I take synthroid which is pretty common for people over 40. I have been taking it for 17 years. I have recently added Green Tea Extract from Kent. Because of discussion in another thred, the Kent representative pointed out that their green tea extreact has almost no caffeine (which is great for me because I am one of those women who get fibriotic breast tissue from consumption of caffeine.)

However, another person noted that there is an issue of the fluoride in greent tea that can counteract the effects of the synthroid.

I have attempeted to research this on the interent. All I get is "possible problems" not certainty--and it seems more with drinking green tea per se (which has caffeine) than the green tea extract. But nothing is conclusive--just warnings.

Anyone know of anything definitive--links to any studies? I like theffect the green tea extract has on my workouts. I only take it then -so that means I take one pill about 4-5 a week.

Any help would be appreciated.

I take synthroid which is pretty common for people over 40. I have been taking it for 17 years. I have recently added Green Tea Extract from Kent. Because of discussion in another thred, the Kent representative pointed out that their green tea extreact has almost no caffeine (which is great for me because I am one of those women who get fibriotic breast tissue from consumption of caffeine.)

However, another person noted that there is an issue of the fluoride in greent tea that can counteract the effects of the synthroid.

I have attempeted to research this on the interent. All I get is "possible problems" not certainty--and it seems more with drinking green tea per se (which has caffeine) than the green tea extract. But nothing is conclusive--just warnings.

Anyone know of anything definitive--links to any studies? I like theffect the green tea extract has on my workouts. I only take it then -so that means I take one pill about 4-5 a week.

Any help would be appreciated.


I don't know about the fluoride in green tea extract, but I do know you can buy decaf green tea. That is the route I would go.

I have no Thyroid.. and I take .300 synthroid and I've had no problem with green tea..
You might take it for a month or two and go in to get checked.. You should be getting your levels checked every 6 months to a year anyway..

I am going to paste a reply from a previous green tea thread in this forum. I can tell you that I contacted the manufacturer and they have no analysis for flouride because in their words "it has never been an issue", and there is no indutry standard to analyze GT extract for flouride. I would speak to my doctor if I had health issues and were concerned about them, as would be the case before taking any dietary supplement. Here is the pasted reply:


Honestly, I dont know too much about the ability of flouride to replace iodine in the body if you are deficient in iodine to begin with, as the Dr. illudes to in his article. Concerning flouride in GT, studies were done to determine if the improvements in tooth enamel and cavity protection from green tea consumption were actually due to what the study called it's "very low" flouride content. A dialyzed solution was created with the flouride removed, and the effects on enamel were the same. Suggesting that the GT works through different mechanisms. (Yu H, et al. Anticariogenic Effects of Green Tea. Fukuoka Igaku Zasshi)

As far as GT damaging the Thyroid, GT Extract is actually one of the prescribed supplements for thyroid cancer patients using CAAT therapy to augment chemo, radiation, or hormone treatments.

While the author talks about inprovements in stomach cancers and presumes it has more to do with iodine than GT, he does not mention the other studies on GT and other types of cancer that showed it to be beneficial. The majority of studies seem to show that it has more to do with GT, and less to do with Iodine, IMO.

Finally, the link which compared IV application to oral was making a comparison to standard brewed GT, which is a far cry from a standardized extract.

Here are some other interesting articles.
http://news.bbc.co.uk/2/hi/health/3125469.stm
http://www.cancer.gov/newscenter/pressreleases/tea
http://www.teatalk.com/health/cancer.htm
http://www.cancer.org/docroot/ETO/c...sp?sitearea=ETO
http://www.bccancer.bc.ca/PPI/Uncon...es/GreenTea.htm

Thank you so much, Kent Nutrition, for the information you were able to provide