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In the ingredient descriptions: Good means that I like to see this in a product's list of ingredients. Okay means this product appears safe for a curly person like me to use. Caution means that this ingredient may not be good in some hair care products, or for some people. Avoid means this ingredient may hurt your hair. If you see this ingredient in a hair product, it's best to put it down and walk away.
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Sodium lauryl sulfate
(aka SLS, Sodium lauryl sulphate)
Avoid
Very commonly used drying detergent cleanser. May cause drying and irritation of the skin due to how drying it is [Winter (7th edition) page 478]. Used for it's excellent foaming as well as a powerful cleanser that cuts through oils and sebum. It is an almost colorless liquid, but it's also available as a powder, flake, or even a "noodle" form in highest concentrations [Hunting (Shampoo) page 363.
May strip hair color by causing hair shaft to swell, increasing the chances of pigment being released. “Rumors were circulating at one time that sulfates were causing cancer. According to snopes.com, SLS does not cause cancer. But it can be an irritant if left on the skin”. For more information, check out: Sulfates, as well as Urban legends.
See also:
Irritant
Source(s):
Begoun Winter Hunting http://www.snopes.com/inboxer/household/shampoo.asp http://urbanlegends.about.com/library/weekly/aa090998.htm
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References:
Applewhite, Thomas H., ed. Proceedings of the World Conference on Lauric Oils: Sources, Processing, and Applications
AOCS Publishing, 1994.
Barel, André O., Marc Paye, and Howard I. Maibach., eds. Handbook of Cosmetic Science and Technology, Second Edition
Marcel Dekker, Inc., 2001.
Begoun, Paula. Don’t Go Shopping for Hair-Care Products Without Me. 3rd Edition.
Renton: Beginning Press, 2005.
Begoun, Paula. The Beauty Bible.
Renton: Beginning Press, 2002.
Begoun, Paula. Don’t Go to the Cosmetics Counter Without Me.
Renton: Beginning Press, 2003.
Bellum, Sarah, ed. The Beauty Brains: Real Scientists Answer Your Beauty Questions
New York: Brains Publishing, 2008.
Gottschalk, Tari E. and McEwen, Gerald N, Jr. PhD, eds. International Cosmetic Ingredient Dictionary and Handbook, Tenth Edition 2004, Volumes 1-4.
Washington D. C.: The Cosmetic, Toiletry, and Fragance Association, 2004.
Halal, John Hair Structure and Chemistry Simplified, Fifth Edition
Albany: Milady, 2002.
Hunting, Anthony L.L. Encyclopedia of Conditioning Rinse Ingredients.
Cranford, NJ: Micelle Press, Inc., 1987.
Hunting, Anthony L.L. Encyclopedia of Shampoo Ingredients.
Cranford, NJ: Micelle Press, Inc., 1983.
Johnson, Dale H. (Ed.). Hair and Hair Care, Cosmetic Science and Technology Series. Vol. 17.
New York: Marcel Dekker, 1997. Print.
Nnanna, Ifendu A. and Jiding Xia., eds. Protein-Based Surfactants: Synthesis: Physicochemical Properties, and Applications (Surfactant Science)
Madison Heights: CRC, 2001.
Quadflieg, Jutta Maria. Fundamental properties of Afro-American hair as related to their straightening/relaxing behaviour.
Diss. U of Rheinisch-Westfälischen Technischen Hochschule Aachen, 2003.
Schueller, Randy and Perry Romanowski, eds. Conditioning Agents for Hair and Skin.
New York: Marcel Dekker, Inc., 1999.
Winter, Ruth M.S. A Consumer's Dictionary of Cosmetic Ingredients: Complete Information About the Harmful and Desirable Ingredients Found in Cosmetics and Cosmeceuticals
New York: Three Rivers Press, 2005.
Zviak, Charles., ed. The Science of Hair Care (Dermatology)
New York: Marcel Dekker, Inc., 1986.
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