It also contains less caffeine, making it a lighter choice for daily consumption. 1) Boosts Metabolism – Green tea can increase fat burning and promote a more efficient metabolism due to its catechins and caffeine content. Studies show that green tea extract can help burn 3-4% more calories over the course of the day. Another concern lies with tannins, or natural compounds in green tea that contribute to its slightly bitter taste. Tannins can bind to minerals like iron, making them harder for your body to absorb. This effect is particularly important for those who rely on plant-based sources of iron, as it may increase the risk of iron deficiency over time.

How Much Caffeine Is in a Mocha? 2026 Breakdown

Additionally, tannins may increase stomach acid and cause nausea or digestive discomfort, especially if you drink green tea on an empty stomach. And in some cases, consuming a lot of tannins may reduce saliva production, leading to a condition known as xerostomia (dry mouth). However, it can occasionally cause liver damage in people with a certain gene variant.

Iron

Skip high-dose extracts unless a clinician has a clear reason for them and your meds have been checked for conflicts. If you define cure as “end the underlying condition,” green tea is not a cure. No beverage replaces diagnosis, treatment, and long-term risk control. Life circumstances change, and so might your ideal green tea intake.

Birth control pills (Contraceptive drugs) interacts with Green Tea

Taking green tea along with fluvoxamine (Luvox) might cause too much caffeine in the body, and increase the effects and side effects of caffeine. Cimetidine (Tagamet) can decrease how quickly your body breaks down caffeine. Taking cimetidine (Tagamet) along with green tea might increase the chance of caffeine side effects including jitteriness, headache, fast heartbeat, and others.

Ginseng in Food

If you’re sensitive to caffeine, consider limiting your green tea intake significantly. Other preliminary studies suggest that green tea polyphenols and EGCG applied to the skin reduced skin inflammation. The body breaks down the caffeine in green tea to get rid of it. Terbinafine (Lamisil) can decrease how fast the body gets rid of caffeine. Taking green tea along with terbinafine (Lamisil) can increase the risk of caffeine side effects including jitteriness, headache, increased heartbeat, and other effects.

If you suffer from any illnesses that predispose you to side effects, consult with your physician before drinking green tea. Excess consumption of green tea increases the risk of bone disease such as osteoporosis in sensitive individuals. Compounds in green tea inhibit the absorption of calcium, resulting in a deterioration of bone health (15). Limit your intake to 2 to 3 cups of green tea if you are predisposed to bone disease.

Reduced Iron Absorption

10) Promotes Skin Health – The polyphenols in green tea can help protect the skin from UV radiation and prevent premature aging caused by environmental damage. Green tea may cause stomach irritation when brewed too strongly or consumed on an empty stomach (1). Green tea contains tannins that can increase the amount of acid in your stomach. Excess acid can lead to digestive issues including constipation, acid reflux, and nausea. Brewing green tea with water that is too hot can exacerbate these side effects. This article delves into the possible adverse effects of green tea, providing a comprehensive understanding for those who wish to make informed decisions about their consumption.

Green tea is one of the most popular beverages worldwide, particularly valued for its delicate flavor and the numerous health benefits it offers. It is made from the leaves of the Camellia sinensis plant, the same plant used to produce black tea and oolong tea. However, unlike black and oolong tea, which undergo extensive oxidation, green tea leaves are quickly processed by steaming or pan-frying to prevent oxidation. This minimal processing helps preserve the natural antioxidants and polyphenols in the leaves, which contribute significantly to green tea’s health benefits.

While it’s essential to be mindful of caffeine content and potential side effects, incorporating green tea into a balanced lifestyle can be a flavorful and health-conscious choice. It’s important to add that these L-theanine side effects are relatively uncommon and tend to be mild. In addition, if you’re pregnant or breastfeeding, you should also exercise caution when taking L-theanine, as there’s limited research on its safety in these populations. Stimulant drugs speed up the nervous system and can make you feel jittery and speed up your heartbeat. Green tea contains caffeine, which can also speed up the nervous system. The caffeine in green tea might block the affectseffects of dipyridamole (Persantine).

Fenugreek: What Is It and Is It Healthy?

With its distinct sour taste, it’s not only a favorite drink across the globe but also revered for its medicinal properties. Hidden sugars lurk in breakfast foods Americans think are healthy, warns Dr. Mark Hyman. From muffins to protein cereals, he shares what’s harmful and what to choose instead. These supplements may not be safe to take with certain medications, including those used to treat chest pain. There aren’t many studies on NAC and the immune system, but current research suggests that it and glutathione may help to improve immune function in people with HIV.

Natural Caffeine Content

3) Iron Absorption – Green tea can inhibit the absorption of non-heme iron from plant-based sources, potentially leading to iron deficiency in susceptible individuals. 18) Improves Respiratory Health – Green tea’s anti-inflammatory properties may help alleviate symptoms of asthma and other respiratory conditions. Green tea is primarily grown in East Asia, particularly in China, Japan, and Korea, though it is now cultivated worldwide. It has deep roots in traditional medicine, particularly in Chinese and Japanese cultures, where it has been consumed for over a thousand years. Green tea intolerance symptoms include headaches, dizziness, and stomach upset, usually due to sensitivity to caffeine or tannins. If you notice your tea habit is making you feel jittery or nervous, it could be a sign you have had too much and may want to cut back to reduce symptoms.

Is EGCG Bad for the Liver? Understanding Green Tea Extract Safety

The authors suggest daily green tea supplementation may benefit working memory. A 2022 review suggests green tea catechins have anti-inflammatory properties that target free radicals and protect heart health. A 2020 database review of epidemiological and experimental studies in humans produced inconsistent results and limited evidence of green tea’s benefits for lowering cancer risk.

• Our stringent editorial guidelines allow us to only cite from reputed research institutions, academic journals, and medically established studies.
• Research highlights the anti-inflammatory effects of green tea.
• Green tea is not fermented and is produced by steaming fresh leaves at high temperatures.
• One study found that the lung function of guinea pigs improved after researchers gave them a moringa extract.
• Research shows that caffeine inhibits the metabolism of Warfarin.
• Drinking green tea might protect against cardiovascular diseases, lowering the risk of heart attack and stroke.

The topical application of green tea polyphenol extracts may have a role in protecting the skin from UVB radiation. A 2018 review of in vitro, in vivo, and human studies demonstrated the potential benefits of tea polyphenols in the chemoprevention of UVB-induced skin cancer. In countries with high green tea consumption, some cancer rates tend to be lower. However, human studies have not shown consistent evidence that drinking green tea reduces the overall risk of cancer. Tannins, caffeine, and tea catechins have all been linked to increased risks during pregnancy. Experts say that green tea in small amounts — no more than 2 cups per day — is safe during pregnancy and breastfeeding.

Science & Tech

Green tea might interact with some medications used to treat cancer (boronic acid-based proteasome inhibitors). This might decrease its effectiveness of these medications for treating certain types of cancer. If you take is unimeal legit one of these medications for cancer, avoid taking green tea products. Taking green tea along with medications that also slow clotting might increase the chances of bruising and bleeding. The body breaks down clozapine (Clozaril) to get rid of it.