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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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Hydrolyzed   
Okay
A substance is often hydrolyzed so that it can be more water soluble. A hydrolyzed substance means that it has gone through a process so that it's liquefied, or turned partly to water. This reaction uses acids, bases, or enzymes. It often results in making a simpler compound from a more complex one (hydrolysis takes place when we digest food) [Winter pg 292]; [Hunting (Conditioning) pg 234].
Source(s): Winter Hunting http://www.chemistryexplained.com/Hy-Kr/Hydrolysis.html

Hydrolyzed Avena sativa (oat) protein    (aka Hydrolyzed oat protein)
Okay
Wheat protein turned partly into water created by a reaction with acid, an enzyme or another chemical reaction to break the wheat protein down into a simpler compound [Winter 7th edition page 290-291]. Serves as a humectant.
See also: Hydrolyzed Humectant
Source(s): Winter Hunting

Hydrolyzed Brazil nut protein   
Okay
Protein from the oil of the Brazil nut that's been processed so it's been partially broken down to make it more water soluble [Winter 7th ed.,pgs 116, 290].
See also: Hydrolyzed Protein Brazil nut oil
Source(s): Winter

Hydrolyzed collagen   
Okay
Animal collagen that's been made more water soluble through a process that liquefies, or turns it partly to water, using acids, bases, or enzymes [Winter (7th edition) page 290].
Source(s): Winter

Hydrolyzed Elastin    (aka Elastin)
Okay
Known for being a great moisturizing and conditioning ingredient. It’s a humectant, and it also has marketing appeal because it’s a natural ingredient. It help improves the feel of hair that’s been damaged. It’s known for improving the glossiness, body, and makes hair easier to comb. It may also reduce the irritation caused by other ingredients in the product.

Elastin is a protein that’s found in animal connective tissue that’s needed to be elastic. In order for it to work in hair, it has to be water-soluble. To make it water soluble, it’s broken down (hydrolyzed) by a mild base or heat. It’s available as a yellow or dark yellow, clear liquid or powder [Hunting (Conditioning) pages 236-237].
See also: Protein Elastin Hydrolyzed
Source(s): Hunting

Hydrolyzed keratin    (aka Hydrolyzed animal keratin)
Okay
Keratin (a protein found in hair, skin ,horns, hooves, feathers, and nails) that's been turned partially to water by means of acid, enzyme, or some other way to make it water soluble [Winter (7th edition) page 291]. Functions as a skin, hair, or nail conditioner [Gottschalck page 1223].
See also: Hydrolyzed Keratin
Source(s): Winter Gottschalck

Hydrolyzed Silk    (aka Hydrolyzed Silk Protein)
Okay
See Hydrolyzed Silk Protein.
See also: Hydrolyzed Silk Protein

Hydrolyzed Silk Protein    (aka Hydrolyzed Silk)
Okay
This is a form of protein made from broken down silk proteins.These aren’t known to work as well as keratin derived proteins. These do not coat the hair very well [Hunting (Conditioning) Pages 349-352].
See also: Protein
Source(s): Hunting

Hydrolyzed soy protein   
Okay
Often used in hair and skin conditioners. Made from liquefied soy protein. Winter pg 293.
See also: Hydrolyzed
Source(s): Winter

Hydrolyzed sweet almond protein   
Okay
Protein extracted from almonds that has been liquified.
See also: Protein Hydrolyzed

Hydrolyzed vegetable protein   
Okay
Liquified vegetable protein. Pg 293.
See also: Hydrolyzed
Source(s): Winter

Hydrolyzed vegetable protein PG-Propyl silanetrol    (aka Keravis)
Okay
Hair conditioning ingredient. A mixture of hydrolyzed vegetable protien and silicone. Helps lubricate the hair.
See also: Hyrolyzed vegetable protein
Source(s): http://www.cosmeticsdatabase.com/ingredient.php?ingred06=719730¬hanks=1 http://www.crodausa.com/datasheets/FeatureArchive/PCFeatureKeravis.htm

Hydrolyzed wheat protein    (aka Hydrolyzed Avena sativa protein)
Okay
Wheat protein turned partly into water created by a reaction with acid, an enzyme or another chemical reaction to break the wheat protein down into a simpler compound [Winter 7th edition page 290-291]. Serves as an emollient and moisturizer. May cause an allergic reaction to those sensitive to wheat proteins.
See also: Protein Hydrolyzed
Source(s): Barel Winter http://leodora.com/2007/01/19/hydrolyzed-wheat-protein/

Hydrolyzed wheat protein pg-propyl silanetriol    (aka Hydrolysed wheat protein pg-propyl silanetriol; Hydrolyzed wheat protein hydroxypropyl polysiloxane)
Okay
Hair and skin conditioner made from hydrolyzed wheat protein and silicone. Often used in makeup, shampoos, hair conditioners, and even mascaras [Gottschalck (12th ed) pg 1241].
See also: Silicone Hydrolyzed wheat protein
Source(s): Gottschalck



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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