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Why pH of skincare products is important? | Cherie
Why pH of skincare products is important? | Cherie
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Why pH of skincare products is important?

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thechicsbeauty
The pH is defined as the negative logarithm (base ten) of the concentration of free hydrogen ions in aqueous solution. The pH of skin surface ranges from 4.5 to 6 making it slightly acidic. The acidic nature of the whole skin surface was first claimed by Heuss in 1892; however, the first scientific study was carried out by Schade and Marchionini in 1928, who called it the acid mantle. The “acid mantle” protects the skin by inhibiting the growth of pathogenic organisms, regulating keratinization, desquamation and wound healing. Any disruption in the acid mantle disrupts the activity of enzymes involved in barrier function and anti-microbial protection. The skin pH and the buffering capacity of the skin surface are made up of the components of the stratum corneum as well as the secretions from sebaceous and sweat glands. Sweat is an important contributor towards skin acidity owing to its content of amino acid, lactic acid, and urea, which supplement skin NMF levels. The formation of stratum corneum barrier requires enzymes that are pH dependent. Two lipid-processing enzymes β-glucocerebrosidase and acidic sphingomyelinase require a pH of 5.6 and 4.5, respectively. An increased skin surface pH activates enzyme serine proteases, which causes degradation of corneodesmosomes and affects the skin barrier. pH also has a big impact on the skin microbiome. The bactericidal activity, because of dermicidin and nitrites in sweat, occurs optimally at pH 5.5. The resident bacterial flora changes as pH increases causing increase in population and activity of P. acnes and Staphylococcus aureus which are responsible for acne and eczema. All these result in contact dermatitis, atopic dermatitis, ichthyosis, acne vulgaris and Candida albicans infections. Products with high pH cause swelling of skin follicles affecting the permeability of the skin making it dry, sensitive, and susceptible. Most of the skincare products are formulated within the pH range of normal healthy skin except the exfoliating products that contain alpha-hydroxy acids (AHA’s), Vitamin C products and chemical peel which work at low pH. Facial oils, cleansing oils, balms are not pH dependent.
Nov. 22, 2020

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