Does oolong tea have caffeine?


This article is about oolong tea benefits and does oolong tea has 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 of other tea. Oolong tea is also consumed by only 2% worldwide.

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

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 caffeine depending upon the steeping time from 1 to 5 minutes. Caffeine consumption for adults should be between 120 mg per day or 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 component 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 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 decrease serum and liver lipid. thus drinking oolong tea helps in controlling diabetes and 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 were done on athletes shows that oolong tea decreases the oxidative stress and lipid peroxidation level (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 helps in Lowering the  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’s stimulation excites the brain and central nervous system.

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 manufacture because of disturbed iron bioavailability resulting in anemia. 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, and 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 make the stomach upset.

3. Inhibits iron absorption

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


  1. I seldom create remarks, but after reading a bunch of remarks on Oolong
    Tea Health Benefits & Side effects –
    I actually do have 2 questions for you if you do not mind.

    Could it be just me or do some of these responses come across
    like they are coming from brain dead individuals?

    😛 And, if you are writing at other places, I would like to follow anything fresh you have to post.

Comments are closed.