
Green Tea
Green tea consumption has been associated in population studies reviewed below with a decreased risk of cancer in humans. This evidence is particularly strong for gastric cancer, where studies in China have demonstrated that both gastritis, the inflammatory condition that precedes gastric cancer, and gastric cancer are inversely associated with green tea intake
A Summary of the Evidence
Guarana
In a study reported in The Journal of Human Nutrition and Dietetics, guarana extract induced weight loss for over 45 days in overweight patients taking a mixed herbal preparation containing yerbemate, guarana, and damiana (Andersen et al. 2001). Body weight reductions were 11.22 pounds in the guarana group compared to less than 1 pound in the group receiving placebo for 45 days:
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Ginseng
Ancient healers in India, Russia, China and Japan all revered ginseng for its medicinal and health-enhancing properties. In traditional Chinese medicine (TCM), ginseng is used for many purposes, including normalizing blood pressure and blood sugar, as a sexual tonic for both men and women, and to strengthen overall health when the body is debilitated.
Ginseng is an adaptogen, an herb that can improve the body's overall ability to adapt to and cope with the negative effects of physical and environmental stress. Clinical studies confirm that ginseng can help enhance endurance, reduce fatigue, and improve coordination and reaction time. There is also some evidence that ginseng can boost immune function, helping the body fight off infection during times of stress. In laboratory studies, ginseng has shown potential in protecting liver and heart health, regulating the function of reproductive hormones, normalizing cholesterol and blood sugar levels, and improving memory and learning. Studies in humans are needed to investigate the effectiveness of ginseng in these promising areas.
Ginseng is considered "energizing," but has not been shown to stimulate the central nervous system the way coffee does. People taking ginseng often report feelings of improved overall well-being.
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Arginine
Oral L-Arginine Improves Hemodynamic Responses to Stress and Reduces Plasma Homocysteine in Hypercholesterolemic Men
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