause symptoms like dizziness, trouble sleeping, shaking, restlessness, difficulty focusing irritability, and hyperactivity.

b. Heart-related issues

Caffeine also causes hypertension, tachycardia, and heart rate irregularities.

c. Other side effects

Excessive intake of green tea also causes sleep deprivation, Restlessness, vomiting, epigastric pain, tremors, palpitations, diarrhea, etc.

3. Side Effects of green tea due to metals

Some metals like arsenic, cobalt, nickel, etc present in green tea although they are in very small amounts excessive consumption may cause dental fluorosis; Due to arsenic’s increased carcinogenic risk.

Consuming 1-2 cups of green tea per day is generally considered safe and may provide many health benefits. Due to being rich in antioxidants, particularly catechins, which help in protecting against cell damage. Also reduces the risk of chronic diseases like heart disease, diabetes, and cancer. Lowers the risk of developing certain neurological conditions, such as Alzheimer’s and Parkinson’s disease. Some of the health benefits of green tea are as follows

Green tea health benefits due to Polyphenols and Caffeine

1. Tea helps in reducing the blood lipid

Green tea or tea helps in the reduction of blood cholesterol and lipids thus strengthening the heart and making the body more active. Therefore drinking tea may help in providing a good healthy heart and active body.

2. Antimicrobial properties of green tea

The secondary metabolites that are present in the tea have antimicrobial properties. Hence helps in fighting against many microbial diseases. It at least gives a certain amount of relief when consumed.

3. Rich antioxidant activity of tea

Of course, everybody is very familiar with the fact of its antioxidant nature. Tea consumption helps in minimizing the free radical activity of the body and thus acts as an antioxidant.

4. Anticancerogenic properties of tea

Again tea contains many secondary metabolites that help in protecting the DNA from damage. It controls the free radicals in the body and unwanted DNA damage.

5. Drinking tea enhances digestion

Green tea helps in solving the digestion problem. It is also advisable by some dieticians that drinking jasmine green tea before bed helps in digestion and thus gives a relaxing sleep.

6. Tea helps in weight loss

The secondary metabolite that is catechins helps in the burning of extra cholesterol and fat resulting in weight reduction.

7. Protecting skin damage

The components present in the tea, like EGCG and catechins, are also helped in protecting the skin. These compounds help in breaking the free radicals present in the cell and thus protect from cell damage and skin abnormalities.

8. Reduce the risk of Alzheimer’s and dementia

Caffeine present in green tea helps in reducing neurological disorders like Alzheimer’s and dementia.

9. Reduce Stroke and Type 2 diabetes

Green tea helps in reducing stroke risk and also controls type 2 diabetes due the caffeine.

4. Instant energy

Green tea acts as an energy booster. The caffeine in green tea provides instant energy, therefore, having green tea helps in relieving tiredness.