Laboratory studies (performed with animals or with cells) suggest that green tea could slow the growth of some types of cancer cells, but human studies have shown mixed results.
Does Green Tea Work for Genital Warts?
There is an FDA-approved prescription ointment (Veregen™) made with a green tea extract that is approved to treat external genital and perianal warts. This product can help treat genital and perianal warts but does not prevent the warts from coming back.
There is no evidence that taking green tea by mouth can help treat genital warts.
Does Green Tea Work for Weight Loss?
Many of the green tea supplements currently available are marketed as weight loss supplements. One very preliminary study suggested that a specific green tea extract could lower weight by 4.6 percent (after three months of use) in moderately obese people. However, a more carefully designed study showed that green tea extract does not help people who have lost weight keep the weight off. At this point, there is not enough scientific evidence to suggest that green tea really works for weight loss. It is possible that some people may lose a little weight (often "water" weight) due to the caffeine content of green tea.
Final Thoughts on Green Tea Effectiveness
Green tea shows promise for treating or preventing a variety of different medical conditions. However, it is not free of side effects (see Green Tea Side Effects) and drug interactions (see Green Tea Drug Interactions), and much more research is needed to verify that green tea really does work for most uses.
Written by/reviewed by: Kristi Monson, PharmD;Arthur Schoenstadt, MD
Last reviewed by: KristiMonson, PharmD;
List of references (click here):
Jellin JM, editor. Pharmacist's Letter/Prescriber's Letter Natural Medicines Comprehensive Database Web site. Available at: http://naturaldatabase.com/. Accessed January 31, 2008.
National Center for Complimentary and Alternative Medicine. National Institutes of Health. Herbs at a glance: green tea (May 2006). NCCAM Web site. http://nccam.nih.gov/health/greentea/. Accessed January 31, 2008.
Chantre P, Lairon D. Recent findings of green tea extract AR25 (Exolise) and its activity for the treatment of obesity. Phytomedicine 2002; 9(1): 3-8.
Kovacs EM, Lejeune MP, Nijs I, Westerterp-Plantenga MS. Effects of green tea on weight maintenance after body-weight loss. Br J Nutr 2004;91:431-7
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