B vitamins may improve sleep quality and reduce stress.

When the body sleeps, the mind flourishes

The prestigious scientific journal Nutrients published in June 2025 that vitamins B1 and B2 could improve sleep quality and reduce stress, thanks to their interaction with the intestinal microbiota.

The origin of the news

In the study, 76 university students were included. Researchers analyzed biological samples from urinary levels of vitamins B1 (thiamin) and B2 (riboflavin), as well as fecal samples to assess the composition of their gut microbiota. From these data, their stress, anxiety, and sleep quality levels were measured using standardized scales.

The gut-brain axis: a highway to well-being

What's interesting about this study is that it didn't focus solely on the direct effects of vitamins on the nervous system, but rather explored a more complex pathway: the connection between the gut microbiota and the brain, known as the microbiota-gut-brain axis. This axis enables two-way communication that influences our emotions, sleep, and behavior. And this is where B vitamins come into play.

According to the authors, higher levels of vitamin B1 were associated with better sleep quality and less sleepiness. In turn, vitamin B2 was linked to less daytime fatigue. Both nutrients could modulate stress and sleep thanks to their antioxidant capacity, their role in neurotransmitter synthesis, and their effect on cellular energy metabolism.

And what does science tell us?

Gut bacteria such as Bifidobacterium, Enterobacteriaceae, and Enterococcus showed an inverse relationship with participants' anxiety levels, while a higher presence of Bacteroides was linked to higher stress levels. These data reinforce the idea that the balance of our microbiota not only affects our digestion, but also our emotional state and our ability to sleep soundly.

In the words of the research team, these results open the door to "precision nutrition" based on the interactions between micronutrients, intestinal flora, and mental health. Although this is a cross-sectional, exploratory study—meaning it does not establish causality—its value lies in pointing a promising path toward more natural and personalized interventions to improve psychological well-being.

What if insomnia wasn't just in your head?

Poor sleep isn't just a matter of racing thoughts or work stress. Sometimes, it's your body that's crying out for help. Science reminds us that something as simple as a B vitamin deficiency or an imbalance in the gut microbiota can disrupt the mechanisms that regulate sleep, mood, and anxiety.

What if instead of continuing to fight insomnia, we started nourishing ourselves so that sleep comes on its own?

At Longevitas, we believe that emotional well-being is built from within. That's why we focus on intelligent and personalized supplementation that supports intestinal balance and provides the micronutrients necessary to maintain calm, rest, and mental clarity.

Breathe in. Breathe out. And remember:

"Happiness is not something postponed for the future; it is something designed for the present."
— Jim Rohn, entrepreneur and motivational philosopher