Black, green, white, and Oolong tea are the four main types of non-herbal teas. They all come from the Camellia Sinensis plant people consider them real tea.

While it’s one of the healthiest drinks out there, green tea still carries side effects. The beverage contains caffeine, so drinking too much, especially before bedtime, can lead to disturbed sleep, anxiety and headaches. Drinking too much green tea can also affect how your body absorbs iron.

Side effects and risks Caffeine sensitivity: People with severe caffeine sensitivities could experience insomnia, anxiety, irritability, nausea, or an upset stomach after drinking green tea. Liver damage: Consuming a high concentration of green tea extract may negatively impact liver health in rare cases.

Can Tea Be Bad for Your Health? Most teas are benign, but the FDA has issued warnings about so-called dieter’s teas that contain senna, aloe, buckthorn, and other plant-derived laxatives. The agency also warns consumers to be wary of herb-containing supplements that claim to kill pain and fight cancer.

Flickr/bopeepo Green tea is the healthiest beverage on the planet. It is loaded with antioxidants and nutrients that have powerful effects on the body. This includes improved brain function, fat loss, a lower risk of cancer and many other incredible benefits.

Green tea may create problems if you’re taking stimulants, hormones, antibiotics, blood thinners, certain asthma medications or any drug that poses a risk of liver damage. Green tea can also worsen diarrhea, glaucoma, bleeding disorders and multiple other conditions.

Green tea is generally good for the cardiovascular system. It helps balance out your blood pressure by lowering it if you have high blood pressure. It also improves the flow of the blood in your veins. Plus, it helps prevent heart-related ailments and issues.

Green tea can reduce the risk of cardiovascular diseases. When you drink green tea on a daily basis, your body gets the reward. Though green tea contains caffeine, that doesn’t mean it’s bad for your or your heart health. In fact, it is actually good for your heart.

Research suggests that by taking green tea at night, you can ensure a speedy metabolism. With a proper amount of sleep, you can improve your body’s metabolism and provide a healthy body. According to studies from the American Journal of Clinical Nutrition, Green tea can increase the fat-burning metabolism by up to 4%.