I've got some reading material for you guys. This is the report from a 2010 study that used a 3% green tea cream on the faces of testers for 8 weeks. By week 8 they showed ON AVERAGE a 60% decrease in sebum production. That is absolutely incredible. The sample size was very small, 10 men, but with results that dramatic there must be some correlation.
This is the initial study in which they looked at delivery vehicles for the cream http://www.academicj...hmood et al.pdf
Here's the actual report showing the sebum reduction (yes, its long but it works)
It's clearly because the EGCG (and others) inhibited DHT conversion in the skin. I've been thinking about trying to replicate this study with actual green tea, but the fact that fresh brewed green tea "spoils" within 8-12 hours makes it very impractical, as you'd have to make fresh tea everyday. I say it spoils because studies have shown then when fresh brewed green tea is exposed to air, the catechins chemically break down, and 8 hours later you could have around a 60% decrease from the fresh brewed version.
But, like they did in the study, using a green tea extract (liquid) skirts around this problem (the study basically used alcohol to create fresh extract). The extracts are generally stable, and easily mixed into other mediums.
Green Tea Extract can be very expensive, especially if you want organic or caffeine free, so once I'm able to buy some I will (currently a broke college student LOL). I plan to make a 5% green tea solution (stronger than the study to account for the less pure/fresh source of green tea available to me AND the fact that I will not be using an emulsifier or wax as they did, thus decreasing the amount of solution/cream I can actually apply to my face)
And no worries Fred, this inhibits DHT conversion but should NOT increase estrogenic activity when used topically.
Edited by CBIOT13, 05 March 2013 - 10:08 AM.