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Soy Isoflavones & Testosterone Production in Men

by Pat
(United States)

Hi Mark,

I'm a 50 year old male.

A couple of years ago I was diagnosed with Hypogonadism.

My initial (2008) Total Testosterone value was 63 ng/dl.

I am currently taking Testim Gel, and my total testosterone levels have been restored to "normal"(according to my urologist).

However I'd like to do as much as humanly possible to Increase my Free Testosterone.

I’ve been taking a daily regimen of B6, Zinc, and Tribulus Terrestris.

I have also been taking a daily Soy Isoflavone, mainly due to a recommendation from “The Testosterone Syndrome” by Dr. Eugene Shippen.

After reading your information I’m not so sure that this is the right thing to do.

Should I stop the Soy Isoflavone supplement?

Soy Isoflavones & Testosterone Production in Men

Hi Pat,

Over 90 percent of the soy produced in the US these days is genetically modified.

The modified seed used to grow these plants is called Roundup Ready, which means the final crop is capable of surviving massive exposure to Monsanto's Roundup herbicide.

We're talking amounts that could kill an otherwise healthy, unmodified soy plant.

This fact alone would be enough to keep me off conventionally grown soy beans.

But what about organic?

Well, if your soy in unfermented, it's going to contain a nasty compound called goitrogens.

Goitrogens interfere with the development of thyroid hormones, shut down iodine metabolism, and wreak havoc on your entire thyroid system.


Research has demonstrated that soy isoflavones also inhibit the activity of thyroid peroxidase, an enzyme required for proper thyroid hormone synthesis.

Isoflavones also act as potent estrogen mimics

According to the Linus Pauling Institute...

Soy isoflavones can bind to estrogen receptors, mimicking the effects of estrogen...

That may work for a post menopausal woman, but it's not something I want happening in my body.

And let's not forget about all the phytic acid found in soy, which interferes with the absorption of calcium, magnesium, iron, and zinc.


Soy has one of the highest phytate levels of any grain, bean or legume out there...

And these phytates drastically reduce absorption of several minerals critical for optimal testosterone production.

Soy Isoflavones & Testosterone Production in Men

Soy has become the darling food here in the US, where processed, bleached, dried, and packaged industrial swill has become the norm.

And soy is industrialized if it's anything ...

Production occurs in factories where crushed soy beans are first mixed with an alkaline solution to remove all the fiber.

Then the solution is separated using an acid wash, followed up by another bath in an alkaline solution.

Next comes the final acid wash in aluminum tanks which leaches high levels of aluminum into the mash.

The curds are then spray dried at extremely high temperatures to produce the final product.

Not something you could pull off in the average kitchen.

And not something our ancestors were doing out on the savanna 30,000 years ago.

The bottom line!

The soy industry spends approximately 80 million annually to convince you that this highly processed garbage is an extremely healthy food.

That we should be consuming this substance, loaded with antienzymes, phytoestrogens, phytates, hemagglutinin, and goitrogens at every meal, every single day of the week.

Personally, I'm not buying it!

Soy Isoflavones & Testosterone Production in Men
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Comments for Soy Isoflavones & Testosterone Production in Men

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Feb 06, 2018
Thanks for the soy article post!
by: John R

Thank you for posting this article.

So important to be educated on this murky issue. Soy has been touted as the health food, meat/protein substitute for vegetarians and vegans for so long.

I'm glad that various bean proteins are now being introduced to help reduce the consumption of soy in health foods. Knowledge is power, only when it's activated.

Jan 17, 2015
Soy, I keep out!
by: Rodolpho

Hi Mark!

I still thank you for this fight for quality information. Congratulations on this magnificent contribution. After four years you following and applying the knowledge and proving in my own life, I still say: Soy, I keep out!

Dec 18, 2014
Soy protein
by: Solomon Cooper

I have read that testosterone can increase muscle mass. After a certain age the testosterone levels drop and the estrogen level increases. So is Soy protein a good option to increase the testosterone levels? Can you please update more details on that?

Hi Soloman,


Soy and Testosterone

Jul 12, 2014
RE: Almond milk
by: Anonymous

Almond Breeze milk has CARRAGEENAN. Not a good choice. Silk Almond milk does not.

Apr 11, 2013
Soy milk is breast milk
by: Lenny

When my baby girl started drinking soy milk as an infant, we noticed her breasts started to develop. When I asked the pediatrician, he told us to stop soy milk and switch to goats or almond milk. He said everyone calls soy milk, Breast Milk. We stopped and her breasts went back to normal.
Nuf said

Feb 03, 2013
Lecithin and Testosterone?
by: Anonymous

How about non-GMO lecithin granules?

Hi there,

What I'd be concerned with is half a cup of soy protein isolate poured into your morning smoothie, or 2 quarts of soy milk downed every day.

If you're not doing these types of things you have nothing got worry about.


Nov 07, 2012
Soy Milk?
by: Robert

I would like to know if Soy milk is bad, and full of Isoflavones too? I am lactose intolerant to regular milk. Should I not drink Soy Milk? Thanks! R.L.

Hello RL,

I'm not a big fan of soy milk. A good alternative is Blue Diamond Almond Milk. Go for the unsweetened variety. It tastes great, and isn't loaded with refined sugars.


Sep 01, 2011
Soy, I'm out!
by: Rodolpho

Hi Mark!

I want to thank you for this small observation, but of unimaginable importance to the balance of men's health ... and the world. Congratulations on this magnificent contribution. I will say now: Soy, I'm out!

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