Liver problems have been reported in a small number of people who took concentrated green tea extracts. Although the evidence that the green tea products caused the liver problems is not conclusive, experts suggest that concentrated green tea extracts be taken with food and that people discontinue use and consult a health care provider if they have a liver disorder or develop symptoms of liver trouble, such as abdominal pain, dark urine, or jaundice.

Sencha: Sencha comes from the same plant, but in this green tea variation, the leaves are from the middle of the branch and are bigger, older, and less tender than Gyokurocha. This variety gives a clear, light green tea when brewed as well. Naturally, it is more bitter and stronger than the former variety. Being of less noble origin (middle of the branch) and having more caffeine and tannin, it is cheaper and more popular than Gyokurocha.
An animal study published in 2009 in “Phytomedicine” found that green rooibos tea helped regulate glucose metabolism, preventing increases in fasting blood glucose levels during the course of the five-week study. This effect is a result of aspalathin, a compound found in green rooibos. Poor glucose tolerance and high fasting glucose levels are signs of type-2 diabetes and are common in obesity. The study suggests rooibos tea may help keep blood glucose levels in check, preventing sharp spikes and falls that can trigger symptoms of hunger and possibly leading to lower calorie consumption.

Jump up ^ Serban C, Sahebkar A, Antal D, Ursoniu S, Banach M (September 2015). "Effects of supplementation with green tea catechins on plasma C-reactive protein concentrations: A systematic review and meta-analysis of randomized controlled trials". Nutrition (Systematic review & meta-analysis). 31 (9): 1061–71. doi:10.1016/j.nut.2015.02.004. PMID 26233863.
Still, there have been some interesting findings. A 2014 study looked at 25 randomized controlled trials on the link between tea and blood pressure and reported that when people drank tea—especially green tea—for 12 weeks, their blood pressure dropped significantly. A 2011 study reported that drinking green tea appeared to be linked with lower levels of bad LDL cholesterol, but more research is needed. Because matcha is a type of green tea, they may share similar benefits, but there’s not enough research to make that claim.
^ Jump up to: a b c "Scientific Opinion on the substantiation of health claims related to Camellia sinensis (L.) Kuntze (tea), including catechins in green tea, and improvement of endothelium-dependent vasodilation (ID 1106, 1310), maintenance of normal blood pressure (ID 1310, 2657), maintenance of normal blood glucose concentrations (ID 1108), maintenance of normal blood LDL cholesterol concentrations (ID 2640), protection of the skin from UV-induced (including photo-oxidative) damage (ID 1110, 1119), protection of DNA from oxidative damage (ID 1120, 1121), protection of lipids from oxidative damage (ID 1275), contribution to normal cognitive function (ID 1117, 2812), "cardiovascular system" (ID 2814), "invigoration of the body" (ID 1274, 3280), decreasing potentially pathogenic gastro-intestinal microorganisms (ID 1118), "immune health" (ID 1273) and "mouth" (ID 2813) pursuant to Article 13(1) of Regulation (EC) No 1924/2006". European Food Safety Authority. 8 April 2011. Retrieved 9 November 2014.
The rooibos plant is endemic to a small part of the western coast of the Western Cape province of South Africa. It grows in a symbiotic relationship with local micro-organisms. Scientists speculate that climate change may threaten the future survival of the plant and the R600-million (approximately €43-million in March 2017) rooibos industry. Some claim that increasing temperatures and decreasing rainfall may result in the extinction of the plant within the next century.[15]
Like black and green tea, rooibos is rich in polyphenols, such as rutin and quercetin. Cell and animal studies, mostly from South Africa, have shown that rooibos extracts have antioxidant, immune-stimulating, and anti-cancer properties. But studies of rooibos tea in people are limited. There’s little or no evidence to back claims that it relieves constipation, headaches, eczema, asthma, insomnia, high blood pressure, mild depression, ulcers, diabetes, and so on.
Basically, tea time may not be for you. I know we all want “quick results,” but instead a gradual change in diet is best. Since my last tea scare, I’ve actually gotten accustomed to simply eating better. Stuff like eliminating dairy has helped with my “fupa” (lower belly pudge), and overall bloat. Limiting my red meat intake has also helped. Leaner meats like turkey, chicken breast and egg whites have helped me keep inches off and feel more energized.

