Podcast: Episode 17, let's simplify the skin

Audio episode, how to choose your cosmetics?


We use cosmetics and more particularly treatments to take care of our skin. But do you really know what your skin is?

What is the skin?
  • it is an organ on the surface of our skin
  • it acts as a barrier to viruses, bacteria, pathogens and prevents them from entering our body
  • it consists of three layers:
  1. The epidermis, the most superficial layer, for the radiance of the complexion
  2. The dermis for the elasticity and resistance of the skin
  3. Fat cells to cushion shocks and regulate body temperature
How to take care of it on a daily basis?
  1. A gentle cleansing
  2. Good hydration
  3. Antioxidant protection

To learn more about the skin, see theepisode 9 of Below Cosmetics.

Episode Notes

  • Website : MastelCosmetics
  • The Instagram account: @mastelcosmetics
  • Did you like this article? 📌 Click on the images below to pin them on Pinterest and find them later!
Simplifions la peau : Explications rapides pour comprendre sa peau La peau, qu'est-ce que c'est ? Les 3 couches de la peau expliquées La peau, un organe qui rime avec beauté


Hello, you are listening to episode 17 of Les Sous de la Cosmétique, the Podcast which reveals and explains to you with clarity and sincerity the world of cosmetics. I am Julie Magand Castel, biologist, chemist and cosmetologist specialized in natural cosmetics and today we are starting a new episode format, shorter and simpler on notions of cosmetics, biology or good industrial practice. The first episode will focus on the skin because it is important to understand how it works to choose your cosmetics. Episode #9 was the long and more detailed version if you feel up to going into detail.


The skin is an organ that is on the surface of our body. It is in direct relation with the other organs and it also exchanges flows via the blood system. As the skin is in direct contact with our environment, one of its reasons for being will be to limit access to viruses, bacteria and all other external and foreign bodies that could make us sick. Our skin is a bit like the ultra-restrictive security guard of a super-rated nightclub.

It will also be used to protect against blows, shocks, changes in pressure and that in particular thanks to the fat cells, because yes our fat is part of our skin from a biological point of view. Fat cells are also there to regulate our body temperature. It's our kind of insulation, our own glass wool.

Knowing this, you can imagine that the thickness of the skin will differ from one place to another on our body. It will be much thinner at the level of the eyelids for example and much thicker at the level of our buttocks. These fatty cells are the deepest part of the skin, the one that is the most inward of your body. But I'm sure you've guessed it, because when you cut yourself, you bleed long before you see the fat in your skin, so that means that there is a more superficial layer which is vascularized, which contains blood vessels.

In fact, to be completely clear, the skin is divided into three layers, the deepest is the one that contains fat cells and also blood vessels. But there is also the middle layer, which is called the dermis. It's easy to remember, it's the origin of the word dermatology. Unsurprisingly, the dermis also contains blood vessels and it is he who is responsible for the elasticity of the skin and its resistance among other things. You have probably already heard about collagen in cosmetic ads. Well collagen is a protein which is found in the dermis, therefore in the middle layer of the skin and which gives it its resistance capacities. We hear a lot about it, because its quantity decreases as we age, which causes more saggy skin. This is why many cosmetics target their manufacturing process in the skin to stimulate its production or to prevent its degradation, finally whatever the strategy the goal is to maximize the amount of collagen to obtain firmer skin. The dermis is a layer which has a lot of activity and which we take care of a lot in cosmetics. Above the dermis is the layer of skin that is in direct contact with the outside. This layer is not vascularized, it has no blood vessels, but it plays an important role in the radiance of your complexion. It contains living cells and dead cells. Dead cells accumulate on the surface of the skin and are eliminated little by little, on their own. Or we can help eliminate them using cosmetics that exfoliate the skin, which will help to have a more radiant complexion.


To conclude, our skin is an organ that is broken down into three layers. The most superficial layer will play on the radiance of the complexion, the middle layer, the dermis will play on elasticity and resistance among other things, and the deepest layer is the fatty layer which serves to absorb shocks and regulate body temperature.

I hope you enjoyed this simplified episode and helped to understand overall what the skin was. You can find the notes of this episode on mastel.fr so mastelcosmetics.com, in the section Below of Cosmetics. If you enjoy this content, you will definitely enjoy our account Instagram @mastelcosmetics and if you want to help us out, you can leave a 5-star review on Apple Podcast. Thank you for your support, take care and see you soon!

1 comment

  • Guerin

    Hello! Encore une fois merci, j’adore tes podcast!
    (Un podcast sur le pH cutané pourrait être très intéressant)

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A chemist in the cosmetics industry for more than 5 years and a graduate of the Natural Raw Materials in Cosmetics Master's degree from ISIPCA, Julie is an expert in the development of natural cosmetic products.