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L'acide lactique : leurs bienfaits pour les peaux grasses.

Lactic Acid, the Ally of Oily Skin (+).

Lactic acid is a fruit acid belonging to the alpha-hydroxy acid family. Like all acids of this class, lactic acid has exfoliating properties. It is very well tolerated and suitable for all skin types. Learn more about the benefits of lactic acid, for oily skin (+).

Summary
Published March 1, 2024, by Sandrine, Scientific Editor — 6 min read

Oily Skin: What Is It?

Oily skin is characterized by shiny, shimmering skin found mainly in the T-zone (forehead, nose, and chin). This is the result of excessive sebum secretion by the sebaceous glands. Since the activity of sebaceous glands is hormonally controlled, the main cause of hyperseborrhea is due to hormonal factors.

Note: Sebaceous glands are glands of the epidermis responsible for the secretion of sebum. They are present on the entire surface of the skin (in the dermis), except on the palms and soles (hairless areas).

Sebum is a complex mixture of lipids that are part of the hydrolipidic film. Its function is to protect the skin from external influences. It also helps maintain the moisture content of the epidermis and prevents insensitive water loss. Sebum is therefore essential for healthy skin.

However, if too much sebum is secreted, it can lead to unpleasant skin conditions such as the appearance of acne. This is because sebum clogs the pores, which are the openings of the sebaceous glands on the surface of the skin. In this greasy environment, the bacterium responsible for the development of acne, Cutibacterium acnes (formerly Propionibacterium acnes), which feeds mainly on sebum, can grow easily. This bacterium secretes pro-inflammatory substances that are responsible for inflammation and pimple formation.

To combat unpleasant skin symptoms associated with the hypersecretion of sebum, the use of cosmetics based on lactic acid can be interesting.

The Effect of Lactic Acid on Oily Skin

Oily skin is manifested by a sallow complexion, enlarged pores, and possibly, the appearance of impurities (acne, blackheads).

Using lactic acid skin care products can relieve the skin discomfort associated with excess sebum. Lactic acid is an AHA known for its keratolytic properties. In other words, it accelerates skin renewal by removing dead skin cells on the skin's surface. As a result, clogged pores are opened. Sebum can be better distributed on the skin surface. This allows Cutibacterium acnes to multiply less, which in turn reduces the appearance of pimples. In addition, accelerated cell renewal promotes the radiance of the complexion.

Thanks to its hygroscopic action, lactic acid also has moisturizing and hydrating properties. Contrary to popular belief, skin hydration is also essential for oily skin. It prevents transepidermal dehydration and restores the skin barrier to protect the skin from external influences.

Therefore, the use of a care product based on lactic acid, is interesting for oily skin, as it gently exfoliates the skin while respecting the skin barrier.

Our Care Products With Lactic Acid

We have formulated a serum with 10% lactic acid. It is highly concentrated and provides gentle exfoliation to your skin thanks to its action on the surface. By ridding the skin of dead skin cells, our gentle exfoliating serum revitalizes the complexion's radiance and fights impurities. The skin is smooth and radiant. In addition, it contains acerola extract as an antioxidant that fights free radicals responsible for a dull complexion. Our serum is suitable for all skin types (oily, dry, and combination). It is also suitable for sensitive skin because, unlike glycolic acid, it is non-irritating and penetrates less deeply into the skin.

You can also find lactic acid in our exfoliating mask. It is enriched with A.H.A. and P.H.A., exfoliates the skin, and leaves it smooth and soft. This concentrated gel mask removes dead skin cells to unclog pores and refine skin texture. Over time, it also helps to reduce blackheads. Due to the high concentration of AHA, it is not recommended for use by people with sensitive skin.

Since lactic acid is a photosensitizing molecule, this skincare should only be used in the evening. It is highly recommended to apply a broad-spectrum sunscreen the next morning.

Perform a skin tolerance test before each application of our lactic acid care. Put a few drops of your care in the crook of your arm or on the back of your hand and wait 24 hours. If you experience any skin reactions, do not use the product on your face.

Sources

  • SMITH W. P. & al. Epidermal and dermal effects of topical lactic acid. Journal of the American Academy of Dermatology (1996).

  • Rotsztejn H. & al. Lactic and lactobionic acids as typically moisturizing compounds. International journal of dermatology (2018)

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