Studies on green tea’s impact on cancer have been mixed. But green tea is known to aid healthy cells in all stages of growth. There are some clues that green tea may help destroy cancer cells, but that research is still in its early stages, so you shouldn’t count on green tea to prevent cancer. In fact, the National Cancer Institute's web site says it "does not recommend for or against the use of tea to reduce the risk of any type of cancer."

Day 14: At halfway through my detox, I finally officially figured out what works for me and my body. The plan: my standard first-thing-in-morning cup of coffee, then an iced version of the tea to drink with me throughout the day. I sip it all day long, and it’s both refreshing and hydrating. I can very honestly say I feel AWESOME. I’m having no kinds of digestive problems, I feel lighter while running at the gym, and my stomach is significantly less bloated and more toned.
But matcha didn’t skyrocket to celeb status on health merits alone. As we said back in 2011, wheatgrass is healthy, too, but we’re not seeing it in every other bakery and café. Matcha has flavor going for it—grassy, pleasantly vegetal, and slightly bitter—and a brilliant natural color that makes baked goods (like rainbow cookies) stand out from the crowd in busy bakeries (and on Instagram).
I'll be the first to admit I am NO matcha tea expert. However, I do enjoy this tea a lot. It has a very green, planty taste kind of. It is a lot stronger than something like generic green tea bags from different brands I have tried. I use a tiny whisk to stir it up in hot water and drink. There are some grains at the bottom of the cup that I drink, but it isn't as crazy as greek coffee or anything like that with a thick sludge at the bottom. I like that this gives me the benefits of green tea without having to down as many cups of it, because the matcha is much more potent.
Every day, countless people throw away valuable antioxidants and minerals. While seemingly unimaginable, that’s exactly what happens when you brew a cup of green tea because water can only extract a fraction of green teas benefits. The majority actually remains unused, trapped in the tea leaves. In reality, the only way to truly take advantage of green teas full potential is to consume the entire leaf. But that doesn’t mean you need to start eating tea leaves. The simplest solution is to just enjoy a bowl of matcha. Because matcha is straight, stoneground tea leaves, matcha provides you with green teas powerful arsenal of vitamins, minerals, antioxidants, and amino acids in a way no other green tea can.
Along with caffeine, which gives green tea its characteristic taste, bitterness, and stimulating effect, green tea is also rich in a group of chemicals, called catechin polyphenols (commonly known as tannins, which contribute to bitter taste and astringency). These catechin polyphenols include catechin, epicatechin, epicatechin gallate (ECG), epigallocatechin gallate (EGCG), and various proanthocyanidins. They are also known as flavonoids and are very powerful antioxidants. Flavonoids, together with some amino acids like thiamine, are responsible for the potent flavor of green tea.
Because matcha is made from high-quality tea, and the whole leaves are ingested, it’s a more potent source of nutrients than steeped green tea. In addition to providing small amounts of vitamins and minerals, matcha is rich in antioxidants called polyphenols, which have been tied to protection against heart disease and cancer, as well as better blood sugar regulation, blood pressure reduction, and anti-aging. Another polyphenol in matcha called EGCG has been shown in research to boost metabolism, and slow or halt the growth of cancer cells.
I'm a mom of two boys and live in Larkspur, CA, but still call South Africa my home. I grew up (literally) with Rooibos Tea: a naturally caffeine free beverage that has been used by generations of South Africans for anything from a delicious anytime drink, to a soothing beverage to calm Baby's colic, to putting in the bath for dry & flaky skin. You name it, Rooibos is the cure. 
Matcha typically has more caffeine content than green tea, similar caffeine to black tea, and less caffeine than brewed coffee. Because matcha is produced from shade-grown tea bushes, the tea leaves tend to retain more of their caffeine content. In addition, since you’re consuming the ground tea leaf when sipping matcha, you’re ingesting more caffeine content than you would from the extraction of steeped green or black tea leaves. Like all drinks cultivated from caffeinated plants, however, a specific level of caffeine per cup of matcha tea will depend on the how the matcha was processed and prepared. Be sure and read the packaging carefully or ask your tea supplier directly for the caffeine information specific to the matcha you are buying.
