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Do probiotics increase testicle size?

Can probiotics increase testicle size?

As some of you know, gut health is raging in the mainstream media and scientific community.

And with good reason, we are discovering that our tiny gut passengers can actually do a lot of positive things for us.

Moreover, there is also a specific gut bacteria that seems to interact with testosterone: Lactobacillus reuteri.

So, how does it all work? How does microscopic bacteria influence our health?

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A Quick Story About … the Digestive Tract and its Passengers


The human body is an amazing machine and so is the digestive tract. At the end of the day, anything that comes in our mouths is dealt by our guts.

First, food is broken down in the stomach. The acidic environment of the stomach also ensures the neutralisation of any unwanted pathogens and microbes.

Simultaneously, many organs work full-time to help the digestive process. The stomach and pancreas produce enzymes that will further break down macro-nutrients (aka protein, carbs and fats).

Additionally, the liver will produce bile, which will then be released by the gallbladder into the stomach to facilitate the digestion of fat.

Then, food continues to be broken down through the “small” 20-feet long intestine.

And quickly enough, it becomes so small that the nutrients can start to be absorbed into the bloodstream.

Finally, anything that hasn’t gone into the bloodstream by now will make its way though the large intestine.

It’s in this 5-feet long intestine and in the small one where billions of gut bacteria reside.

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Now, the gut bacteria will start synthesising vitamins and fatty acids, and processing waste products.

But our intestinal bacteria does much more than processing nutrients and waste.

More than 75% of our immune system and more than 100 millions neurons lie in our gut!

In other words, our gut and its inhabitants are crucial for our resistance to disease and they can also communicate with our brain!

But what does it have to do with testosterone and testicle size?

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Do Probiotics Increase Testicle Size?


Earlier I mentioned Lactobacillus reuteri, a species of bacteria found across the animal kingdom, humans included.

This is one of the first species of bacteria that is naturally established in the guts of newborns.

In other words, this means that this is one of first batches of healthy bacteria that we all start existence with.

Now let’s jump to 2014.

A MIT study found that Lactobacillus reuteri also does wonders on males. (1)

The study showed that rats who were fed this probiotic exhibited:
  • increased levels of testosterone production,
  • higher levels of body hair,
  • increased quantity and improved quality of sperm
  • and finally, larger testicles!

So, Lactobacillus reuteri did INCREASE the size of the rodents tested in this study.

Moreover, this species also boosts vitamin D blood levels – which is also associated with higher T levels and thus…bigger testicles. (2)

Similarly, other species of bacteria can have a positive impact on testosterone levels.

For instance, Lactobacillus rhamnosus reduces the levels of cortisol in mice – aka the hormone of stress.

High levels of cortisol have been linked to lower levels of testosterone and reduced libido.

A supplementation of this probiotic can potentially reduce anxiety and all of its ill effects.

The Best Probiotics and How to Use Them

Probiotics are found in certain foods such as yogurt, sauerkraut, choucroute, kimchi, kombucha and other fermented foods. Ideally, eat some of these foods whenever you can.

Otherwise, the best way to get specific strains of probiotics is supplementation.

The best strain of Lactobacillus reuteri is ATCC 6475.

If you can’t find this particular strain, search for brands with great feedback, you will easily find what you need.

It’s also important to know that probiotics are generally safe. Nonetheless, there is always a tiny risk of side effects with any supplement.

Rest reassured, these are usually in the gastric department.

Worse case scenario, you may end up with an upset belly that will eventually fade away once your body has adjusted to the introduction of new healthy bacteria. 

So, eat plenty of fermented foods, find reliable probiotic supplements and enjoy your larger testicles!

Additionally, continue following our healthy tips and you will see improvements quickly!

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This article “Do probiotics increase testicle size?” was written by Michael King.

(1) Probiotic microbes sustain youthful serum testosterone levels and testicular size in aging mice. Poutahidis T, Springer A, Levkovich T, et al. PLoS One. 2014

(2) Association between plasma 25-OH vitamin D and testosterone levels in men. Nimptsch K, Platz EA, Willett WC, Giovannucci E. Clin Endocrinol (Oxf). 2012

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