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2005, Number 2

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Gac Med Mex 2005; 141 (2)

Inconsistency in sun protection factor (SPF) index in Mexico. The case of sunscreens for oily skin.

Castanedo-Cazares JP, Torres-Álvarez B, Briones-Estevis S, Moncada B

Language: Spanish
References: 20
Page: 11-114
PDF size: 37.77 Kb.


ABSTRACT

Background: In Mexico, information regarding sunscreen protection is not widely accessible from sources other than manufacturers. Objective: To assess the Sun Protection Factor (SPF) of 12, over the counter sunscreens for oily or acne-prone skin available in the Mexican market. Setting: Dermatology Department. Autonomous University of San Luis Potosí, Mexico. Subjects and Methods: Twenty healthy volunteers of skin type III and IV were tested. Sunscreen SPFs were measured using solar simulated radiation according to FDA final monograph. Results: SPFs ranged between 7.8 and 26.9. Overall SPFs determined by solar simulator showed values between 22% to 74% less than the one advertised in their labels. Conclusions: We warn about the potential risk of SPF overestimation as many of the sunscreens tested did not comply with their offered protection. A proper regulation is needed because sunscreens are considered cosmetic products and do not require clinical tests to verify their efficacy before marketing.


REFERENCES

  1. Kligman LH, Alin FJ, Kligman AM. Sunscreens prevent ultraviolet carcinogenesis. J Am Acad Dermatol 1980;3:30-5.

  2. 2. Moloney FJ, Collins S, Murphy GM. Sunscreens: safety, efficacy and appropriate use. Am J Clin Dermatol. 2002;3:185-91.

  3. 3. Castanedo-Cazares JP, Lepe V, Gordillo-Moscoso A, Moncada B. Dosis de radiación ultravioleta en escolares mexicanos. Salud Publica Mex 2003;45:439-44.

  4. 4. Cunliffe WJ, Gould DJ. Prevalence of facial acne vulgaris in late adolescence and in adults. BMJ 1979;1:1109-10.

  5. 5. Chisvert A, Salvador A. Determination of water-soluble UV-filters in sunscreen sprays by liquid chromatography. J Chromatogr A. 2002;977:277-80.

  6. 6. Department of Health and Human Services FDA, USA. Sunscreen Drug Products For Over-The-Counter Human Use; Final Monograph. Federal Register 1999, Vol. 64, No. 98. 27666-27693.

  7. 7. Norma Oficial Mexicana. NOM-141-SSA1-1995. Bienes y servicios. Etiquetado para productos de perfumería y belleza preenvasados. Secretaría de Salud, México.

  8. 8. Fitzpatrick TB. The validity and practicality of sun-reactive skin types I through VI. Arch Dermatol 1988;124:869-71.

  9. 9. Agin PP, Edmonds SH. Testing high SPF sunscreens: a demonstration of the accuracy and reproducibility of the results of testing high SPF formulations by two methods and at different testing sites. Photodermatol Photoimmunol Photomed 2002;18:169-174.

  10. Mackenzie LA. The analysis of the ultraviolet radiation doses required to produce erythemal responses in normal skin. Br J Dermatol 1983;108:1-9.

  11. Roelands R. Shedding light on sunscreens. Clin Exp Dermatol 1998;23:147-57.

  12. Damian DL, Halliday GM, Barnetson RStC. Sun protection factor measurement of sunscreens is dependent on minimal erythematous. Br J Dermatol 1999;141:502-507.

  13. Cross SE, Jiang R, Benson HA, Roberts MS. Can increasing the viscocity of formulations be used to reduce the human skin penetration of the sunscreen oxybenzone? J Invest Dermatol 2001;117:147-150.

  14. Jiang R, Benson HAE, Cross SE, Roberts MS. In vitro human epidermal and polyethylene membrane penetration and retention of the sunscreen benzophenone-3 from a range of solvents. Pharm Res 1998;15:1863-1868.

  15. Benson HA. Assessment and clinical implications of absorption of sunscreens across skin. Am J Clin Dermatol 2000;1:217-24.

  16. Stokes RP, Diffey BL. How well are sunscreen users protected? Photodermatol Photoimmunol Photomed 1997;13:186-188.

  17. Diffey BL. Has the protection factor has its day? BMJ 2000;320:176-177.

  18. Castanedo-Cazares JP, Lepe V, Torres-Alvarez B, Moncada B. A simple measure for applying sunscreens while on holidays. Dermatol Online J 2003;9:23.

  19. Wright MW, Wright ST, Wagner RF. Mechanisms of sunscreen failure. J Am Acad Dermatol 2001;44:512-9.

  20. Poon TSC, Barnetson RStC. The importance of using broad spectrum SPF30+ sunscreens in tropical and subtropical climates. Photodermatol Photoimmunol Photomed 2002;18:175-178




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