The combination of these two substances may even be synergistic, as one study found that people who ingested L-theanine and caffeine together had better attention than when either was used alone ( 14, 16). L-theanine is thought to balance the effects of caffeine. L-theanine is thought to cross the blood-brain barrier and trigger the release of an inhibitory neurotransmitter in the brain called gamma-aminobutyric acid (GABA), which brings about a relaxed but alert state ( 12, 13, 14).Īt the same time, it promotes the release of the mood-enhancing hormones dopamine and serotonin ( 15). Green and black teas also contain the amino acid L-theanine, which is not present in coffee. It also aids the release of mood-enhancing neurotransmitters like dopamine and serotonin ( 10, 11).Īs a result, caffeine can boost alertness, mood, vigilance, reaction time, and short-term recall ( 9).
Green tea contains less caffeine than black tea - about 35 mg per 8-ounce (230-ml) cup, compared with 39–109 mg for the same serving of black tea ( 2, 8, 9).Ĭaffeine stimulates your nervous system by blocking the inhibitory neurotransmitter adenosine. Green and black tea both contain caffeine, a known stimulant. Similarly, drinking at least 3 cups of black tea could reduce your risk of heart disease by 11% ( 2). What’s more, two reviews examining over 10 quality studies each found that drinking green and black tea can lower your blood pressure ( 5, 6).įurthermore, another review of green tea studies found that people who drank 1–3 cups per day had a 19% and 36% reduced risk of heart attack and stroke respectively, compared with those who had less than 1 cup of green tea each day ( 7). The study also found that both types of tea helped reduce LDL (bad) cholesterol and triglycerides ( 4). One animal study found that green and black tea were equally effective at preventing blood vessel plaque formation by 26% at the lowest dose and up to 68% at the highest dose ( 4). The flavonoids in green and black tea are thought to protect your heart ( 2, 3). For example, green tea contains a much higher amount of epigallocatechin-3-gallate (EGCG), whereas black tea is a rich source of theaflavins ( 2). However, the type and amount of flavonoids they contain differ. Specifically, they contain flavonoids, a subgroup of polyphenols. Can protect your heartīoth green and black tea are rich in a group of protective antioxidants called polyphenols. While green and black tea differ, they may provide some of the same health benefits.
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