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So, that said, is there a legitimate use for natural estrogen blockers? Yes, I believe so, assuming, of course, one is monitored by a physician, and that is simply for this simple reason: virtually all men in modern societies are inundated with estrogen. Bisphenol-A is on receipts and in plastics. Phthalates are in many plastics. Pesticides and many household chemicals as well as food additives can all increase a man's estrogen load. Unfortunately, rarely are men exposed to things that increase their T levels to balance things out. And this is undoubtedly one of the big reasons that we see fertility and testosterone levels falling worldwide.
For all these reasons, it may be prudent to consume a few natural estrogen blockers simply to lighten the toxic load that we are exposed to on a daily basis. Here are a few ideas:
1. Indolplex DIM. DIM (diindolylmethane) is well-known estrogen controller and a phytochemical in a number of plant foods including cruciferous vegetables and kale. Of course, researchers noticed these properties and a number of studies have shown promising results. DIM is known for switching the estrogen profile from the "bad" metabolites to the "good" metabolites.
However, DIM aficionados have gone one step beyond the studies and swear by Indolplex DIM, a DIM that is supposedly better absorbed than regular DIM and actually lowers estrdiol levels.. I believe both iHerb and the parent company sell it.
For the record I have no affiliation with this product. However, it has a good reputation in the steroid community for lowering estradiol levels and so I am just passing along information. However, there are two things to be aware of: a) although Indolplex DIM is fairly widely used in the alternative and steroid communities, there are no studies that I know of and, therefore, very little data on side effects and b) it is fairly expensive costing around $31 as of this writing for 60 capsules.
And how do you determine dosage? Well, you're forced to go by word of mouth. One of our posters on this thread of the Peak Testosterone Forum, basically got into a hypogonadism user group and found a word of mouth dosage and stuck with that. This is a big disadvantage in my mind as Arimidex dosing is fairly well known. An experienced doctor can fairly well look at your estradiol levels along with a couple of other factors and determine a reasonable starting dosage for Arimidex. Indoplex DIM seems much more art than science.
Sure DIM is in food, but once you megadose, is it really "natural" any more? I'll leave it up to you and your doctor to determine if this is a more natural solution.
CAUTION: This one is powerful enough that you should be under a physicians guidance and have your estardiol monitored regularly for the reason mentioned above. Again, you can hurt yourself if you drive your estrogen levels too low for too long. We had one user on the forum who claimed that his estradiol levels never recovered after months of taking too high of dosage on Arimidex. 
HRT USERS: Some men on HRT may find that they only need to control estradiol with a supplement or medication for six to twelve months, because often the body's testosterone and estrogen levels are stabilizing. You may be able to get away with lowering estradiol for six months while your a) estradiol levels stabilize or b) you lose weight.
2. Zinc. Although the studies have been somewhat mixed, many experts feel that zinc supplementation will likely raise testosterone in zinc deficient men. And zinc deficiency is probably not too unusual. As you can see in My Page on Sleep Aids, a combination of zinc, magnesium and melatonin greatly improves insomnia and some users on the forum have reported that just simple ZMA greatly helps with sleep. (Anything that helps with sleep will likely give a little boost to testosterone.)
Zinc is also known for its ability to limit the activity of aromatase. I don't think anyone has any doubt that it works to a certain extent and probably most powerfully if you are zinc deficient. However, I don't know of any studies that actually show zinc being used to clinically lower male estrogen/estradiol levels. (If you know of one, please post it on The Forum!) Furthermore, I do not read of the steroid guys reporting zinc as a silver bullet in this area.
I suspect the reason is that, to get a significant E2-lowering effect, one would have to consume a lot of zinc and this is probably risky based on the opinion of many experts. I cover this issue in my link on Zinc and ZMA, where I discuss how taking megadoses of zinc is a) likely hard on neurons and b) could lead to copper depletion.
So the bottom line is that taking a reasonable dosage (1-3 RDA's) of supplemental zinc, especially vegetarians and plant-based eaters, is not a bad idea. You may get a little bump downward in estradiol levels and many other benefits from taking zinc. However, but don't expect it to solve elevated estradiol levels.
3. Chrysin. This is an old and well-known aromatase inhibitor. It has a spotty reputation for a number of reasons, including poor absorbtion. However, a few years ago, Life Extension release a turbo-charged version that basically included piperine. Piperine increases the absorption rates of many herbals and supplements and it seems to work well with chrysin. For example, two of the anti-aging physicians, Drs. Smith and Whitcomb, that have answered the Peak Testosterone Questionnaires have mentioned (unprompted) chrysin as a regularly-used estrogen controller. And the fact that Life Extension, which is a well-respected supplement company, backs it is also a sign of its efficacy.
Are there concerns with chrysin? One side effect that has been reported is the slowing down of thyroid function. Obviously, you don't want to solve your estradiol problems just to create a new thyroid issue. See my link on Controlling Estrogen for a study that shows this as well.
4. Grape Seed Extract. Many studies have shown Grape Seed Extact to be an aromatase inhibitor . It also, in vitro at least, gives Vitamin C a longer shelf life. However, Grape Seed Extract has a couple of cautions that need to go along with it: 1) in combination with Vitamin C it apparently raises blood pressure  and 2) it may slightly decrease free testosterone because it can raise SHBG, the protein that binds to testosterone. It also is known for improving venous insufficiency. That said, Grape Seed Extract has many properties that will very likely help with erectile dysfunction and perhaps serve as a cheap subsitute for Pynogenol. For more information, read about it on my page covering Grape Seed Extract and Erectile Dysfunction.
However, there is one problem in using Grape Seed Extract as an aromatase inhibitor: you would simply have to take too much. For this reason, I have read of very few men actually using it for this purpose.
2) J Hypertensm 2005 Feb, 23(2):427-34
3) Cancer Res. 2006 Jun 1;66(11):5960-7
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