Abstract
Clay has a great biomedical application potential, however there are just a few instrumental studies and the impact of lake clay on the skin has not yet been studied. The DermaLab skin analysis system (Cortex Technology) was used for hydration, elasticity, transepidermal water loss (TEWL) and pH measurements after lake clay facial applications. Research included short-term tests (measurements 20 and 60 min after clay application) and long-term tests (application every 4th day for 3 weeks with measurements 20–24 h post-application). Control measurements and application tests to exclude contact allergy were made beforehand. No volunteer (n = 30) had positive allergic reaction. The matched-pairs design was applied: the right and left parts of forehead were used for the test and control groups. The Wilcoxon signed-rank test (significance level p = 0.001) was applied for statistical analysis. There were statistically significant pH changes demonstrated during the short-term measurements. The long-term measurements provided data that clay significantly improves skin hydration and elasticity.
Highlights
Healthy lifestyle is gaining popularity as well as consumers demand for natural products including cosmetics is soaring
All volunteers (n = 30) had negative contact allergy tests on lake clay
In T20 short-term tests after removal the clay mask hydration slightlycontact rose from
Summary
Healthy lifestyle is gaining popularity as well as consumers demand for natural products including cosmetics is soaring. Latvian clay deposits have a potential to be used in manufacturing of cosmetic products containing clay [3]. Clays can eliminate excess grease and toxins from skin, and are said to be effective for dermatological diseases such as furunculosis and management of ulcers [12]. They are used to treat various cutaneous conditions such as seborrheic dermatitis, psoriasis, chronic eczemas and acne [9,18]. The study of Carretero et al report that clay minerals can be powerful in cosmetic products, especially for hair care, due to their peculiar properties [12]
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