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The use of green tea extract in cosmetic formulations: not only an antioxidant active ingredient
Author(s) -
Gianeti Mirela D.,
Mercurio Daiane G.,
Maia Campos Patricia M. B. G.
Publication year - 2013
Publication title -
dermatologic therapy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.595
H-Index - 68
eISSN - 1529-8019
pISSN - 1396-0296
DOI - 10.1111/j.1529-8019.2013.01552.x
Subject(s) - transepidermal water loss , stratum corneum , medicine , active ingredient , green tea extract , dermatology , camellia sinensis , cosmetics , ingredient , lotion , skin aging , food science , polyphenol , green tea , photoaging , antioxidant , traditional medicine , pharmacology , chemistry , botany , biochemistry , pathology , biology
Green tea ( GT ) extracts contain polyphenols, known to be effective free radical scavengers, and other ingredients that could also provide benefits to the skin. This is a report on clinical studies using objective, noninvasive methods to evaluate the effects of cosmetic formulations containing GT . Experimental formulations were supplemented or not (vehicle) with 6% C amellia sinensis glycolic leaf extracts ( GT ). These formulations were applied to the forearm skin of 24 volunteers, and their effects were evaluated before and after 2 hours, 15 and 30 days according to the following parameters: stratum corneum water content, transepidermal water loss, skin viscoelastic‐to‐elastic ratio ( Uv / Ue ), and microrelief. The volunteers were instructed not to apply any formulation in an area of the forearm (control area). Experimental formulations ( GT ) increased skin moisture in the long‐term study, indicating that GT has a prolonged moisturizing effect. The Uv / Ue was significantly enhanced after 30 days of topical application of the experimental formulation when compared with vehicle and control. After 15–30 days, skin microrelief was significantly improved due to a reduction in skin roughness. The results suggest that GT ‐containing cosmetic formulations have pronounced moisturizing effects and improve skin microrelief.