Standardized capsule of Camellia sinensis [green tea extract] lowers cardiovascular risk factors in a randomized, double-blind, placebo-controlled study – Source: Nutrition, Oct 8, 2008

Objective: Previous studies examining the effect of tea drinking on cardiovascular health have produced mixed results due to their observational nature and qualitatively and quantitatively imprecise definitions of active tea components.

The objective of this study was to determine if a standardized and defined decaffeinated green tea (Camellia sinensis) product lowers blood pressure, serum lipids, oxidative stress, and markers of chronic inflammation.

Methods: A randomized, double-blind, placebo-controlled, parallel study on 111 healthy adult volunteers 21 to 70 years old was performed. We administered a standardized capsule of Camellia sinensis compounds (CSC) twice a day. Before and after 3 weeks, blood pressure, serum lipids, serum amyloid-beta (a marker of chronic inflammation), and serum malondialdehyde (a marker of oxidative stress) were measured.


• After 3 weeks, CSC lowered systolic and diastolic blood pressures by 5 and 4 mmHg, respectively.

• After 3 months, systolic blood pressure remained significantly lower.

• CSC lowered serum amyloid-beta by 42%…

• And lowered malondialdehyde by 11.9%.

• In men, there were 10- and 9-mg/dL reductions in total and low-density lipoprotein (LDL) cholesterol, respectively.

• In all subjects with a baseline LDL cholesterol level [more than] >99 mg/dL, there was 9 mg/dL lowering of total and LDL cholesterol. [LDL is termed “bad” cholesterol.]

• Adverse effects were mild and few and not different from placebo.

Conclusion: CSC was effective for decreasing, in as quickly as 3 weeks, blood pressure, LDL cholesterol, oxidative stress, and a marker of chronic inflammation, all independent cardiovascular risk factors.

Source: Nutrition, Oct 8, 2008. E-pub ahead of print, PMID: 18848434, by Nantz MP, Rowe CA, Bukowski JF, Percival SS. Food Science and Human Nutrition Department, University of Florida, Gainesville, Florida; Brigham and Women’s Hospital, Harvard Medical School, Nutritional Science Research Institute, Boston, Massachusetts, USA. [E-mail:]

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