The use of green tea extract in cosmetic formulations: not only an antioxidant active ingredient
Article first published online: 13 MAR 2013
© 2013 Wiley Periodicals, Inc.
Special Issue: Update on Understanding and Managing Chronic Wounds
Volume 26, Issue 3, pages 267–271, May/June 2013
How to Cite
Gianeti, M. D., Mercurio, D. G. and Maia Campos, P. M. B. G. (2013), The use of green tea extract in cosmetic formulations: not only an antioxidant active ingredient. Dermatologic Therapy, 26: 267–271. doi: 10.1111/j.1529-8019.2013.01552.x
- Issue published online: 6 JUN 2013
- Article first published online: 13 MAR 2013
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- clinical efficacy;
- cosmetic formulations;
- skin biophysical techniques
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% Camellia 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.