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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Palmamidopropyl Trimonium Methosulfate    Okay Used for conditioning hair, and it comes from both plant and synthetic sources [Gottschalk (12th ed.) pg 1757]. This has been a mystery ingredient. I have searched all my books, and even online, and I haven't been able to find any information on it yet. I will put here what I've gathered about the separate components of this ingredient. However, until I can find information on the entire ingredient, this can only be an educated guess. I even called Aveda (they are about the only company I see using this ingredient), and they said this was a conditioning ingredient. This isn't an objective source for information, though (it's not like they'd tell me if it was a bad ingredient or anything). This ingredient's name has an identical structure to Babassuamidopropyltrimonium methosulfate, which is a conditioning ingredient made from the seeds of the Babassu palm tree. So it's looking like Palmamidopropyl trimonium methosulfate is a similar conditioning agent that's made from the oil of a different kind of Palm as the only difference.—T Update: I looked it up in my big new CTFA dictionary, and really all it had to say was that it was a hair conditioner from plant and synthetic sources. But I am proud I'd guessed about as much on my own.—T See also: Babassuamidopropyltrimonium methosulfate Palmamidopropyl Source(s): Winter Gottschalk http://www.hort.purdue.edu/newcrop/duke_energy/elaeis_guineensis.html

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.