What you need to know about PHAs.

Poly-hydroxy acids (P.H.A.) are referred to assecond-generation A.H.A. (alpha-hydroxy acids). They work by exfoliating the dead cells accumulated on the skin's surface, to revive the complexion's radiance and tighten the pores. This chemical peeling also helps the ingredients of other skincare products to penetrate more deeply into the layers of the epidermis, enhancing their effectiveness.

The three main P.H.A.s used in cosmetics are presented below:

• The gluconolactone or gluconic acid : This is a P.H.A. naturally present in skin cells. This antioxidant effectively combats inflammation.

• The galactose : It is also naturally present in the body. Its role is to stimulate the production of collagen.

• Thelactobionic acid : This is a derivative of lactose that has a moisturising and soothing effect.

The PHA are true allies for maintaining and promoting a healthy epidermis. Indeed, these active ingredients have multiple benefits and work on several levels to erase irregularities and revive the radiance of dull and tired complexions:

• P.H.A.s are renowned for theirkeratolytic effect. They help to remove dead cells that clog pores and smooth the skin's texture. They work by dissolving intercellular bonds, thus stimulating cellular renewal. This process is called chemical exfoliation. Therefore, they prevent the appearance of blackheads as well as signs of ageing such as wrinkles and fine lines.

• Several studies have demonstrated their anti-inflammatory properties. Therefore, P.H.A.s are particularly recommended for taking care of oily skin prone to acne and/or skin showing marks due to post-inflammatory hyperpigmentation.

• The P.H.A.s are also moisturising : they capture and retain water in the epidermis and reduce skin dryness by half.

• Finally, they combat the phenomenon of glycation, a biological process responsible for the degradation of elastin and collagen, essential proteins of the dermal tissue to maintain firm and elastic skin.

Furthermore, the P.H.A.s are molecules of smaller size than the A.H.A.s (glycolic acid, lactic acid, citric acid...) and B.H.A.s (salicylic acid); thus, they penetrate less deeply into the skin layers, and are generally well tolerated by all skin types, even the most sensitive ones that cannot apply A.H.A.s and/or B.H.A.s.