Does Soy Lower Testosterone? | A-Z Guide

Dr. Mike Jansen

Last Updated May 11, 2023

Dr. Mike Jansen

 May 11, 2023


Does soy lower testosterone?

Potentially! Keep reading to learn more about what the clinical data says about soy, and it’s impact on men’s testosterone levels.

The reality is…

If you consume a lot of soy and you’re worried about your hormone levels, you may want to consider removing it from your diet.

Below, we’ll detail the reasons why soy may not be the best choice for men trying to maximize their natural testosterone production.

We also answer your most important questions, including:

  • Are Soy Latte’s really that bad for testosterone?
  • If I eat soy, will I turn into a “soy boy”?
  • How much soy can I eat before it’s actually a problem?

…And much more!

Our team of experts has analyzed all of the latest scientific studies on soy and testosterone, to give you a comprehensive answer on this important topic.

This means you are getting science-based information that you can trust.

Now let’s get started!

Disclaimer: The contents of are for informational and educational purposes. We do not provide legal advice. Likewise, we do not provide medical advice, diagnosis, or treatment. Please consult your physician prior to consuming any over-the-counter supplements, like a natural testosterone booster, and/or getting a prescription for a pharmaceutical medication. Your access to is subject to our full disclaimer and terms of use.

What is Testosterone?

Testosterone is one of the most important hormones in the human body.

It plays a massive role in men’s overall growth and development, including how they look, feel, and perform on a day-to-day basis.

Here are some of the benefits of high testosterone levels in men [1-5]:

  • Enhanced immune function: Testosterone has been found to improve immune function, reducing the risk of infections and illnesses.
  • Improved mental health: Testosterone has been linked to improved mental health, reducing the risk of depression and anxiety disorders.
  • Increased energy levels: Testosterone plays a critical role in maintaining energy levels, helping men feel more alert and energized throughout the day.
  • Reduced risk of metabolic syndrome: Testosterone has been found to reduce the risk of metabolic syndrome, a cluster of conditions including high blood pressure, high blood sugar, and obesity.
  • Improved quality of life: Testosterone therapy has been shown to improve quality of life, including sexual function, mood, and energy levels, in men with low testosterone levels.

So what does the research say about soy, and it’s impact on men’s testosterone levels?

The truth may SHOCK you…

Does Soy Lower Testosterone

Soy And Testosterone | Clinical Data

Soy is a popular plant-based protein source that contains isoflavones, a class of phytoestrogens that can mimic the effects of estrogen in the body.

In recent years, soy has been the subject of numerous research studies. Specifically, researchers are trying to figure out if Soy consumption actually has a negative impact on men’s testosterone levels.

As you might have guessed, the latest clinical data is extremely interesting…

Isoflavones and Hormonal Effects

Soy contains isoflavones, such as genistein, daidzein, and glycitein, which have weak estrogenic activity.

Isoflavones can bind to estrogen receptors and have the potential to modulate hormonal activity in the body.

Indeed, it looks like this might be a potential mechanism for Soy lowering men’s testosterone levels…

Here are some of the most important findings from the latest clinical data:

  • Weak estrogenic activity: Isoflavones have a much weaker estrogenic effect compared to the body’s natural estrogen, and their impact on hormonal balance is generally minimal.
  • Estrogen receptor affinity: Isoflavones preferentially bind to estrogen receptor-beta (ERβ), which is less involved in reproductive tissues and more involved in other tissues such as bone and blood vessels.

Clinical Studies on Soy and Testosterone Levels

Overall, it’s incredibly unclear if soy consumption actually results in reduced testosterone levels in men.

Some studies show a clear relationship between soy consumption and declining testosterone levels, while others have failed to find a clear relationship between the two.

Here’s a brief sampling of some of the most important studies on soy and testosterone:

  • Limited impact: A 2010 meta-analysis of 15 placebo-controlled studies found that neither soy protein nor soy isoflavone supplements had a significant impact on testosterone levels in men.
  • Individual variability: Some studies have reported minor changes in testosterone levels in response to soy consumption, but the overall consensus is that the impact of soy on testosterone levels is minimal and varies among individuals.

Soy Consumption Recommendations

So is soy good or bad? The truth is it’s hard to say.

On the one hand, it makes sense that soy would lower men’s testosterone levels. On the other hand, the research papers on soy show that there really isn’t much of a correlation between soy consumption and reduced testosterone levels.

Here are some general guidelines, based on this information:

  • Moderate consumption: For most individuals, moderate soy consumption as part of a balanced diet is unlikely to have a significant impact on testosterone levels or overall hormonal balance.
  • Variety of protein sources: Diversify your protein sources by including a mix of plant-based and animal-based proteins in your diet to ensure a well-rounded nutrient profile.
  • Consult a healthcare professional: If you have concerns about soy consumption and its potential impact on your hormonal balance or health, consult a healthcare provider for personalized advice.