Researchers from the Netherlands confirmed in a recent study that two green tea compounds, L-theanine and caffeine, can significantly boost levels of attention and alertness, building on what is already known about the brain benefits of green tea. The drink is less likely to make you jittery and anxious than other energy-boosting drinks, because it contains lower levels of caffeine than other teas or coffee. In another study published in the American Journal of Clinical Nutrition, researchers discovered that drinking just one cup of green tea a day made people age 55 and older 38 percent less likely to experience a decline in their mental abilities. Drinking a second cup daily made them 54 percent less likely to show mental declines.
56. For the next 100 days, practice active listening. When someone is talking to you, remain focused on what they’re saying, instead of rehearsing in your head what you’re going to say next. Paraphrase what you think you heard them say to make sure that you haven’t misinterpreted them, and encourage them to elaborate on any points you’re still not clear about.
On this episode of Consumed, host and Eater Drinks editor Kat Odell looks into the matcha production process — how it differs from that of more traditional steeped green tea, and how two of New York's noted matcha purveyors (Ippodo Tea Company and Matchabar) are working with the product today. Watch the video above for a lesson in powdered green tea; if your interest is piqued, check this map for the best places to drink matcha across the country, and these recipes for making iced matcha drinks at home, perfect for the summer.
The South African Department of Trade and Industry issued final rules on 6 September 2013 that protects and restricts the use of the names "rooibos", "red bush", "rooibostee", "rooibos tea", "rooitee" and "rooibosch" in that country, so that the name cannot be used for things not derived from the Aspalathus linearis plant. It also provides guidance and restrictions for how products which include Rooibos, and in what measures, should use the name "rooibos" in their branding.[14]
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I never told anyone this, and by now, you’re probably thinking I’m a fool. But can I just say that I actually thought if I followed the commenters (about how long to steep) that I’d be ok? Man, listen. The same thing happened again. Exactly as it happened before, except it actually made me vomit! Thank God ever since the first incident, I keep alcohol in my medicine cabinet and I always take my phone to the restroom. I sniffed it quick as I felt a blackout coming on. The smell allowed me to hang on to the edge of consciousness. However, with only enough strength to pull the Emergency Call screen up on my phone, I thought for sure that I was going to go out in the bathroom, Elvis Presely style. Was this my punishment for being so vain?
This best-selling detox tea has a loyal following, with thousands of reviewers claiming that it helped with excess bloating, daily digestive issues, and ultimately contributed to weight loss when consumed alongside a balanced diet and regular exercise. Made with green tea leaf, matcha green tea, and guarana seed, this tea blend is quite caffeinated — so don't sip it before bedtime. 
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Matcha is loaded with a rare and powerful group of natural polyphenol antioxidants called Catechins that work to prevent oxidative damage to cells and reduce your risk of cancer* (1). According to the National Cancer Institute, the catechins in Matcha green tea are so powerful that they may actually reduce the risk of cancer, making Matcha green tea one of the top natural cancer treatment options out there.* (2)
The next morning, I had a bagel and one daily tea, as instructed. I felt my stomach become uneasy as most stomachs do when they’re working their “digestive magic.” Suddenly, the worst cramp of my life hit me out of nowhere. It was the sharpest PANG I’ve ever felt as it made its way from my stomach to my chest. As a reflex, I jumped up. That’s when I felt another wave of pain and swiftly made my way to the restroom.

You can make African red tea much like other herbal teas, according to Teavana. Add a 1 1/2 teaspoons of loose African red tea to make an 8-ounce serving, using boiling water. Allow the tea to steep for roughly five to six minutes, longer if you wish for a stronger tasting tea. Letting the tea steep for longer will not cause the tea to become bitter. Indeed, traditionally, African red tea has been allowed to steep for several days. If you want to make chilled African red tea, you can place the hot tea in the fridge to let it cool. Alternatively, double the amount of tea used and then pour the hot tea over a glass filled with ice cubes. 
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