If you don't read vol.1, 👉 Indepth Knowledge of Microbiome for Skincare : vol. 1
We have our body’s immune system, which is always prepared for war with bad microorganisms. Since the micro-organisms are mostly staying there, the immune system always stands behind the micro-organisms, which form a standoff. The fight will start upon a slight trigger. They are placed near together. In front, micro-organisms and the immune system will keep on fighting. This means that our body continuously creates a system for defending against the outside and our body's immune system is completely prepared through the surface of the food pipe.
When the micro-organism enters the body which we were exposed to since young, the body creates immunity against the micro-organisms. In other words, we create immunity easily. Rather than sorting beneficial and harmful micro-organisms, it is essential to create immunity to fight against the specific micro-organisms as soon as they enter the body. Since probiotics are in such form, it is a beneficial microorganism.
The skin forms a barrier in a way similar to the gut. Both skin and gut have barriers. These two barriers have a very similar structure. The barrier makes the gut for absorbing only the necessary substances while preventing external substances. While food and nutrient easily enter the small and large intestine, the system prevents the external micro-organisms from entering. Like the gut, the skin barrier contains ceramide, cholesterol, fatty acids, and tight junctions that primarily block external substances. When the skin barrier is damaged, various microorganisms can easily enter the skin. So, caring for the skin barrier, such as moisturizing the skin, is crucial to protect the skin. It is the same as the intestinal wall. When we protect the wall, external substances can’t enter inside easily. It is the same principle.
The barrier is also covered with skin flora that forms a defense against harmful bacteria that attempt to pass the skin. This flora could be considered another biosystem. Hence, skin flora forms another barrier. Skin flora that usually exists on the skin distributes substances to block harmful bacteria. When there are too many species of bacteria that reside on the skin, this may eventually cause problems. Then, why are bacteria beneficial and necessary for the human body? When the body is constantly exposed to stimuli from harmful bacteria, the body continuously guards against such stimulation. Accordingly, the microbiome encourages the immune system to function steadily. The body’s constant exposure to bacteria triggers the defense system, the immune system, to operate continuously.
Probiotics cosmetics and so-called microbiome cosmetics do not use the microorganisms that originally exist on the skin surface. They usually the bacteria called Lactobacillus and this micro-organism mostly exists in the gut instead of the skin surface. Where do we apply Lactobacillus? We use it on the skin. Would Lactobacillus make the skin better? Applying the micro-organism is the same principle as eating them. As we eat micro-organisms, the immune system against micro-organisms called Lactobacillus gets activated. When the immune system is familiar with microorganisms applied to the skin, our body easily forms immunity against it. As the immune system gets activated to prevent other external substances from entering the body.