Teas are not in Caffeine Contained

Caffeine is a xanthine alkaloid compound that acts as a stimulant in humans. Caffeine is called theine when found in tea .Overall, caffeine is found in the beans , leaves , and fruit of over 60 plants , where it acts as a natural pesticide that paralyzes and kills certain insects feeding on the plants. Caffeine is a central nervous system (CNS) stimulant , having the effect of temporarily warding off drowsiness and restoring alertness. Beverages containing caffeine, such as coffee , tea , soft drinks and energy drinks enjoy great popularity; caffeine is the world's most widely consumed psychoactive substance , but unlike most other psychoactive substances, it is legal and unregulated in nearly all jurisdictions. In North America, 90% of adults consume caffeine daily. The U.S. Food and Drug Administration lists caffeine as a "Multiple Purpose GRAS (Generally Recognized As Safe) Food Substance". Many natural sources of caffeine also contain widely varying mixtures of other xanthine alkaloids , including the cardiac stimulants theophylline and theobromine and other substances such as polyphenols which can form insoluble complexes with caffeine.

		matic name	1,3,7-trimethyl-1 H -purine-2,6(3 H ,7 H )-dione
		Other names	1,3,7-trimethylxanthine, trimethylxanthine, theine, mateine, guaranine, methyltheobromine
		Molecular formula	C8 H10 N4O2
		SMILES	O=C1C2=C(N=CN2C)N(C(=O)N1C)C
		Molar mass	194.19 g·mol -1
		Appearance	Odorless, white needles or powder

Content

Tea contains catechins , a type of antioxidant . In fresh tea leaf, catechins can be up to 30% of the dry weight. Catechins are highest in concentration in white and green teas while black tea has substantially less due to its oxidative preparation. Tea contains the stimulant caffeine at about 3% of its dry weight, translating to between 30mg and 90mg per 8oz (or 0.25 L) cup depending on type and brand and brewing method. Tea also contains small amounts of theobromine and theophylline . Tea also contains fluoride , with certain types of brick tea made from old leaves and stems having the highest levels. Regular drinking of tea can prevent dental cavity to some extent . However, excessive consumption of tea (brick tea in particular) has led to cases of fluorosis. Finally, as a dried plant, tea preserves some vitamins and played an important role in keeping Chinese sailors' health in history, such as the voyage led by Zheng He

How Much Caffeine Is in Tea?

True tea is made from the leaves of an Asian evergreen known as Camellia sinensis . White tea, green tea, oolong tea, and black tea all come from this plant, and all contain caffeine. Researchers believe that in plants, caffeine works as a natural defense system to deter insects and other herbivores with the compound's bitter taste and stimulating qualities. And, not so surprisingly, it's the vulnerable, growing buds and young leaves of tea plants that manufacture the highest amounts of caffeine. Many factors influence how much caffeine is present in plucked tea leaves. These include the growing region, plant varietal, plant age, leaf age, length of the growing season, field conditions, soil nutrients, rainfall, and stress by pests. Final caffeine content may be further affected during production of the leaves into the finished “style” (white, green, etc). How the tea is actually prepared plays an important role in how much caffeine makes it into your cup. Everything, from the amount of tea used to water temperature and brewing time to whether the leaves are steeped loose, in a tea bag, or strainer, becomes a factor. In general, though, more tea, hotter water, and longer steeping all contribute to more caffeine per cup. Given all of these variables, it really is difficult to answer the question, “How much caffeine is in this tea?” Because we know that caffeine is a concern, we offer these general ranges based on some of our products. Please keep in mind that these numbers reflect varying steeping times and amounts of tea leaves per cup.

Beverage	Caffeine Per 8 oz Cup
White Tea	30-55 mg
Green Tea	35-70 mg
Oolong Tea	50-75 mg
Black Tea	60-90 mg
Coffee	150-200 mg

Our decaffeination process uses carbon dioxide naturally present in the air around us to remove caffeine from the tea leaves. For those who must avoid caffeine , we recommend our The Tea Nation Tea. (It's important to keep in mind that decaffeinated tea is not caffeine-free, and a trace amount of 2-4 mg per cup remains)

A Thought About Serving Sizes

Caffeine levels are often reported in terms of mg per 8 oz cup, but people seldom drink only 8 oz of tea or coffee. Trying to relate reported caffeine to actual personal consumption doesn't always give an accurate comparison.Why?

If an 8 oz cup of brewed coffee contains 150 mg of caffeine, a 16 oz cup of coffee will have 300 mg. Similarly, when you drink an 8 oz cup of tea served from a brewed pot of tea, doubling the serving size to 16 oz results in double the caffeine.But steeping tea in a mug is different. If you were to brew a mug of tea using 8 oz of water and one tea bag, the total caffeine could be around 40 mg. If you were to brew a larger mug of tea using 16 oz water and one tea bag, the total caffeine would not double. It would still be only around 40 mg!