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Caffeine Blood Pressure Research

caffeine blood pressure research

Caffeine blood pressure research

Most studies of green tea and heart disease risk factors such as high blood pressure, high cholesterol, and strokes have used either green tea or black tea.

Now a new study compares a standardized decaffeinated green tea extract capsule with placebo.

Researchers in Florida examined 111 healthy adults, age 21-70, over 3 months for blood pressure, blood cholesterol, serum oxidative stress, and inflammatory markers.

The volunteers took two decaf green tea extract capsules twice a day or placebo twice a day in the double-blind study.

Within the first 3 weeks, the green tea participants showed lower blood pressure in both systolic and diastolic measurements.

Decaf green tea lowers blood pressure

By three months, this caffeine blood pressure study showed that systolic blood pressure remained significantly lower for the green tea group.

Also total cholesterol was lower, oxidative stress was lower, and the inflammatory blood marker was lower for the green tea group after 3 months.

In general, most studies have shown that caffeine enhances green tea benefits.

But this study supports potential cardiovascular risk reduction even with decaf green tea for those who might be sensitive to caffeine (Nantz MP, Standardized capsule of Camellia sinensis lowers cardiovascular risk factors in a randomized, double-blind, placebo-controlled study, Nutrition, October 2008).

That's great news for people who choose decaf green tea.

Related articles

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Which green tea has more caffeine?

How to choose your own level

21 tips to reduce (or increase!) caffeine in green tea

What about decaffeinated green tea?

Positive and negative effects

What are dangerous levels?

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