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The Official Journal of the Pan-Pacific Association of Input-Output Studies (PAPAIOS)

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Table 1 Tea components and their major effects on human health (Sakamoto et al. 2012; Nihon 2014)

From: The growth of the Japanese black tea market: how technological innovation affects the development of a new market

Component Content Effect
Min Max
Tannin 8.4% 18.2% Antioxidant, antibacterial effect, decreases blood cholesterol, cancer prevention effect, inhibits high blood pressure, antibacterial effect, deodorizing antiallergic, Inhibition of blood sugar level
Caffeine 2.6% 3.9% Awakening effect, cardiac effect, stress relief, recovery from fatigue, anti-asthmatic, diuresis
Amino acids 1.20% 2.40%  
 Glutamic acid 43 mg% 136.7 mg% Detoxification action on ammonia, diuresis, inhibits high blood pressure
 Theanine 199.6 mg% 809.3 mg% Control of cerebral neurotransmitter, protection of nerve cells
 γ-aminobutyric acid 11.4 mg% 66.1 mg% Anti-stress, improvement in brain function, inhibits high blood pressure