In conclusion, the clinical data suggest that soy consumption has a limited impact on testosterone levels in men.

Moderate soy consumption as part of a balanced diet is generally considered safe and unlikely to significantly affect hormonal balance.

If you have concerns about soy and testosterone levels, consult a healthcare professional for personalized guidance.

Does Soy Lower Testosterone?

The relationship between soy and testosterone levels is complex.

Overall, it does not appear that soy has much of an impact on men’s testosterone levels – at least according to the latest research studies.

Here’s why [6-10]:

  1. Limited impact: A meta-analysis of 15 placebo-controlled studies found that neither soy protein nor soy isoflavone supplements had a significant impact on testosterone levels in men. This suggests that, for most individuals, moderate soy consumption does not lower testosterone levels.
  2. Individual variability: Some studies have reported minor changes in testosterone levels in response to soy consumption, but the overall consensus is that the impact of soy on testosterone levels is minimal and varies among individuals. Factors such as genetics, overall diet, and lifestyle can influence how soy consumption affects an individual’s testosterone levels.
  3. Moderate consumption: Consuming soy in moderation as part of a balanced diet is generally considered safe and unlikely to have a significant impact on testosterone levels or overall hormonal balance.

Of course, we don’t recommend you go out and binge on soy beans and soy lattes… however, having soy once in a while probably won’t hurt your natural testosterone production.

Here at, we’re probably going to continue avoiding Soy based products just to be safe. However, we won’t hold it against you if you decide to start eating soy products based on the latest research data.

Does Soy Lower Testosterone

Testosterone Levels and Aging

Testosterone is a crucial hormone for men, orchestrating the development of male traits, bolstering muscle strength, and overseeing sexual performance.

The normal “reference range” for men’s testosterone levels is about 300 – 1,200 ng / dl, or nanograms per deciliter. Of course, total testosterone levels in men differ across age groups.

Here’s what you need to know:

  • Teenage males: 300 – 1200 ng / dL
  • Young adult males: 300 – 1200 ng / dL
  • Males in their 40s: 252 – 916 ng / dL
  • Males in their 50s: 215 – 878 ng / dL
  • Males in their 60s: 196 – 859 ng / dL
  • Males in their 70s: 156 – 819 ng / dL

These figures emphasize the broad range of testosterone levels, with each individual exhibiting specific concentrations. A natural decline in testosterone synthesis occurs as men advance in age.

In recent years, the diminishing testosterone levels in men have become a pressing issue.

Multiple factors have been identified as contributors to this decline, including:

  1. Environmental influences: Exposure to endocrine-disrupting compounds found in plastics, pesticides, and everyday items can negatively impact hormone balance, possibly resulting in decreased testosterone levels.
  2. Lifestyle habits: The prevalence of sedentary behaviors, unhealthy eating patterns, and obesity can impede testosterone production. Incorporating regular exercise, maintaining an appropriate body weight, and consuming a balanced diet can support optimal testosterone levels.
  3. Persistent stress: Long-term stress can elevate cortisol levels, which may in turn inhibit testosterone generation. Applying stress-management strategies, engaging in consistent physical activities, and ensuring adequate sleep can promote hormonal equilibrium.
  4. Sleeping patterns: Suboptimal sleep quality has been associated with a decline in testosterone levels. Emphasizing the significance of restorative sleep and adhering to a consistent sleep schedule can foster efficient hormone synthesis.

So how do you know if you have low T? The truth is men with low testosterone levels often exhibit some tell-tale signs and symptoms.

Continue reading to learn more…

Signs and Symptoms of Low Testosterone in Men

Low testosterone (T) in men can lead to a variety of signs and symptoms that can significantly affect quality of life.

Here are some of the common signs and symptoms:

1. Sexual Dysfunction

  • Decreased sex drive
  • Difficulty getting or maintaining an erection
  • Decreased sperm count

Studies have shown that low T can significantly reduce sex drive and cause sexual dysfunction.

One study found that men with low T had a higher incidence of erectile dysfunction (ED) and reduced sexual desire compared to men with normal T levels.

Another study found that testosterone replacement therapy (TRT) improved sexual function and satisfaction in men with low T.

2. Physical Symptoms

  • Decreased muscle mass and strength
  • Increased body fat
  • Decreased bone density
  • Fatigue and decreased energy levels
  • Hot flashes and night sweats

Low T can also lead to physical symptoms that affect daily life.

Studies have shown that men with low T have decreased muscle mass and strength, increased body fat, and decreased bone density.

They may also experience fatigue, decreased energy levels, and hot flashes/night sweats.

3. Psychological Symptoms

  • Depression
  • Anxiety
  • Mood swings
  • Cognitive impairment

Low T can also affect mental health and cognitive function.

Studies have found a link between low T and depression, anxiety, mood swings, and cognitive impairment.

One study even found that TRT improved cognitive function in older men with low T.

