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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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Stearamidopropyl dimethylamine
Caution
Used to keep product from separating, but it can also be used to add slip and conditioning. Made from Stearic fatty acid. Dimethylamine can be slightly corrosive and irritating if it isn't neutralized properly (according to my trusty Organic Chemistry text book, Dimethylamines are very alkaline [pg 983]). This comes in a tan, waxy solid. It's known to cling well to the hair without being greasy [Hunting (Conditioning) pg 395 and Winter pgs 491, 208].
—I have to say that this is in most of my favorite products that I've been using for years, and my hair is fine. I'm thinking this has been neutralized enough so it isn't corrosive and is conditioning instead. This ingredient often gives enough slip to a conditioner that I can comb my hair with it, and not need another slippery ingredient in the product. However, I'm going to put it as a "caution" so you can decide for yourself—T
This is in one of my favorite, go to conditioners that I've been using for well over ten years, and another I've been using for about five years. It has not caused any problems as far as conditioning and defining my hair.
See also:
Stearic acid
Source(s):
Winter Hunting
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Stearamidopropyl dimethylamine lactate
Okay
This is used for conditioning and as an emulsifier (keeps a product from separating into its oil and water components). Known for being easy to rinse from hair [Hunting (Conditioning) pg 395].
Source(s):
Hunting
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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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