December 04, 2009

What green tea can and cannot do for your skin.

Skin benefits of green tea

There have been a number of encouraging studies of skin benefits of green tea. Animal studies showed protection from skin cancer. Both animal and human studies have credibly demonstrated that topical green tea formulations reduce sun damage. Green tea appears to exert sun damage protection by quenching free radicals and reducing inflammation rather than by blocking UV rays. Therefore, green tea may synergistically enhance sun protection when used in addition to a sunscreen.

A small study showed benefits of 2% polyphenone (via a particular type of green tea extract) in papulopustular rosacea. In particular, a significant reduction in inflammatory lesion was reported compared to placebo.

What about wrinkles, skin sag and other signs of aging? Can green tea help? Considering their well-documented antioxidant and anti-inflammatory activities, topical green tea polyphenols are likely to slow down the development of some signs of aging. Whether green tea can actually diminish wrinkles and skin sag is far more uncertain. In a 2005 study, forty women with moderate photoaging were randomized to either a combination regimen of 10% green tea cream and 300 mg twice-daily green tea oral supplementation or a placebo regimen for 8 weeks. No significant differences in clinical grading were found between the green tea-treated and placebo groups. On the other hand, histologic grading of skin biopsies did show significant improvement in the elastic tissue content of treated specimens. More human studies are needed to not only determine the scope of anti-aging skin benefits of green tea but also to work out the optimal usage.

How to use green tea in your skin care

Some uncertainty regarding the extent of green tea benefits and its optimal usage is likely to remain for years to come. Yet, if you wish to include green tea in your skin care today, there are sensible ways to go about it.

In particular, since sun protection benefits of green tea are particularly well documented, it could make sense to apply a green tea formula under your sunscreen when venturing into the sun. It is best to combine green tea with zinc oxide-based sunscreens because zinc oxide is chemically inert and should not react with green tea (which some chemical sunscreens might do, especially in sunlight).

It may also be useful to incorporate green tea into your skin maintenance routine to possibly slow down skin aging. However, simply buying a green tea cream may not necessarily be the best way to go. Like most other antioxidants, green tea polyphenols are oxidized and lose their activity when exposed to air. Whether commercial green tea creams retain the activity is unclear and may vary widely from product to product.

If you are willing to put in a bit of extra effort, here is some alternatives. Freeze freshly brewed green tea as ice cubes and use them as a toner. (Just don't apply ice cubes to your skin right out of the freezer, let them start thawing first or you may get a freeze burn.) Or you can make your own fresh green tea cream using standardized extract as an active ingredient

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