If you experience any of these symptoms, it is important to talk to your healthcare provider about testing for low T and discussing potential treatment options.

Does Soy Lower Testosterone

Can Testosterone Replacement Therapy Help You?

Are you struggling with low testosterone levels and wondering where to turn for help?

Look no further than testosterone replacement therapy – the #1 medical treatment in the world for men with low testosterone levels!

Here are just a few of the benefits that men on TRT enjoy on a day-to-day basis:

  • Increased energy levels
  • Improved sleep quality
  • Increased muscle mass
  • Reduced body fat
  • Enhanced sexual performance

There’s just one question… which online TRT provider should you pick? Don’t worry – we’ve got you covered.

After reviewing dozens of clinics, we can confidently say that Fountain TRT is the #1 online TRT provider in the United States!

Fountain TRT was founded by Dr. Doron Stember, a board-certified urologist with decades of experience treating men with low T. Dr. Stember is dedicated to helping men regain their energy, vitality, and overall quality of life through personalized TRT treatment plans.

Here are a few reasons why Fountain TRT stands out as the best online TRT clinic in the world:

  • Experienced and dedicated doctors: Our team of world-class TRT doctors has decades of combined experience in treating men with low testosterone levels. They are dedicated to helping you achieve the best possible results from your TRT treatment.
  • Easy and convenient process: We know your time is valuable, which is why we’ve made the TRT process as easy and convenient as possible. Simply fill out our online questionnaire, perform a comprehensive blood test, and begin using your prescription testosterone medication as directed by your TRT doctor.
  • Customized treatment plans: At Fountain TRT, we understand that each patient is unique, which is why we create personalized treatment plans tailored to your specific needs and preferences. Whether you prefer testosterone injections, creams, or gels, we have the right treatment option for you.
  • Ongoing patient support: We believe in providing ongoing support to our patients throughout their TRT journey. Our team of patient support specialists is available to answer any questions you may have and provide guidance as needed.
  • Home delivery of medications: We understand that picking up medications from a pharmacy can be inconvenient, which is why we offer home delivery of your TRT medications right to your door.

If you’re ready to take control of your low testosterone levels and improve your quality of life, look no further than Fountain TRT.

Their team of experienced TRT doctors and patient support specialists is here to guide you every step of the way!

Sign up for TRT today with our top-rated USA doctors...

TRT Alternatives

Are you tired of feeling sluggish, weak, and uninterested in sex?

Have you tried numerous testosterone boosters and failed to see any real results?

Look no further than Maximus Tribe, the revolutionary testosterone-boosting medication that’s taking the market by storm!

The secret to Maximus Tribe’s success lies in its active ingredient, Enclomiphene. This powerful substance is a highly concentrated form of the testosterone boosting drug Clomid.

When used in men, Enclomiphene has been shown to “trick” the brain into producing more testosterone, resulting in significant improvements in muscle mass, strength, and libido.

Research shows that men who get started with Maximus Tribe experience the following benefits:

  • Increased muscle mass and strength
  • Improved libido and sexual function
  • Enhanced energy and stamina
  • Improved mood and mental clarity

…And much more!

In fact, the latest studies show that enclomiphine (the key ingredient in Maximus Tribe) can boost men’s testosterone levels by as much as 200-300 points!

If you’re ready to take your testosterone levels and your life to the next level, give Maximus Tribe a try.

With a money-back guarantee and numerous success stories from satisfied customers, you have nothing to lose and everything to gain!

Order Testosterone Booster from our top-rated USA vendor...

Soy And Testosterone | Verdict

So, what’s the verdict – does soy lower testosterone?

In other words, can consuming soy products negatively impact testosterone production or hormonal balance?

After evaluating numerous research studies, it’s evident that the link between soy and testosterone levels is not as clear-cut as it might appear.

While some studies have suggested a potential impact on testosterone, the overall evidence is extremely inconsistent…

Here are three key findings from the article:

  • Soy contains phytoestrogens, which can mimic the effects of estrogen in the body but have a much weaker impact on hormone receptors.
  • Some studies have shown a slight reduction in testosterone levels with high soy consumption, while others have found no significant effects.
  • The majority of research indicates that moderate soy intake as part of a balanced diet does not have a detrimental impact on testosterone levels or overall hormonal balance.

For those concerned about soy and its potential effects on testosterone, it’s important to consider the existing evidence and maintain a balanced, varied diet.

If you’re experiencing symptoms of low T, testosterone replacement therapy (TRT) can offer numerous benefits, including improved mood, increased energy, and enhanced overall well-being.

If you’re considering TRT, we HIGHLY recommend contacting a reputable online TRT provider like Fountain TRT.

Many men who start TRT often wonder, “Why didn’t I begin this sooner?”

So what are you waiting for?

Get in contact with Fountain TRT today and get ready to feel like a fitter, younger, and more confident version of yourself!


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