The Probiotic Yogurt I've Been Making That Makes Me Feel Great

Better digestion, more energy, and some fascinating research into skin health, testosterone, and oxytocin. Here's why I've become interested in making L. reuteri yogurt at home.

I've been experimenting with making my own probiotic yogurt lately, and I've noticed two things: my digestion seems to have improved, and I've been feeling noticeably more energetic.

That's been enough to convince me to keep making it.

What makes this yogurt particularly interesting is the bacteria I'm cultivating: Limosilactobacillus reuteri, commonly known as L. reuteri.

Unlike conventional yogurt, which typically relies on a combination of familiar yogurt cultures, this method focuses on a specific probiotic organism and uses a longer fermentation period.

I originally became interested in L. reuteri after reading about research connecting certain strains to some surprising health benefits, including healthier skin, testosterone production, oxytocin, and wound healing.

Some of these findings come from animal studies and haven't been confirmed in humans, but they're fascinating nonetheless.

And while I can't say for certain that the yogurt is responsible for the improvements I've noticed, I'm enjoying the results.

Here's what got me interested, what researchers have discovered, and how I've been making it in my own kitchen.

A probiotic with some surprising potential

L. reuteri is a species of beneficial bacteria naturally found in the digestive systems of some humans and animals.

Like other probiotics, it can interact with our gut microbiome. What's particularly interesting is that certain strains appear to influence biological processes well beyond digestion.

Researchers have explored connections between L. reuteri and inflammation, skin condition, reproductive health, and the gut-brain connection.

Three areas especially caught my attention.

1. Skin health: The probiotic glow

One of the most fascinating studies was published in PLOS ONE in 2013 by researchers associated with MIT.

The researchers discovered that mice consuming L. reuteri developed noticeably thicker skin and shinier, healthier-looking fur.

Their findings included increased skin thickness, more active hair follicles, and changes in the skin's oil-producing cells.

The researchers described the phenomenon as a "glow of health."

What's remarkable is that the changes weren't simply attributable to the nutritional content of yogurt. Giving mice the bacteria themselves produced similar effects.

The findings suggest that certain gut bacteria may influence skin biology through interactions with the immune system.

It's an intriguing possibility: what we eat could influence our skin's condition through mechanisms that have little to do with traditional skincare.

2. Testosterone: An unexpected discovery

This one really caught my attention.

In a 2014 study, researchers found that male mice consuming L. reuteri maintained higher circulating testosterone levels and showed less age-related testicular deterioration than control animals.

The probiotic-fed mice also exhibited increased numbers of Leydig cells, which are responsible for producing testosterone.

Researchers suspected that reduced inflammation played an important role.

Now, this wasn't a clinical trial demonstrating testosterone increases in men. It was an animal study, and human effects remain uncertain.

Nevertheless, the connection between gut bacteria, inflammation, and reproductive hormones is fascinating.

It raises an interesting question: could the composition of our microbiome influence how well our bodies maintain hormonal health as we age?

That's certainly an area I'd like to see explored further.

3. Oxytocin: The connection between your gut and your brain

Perhaps the most interesting finding involves oxytocin.

Oxytocin is sometimes called the love hormone because of its involvement in bonding, social interactions, and feelings of connection.

But oxytocin also contributes to other biological processes, including wound healing.

Researchers discovered that giving mice L. reuteri increased oxytocin-related activity and accelerated skin wound healing.

In subsequent research, scientists also reported improved wound-healing responses in a small human pilot study involving L. reuteri supplements.

This suggests that certain probiotic bacteria may communicate with the nervous and immune systems in ways we're only beginning to understand.

I find the idea especially interesting because I've been feeling so good since incorporating this yogurt into my routine.

I can't tell you whether oxytocin has anything to do with that. But research into the gut-brain connection makes the experience all the more interesting.

How I'm making my own L. reuteri yogurt

The process is surprisingly simple, although it differs from conventional yogurt making.

For my latest batch, I used:

6 cups of whole milk

8 crushed L. reuteri probiotic tablets

3 tablespoons of inulin powder

A programmable yogurt maker

Glass yogurt jars

I start by heating the milk to approximately 180–200°F, which is a standard yogurt-making technique that also helps improve the finished texture.

After heating, I allow the milk to cool to approximately 100°F.

Next, I mix in the crushed probiotic tablets and inulin. Inulin is a prebiotic fiber that can serve as a food source for certain beneficial microorganisms.

The mixture goes into glass jars and then into my yogurt maker, which I set to approximately 100°F for a planned 36-hour fermentation.

That's the biggest difference from conventional yogurt.

Traditional yogurt generally ferments for several hours at a somewhat higher temperature. The L. reuteri approach uses a lower temperature and a much longer incubation period.

It's worth knowing that this extended method is experimental rather than a standardized food-safety-tested yogurt recipe. The finished product's bacterial composition and safety can't be established by fermentation time alone.

Why I'm going to keep making it

For me, the most compelling reason to continue making L. reuteri yogurt isn't a laboratory study. It's how I've been feeling.

My digestion has improved, and I've noticed more energy throughout the day. Those are meaningful improvements in my everyday life.

Of course, I'm also intrigued by the research into skin health, testosterone, and oxytocin. Whether those findings eventually translate into measurable benefits for humans remains an open question, but they make this little fermentation project that much more interesting.

There's something satisfying about taking a few simple ingredients—whole milk, a probiotic starter, and some inulin—and using temperature and time to create something potentially beneficial.

It's inexpensive, interesting to make, and has become a part of my routine that I genuinely look forward to.

Sometimes the most interesting things happening in your kitchen are the ones you can't see.

Research worth exploring

Probiotic Bacteria Induce a “Glow of Health” (2013) — Research into L. reuteri, skin thickness, and hair growth in mice.

Probiotic Microbes Sustain Youthful Serum Testosterone Levels and Testicular Size in Aging Mice (2014) — Research connecting L. reuteri with testosterone and reproductive aging in mice.

Microbial Symbionts Accelerate Wound Healing via the Neuropeptide Hormone Oxytocin (2013) — Research connecting L. reuteri, oxytocin, and wound healing.

Microbial Lysate Upregulates Host Oxytocin (2017) — Follow-up research including a small human wound-healing pilot study.