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Clin Exp Dermatol. 2012 Mar;37(2):164-8. doi: 10.1111/j.1365-2230.2011.04216.x.

Effect of topical clay application on the synthesis of collagen in skin: an experimental study.

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1
Department of Physiology, ABC Faculty of Medicine, University of São Paulo, São Paulo, Brazil.

Abstract

BACKGROUND:

Clay is often used in cosmetic treatments, although little is known about its action.

AIM:

To evaluate the effect of topical clay application on the histoarchitecture of collagen fibres in rat skin.

METHODS:

Animals received a daily application of clay and retinoic acid (RA) 0.025% to the dorsal skin over 7 and 14 days, under vaporization at 37 °C for 40 min. Control skin was not vaporized. Samples from each region were excised, and stained with picrosirius red for collagen evaluation.

RESULTS:

Seven days after clay treatment, an increase in the number of collagen fibres was observed in treated skin compared with control skin (51.74 ± 1.28 vs. 43.39 ± 1.79%, respectively, P < 0.01), whereas RA did not alter the collagen level (45.66 ± 1.10%). Clay application over 14 days did not induce a further increase in skin collagen, whereas treatment with RA did (58.07 ± 1.59%; P = 0.001 vs. control).

CONCLUSION:

Clay application promotes an increase in the number of collagen fibres, which may account for its beneficial effects.

[Indexed for MEDLINE]

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