Probiotics: The Friendly Bacteria That Do You Good!

Just like us, our microbiome is unique and constantly exposed to the challenges of life and the environment. And just like us, it sometimes needs support—especially during difficult times—and reliable allies like probiotics.

The Microbiome: A Hidden World

There are 10 times more bacteria in our gut than cells in our entire body—around 100 trillion. This vast bacterial population forms what is known as the gut microbiome, an internal universe made up of “good,” “bad,” and “neutral” microorganisms. Each person has a unique microbiome, composed of different bacterial species and quantities, spread across the 400 m² surface of the intestines.

When the microbiome is in balance (a state called eubiosis), meaning beneficial bacteria are dominant, it performs vital functions that contribute to good health: nutrient absorption, barrier effect against pathogens and pollutants, and modulation of the immune system in the gut (which houses around 70% of the immune cells in the entire body).

As a result, any disturbance (known as dysbiosis)—caused by an imbalanced diet, fatigue, stress, illness, medication, age, etc.—can significantly affect our well-being and health… and not just our digestion.

Probiotics: The Body’s Temporary Health Reinforcements

In 2001, the World Health Organization (WHO) defined probiotics as:

“Live microorganisms which, when administered in adequate amounts, confer a health benefit on the host.”

They are typically friendly bacteria taken to support health when the body is weakened (due to poor diet, stress, fatigue, medication) or not yet strong enough (as in children or the elderly). These probiotics temporarily settle in the gut, helping restore balance and optimal functioning (digestion, immunity) until the microbiome can regain its strength—then they are naturally eliminated. In that sense, they act as temporary health reinforcements for the body.

However, not all probiotic strains have the same properties or effects. This is why strain-specificity is so important.

Some probiotic strains may be helpful for digestive discomfort, while others can be taken preventively to prepare the body for changes—like cold weather and viruses, pollen season, or dietary shifts.

Your healthcare professional can advise you on the most appropriate and effective probiotics for your needs—don’t hesitate to ask for guidance.