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Amidinocysteinyl Hydrolyzed Keratin: An In-Depth Look at Its Role in Cosmetics

Article last updated: June 17, 2024

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Ever wondered what makes your favorite beauty products so effective? Dive into the world of Amidinocysteinyl Hydrolyzed Keratin and discover how this powerhouse ingredient is revolutionizing the cosmetics industry, from its intricate production process to its myriad of skin and hair benefits.

What is Amidinocysteinyl Hydrolyzed Keratin?

Amidinocysteinyl Hydrolyzed Keratin is a specialized cosmetic ingredient derived from the reaction of Amidinocysteine and Hydrolyzed Keratin. This compound is known for its multifunctional properties, making it a popular choice in various hair care and cosmetic products. This ingredient is a blend of amino acids and proteins that are essential for maintaining the health and structure of hair.

The history of Amidinocysteinyl Hydrolyzed Keratin in cosmetics is relatively recent, emerging as a result of advancements in protein chemistry and cosmetic science. Initially, keratin, a natural protein found in hair, skin, and nails, was hydrolyzed to break it down into smaller, more manageable fragments. This hydrolyzed keratin was then reacted with amidinocysteine, an amino acid derivative, to enhance its functional properties. The resulting compound, Amidinocysteinyl Hydrolyzed Keratin, combines the benefits of both components, offering improved performance in hair care formulations.

The production process involves hydrolyzing keratin, typically sourced from wool or feathers, into smaller peptides and amino acids. This hydrolyzed keratin is then chemically reacted with amidinocysteine under controlled conditions to form the final product. The process ensures that the beneficial properties of keratin are retained while enhancing its ability to interact with hair fibers, providing conditioning, strengthening, and protective benefits.

The Benefits/Uses of Amidinocysteinyl Hydrolyzed Keratin

In this section, we will delve into the officially recognized cosmetic benefits and uses of Amidinocysteinyl Hydrolyzed Keratin:


Amidinocysteinyl Hydrolyzed Keratin acts as an astringent, which means it helps to tighten and firm the skin. This can be particularly beneficial for those with oily or acne-prone skin, as it helps to reduce the appearance of pores and control excess oil production. By tightening the skin, it can also give a smoother and more refined appearance.

Film Forming

This ingredient has film-forming properties, which means it can create a protective layer on the surface of the skin or hair. This film can help to lock in moisture, protect against environmental damage, and provide a smooth, glossy finish. In hair care products, this can translate to shinier, more manageable hair that is less prone to frizz and damage.

Hair Conditioning

As a hair conditioning agent, Amidinocysteinyl Hydrolyzed Keratin helps to improve the texture and appearance of hair. It can penetrate the hair shaft to provide deep conditioning, making hair feel softer, smoother, and more hydrated. This can be especially beneficial for damaged or chemically treated hair, as it helps to restore strength and elasticity.

Hair Waving or Straightening

Amidinocysteinyl Hydrolyzed Keratin is also used in hair waving or straightening products. It helps to alter the hair’s structure, making it easier to achieve the desired style, whether that be curls or straight locks. This ingredient can help to maintain the style for longer periods, reducing the need for frequent touch-ups and minimizing heat damage from styling tools.

Note: the listed benefits above are exclusively based on the officially recognized and defined functions of the ingredient, as documented by the International Nomenclature of Cosmetic Ingredients (INCI).

Potential Side Effects & Other Considerations

Amidinocysteinyl Hydrolyzed Keratin is generally considered safe for topical use in cosmetic products. However, like any ingredient, it may cause side effects in some individuals. Here are some potential side effects to be aware of:

  • Skin irritation
  • Redness
  • Itching
  • Allergic reactions

Regarding individuals who are pregnant or breastfeeding, data and research on the topical usage of Amidinocysteinyl Hydrolyzed Keratin during pregnancy are lacking. Therefore, it is advisable for pregnant or breastfeeding women to consult a healthcare professional for further advice before using products containing this ingredient.

Adverse reactions to Amidinocysteinyl Hydrolyzed Keratin are relatively uncommon, but they can occur. To minimize the risk of an adverse reaction, it is recommended to conduct a patch test before widespread usage.

In terms of comedogenicity, Amidinocysteinyl Hydrolyzed Keratin is rated as a 1 on a scale of 0 to 5, where 0 is totally non-comedogenic and 5 is highly comedogenic. This means it is unlikely to clog pores and is generally suitable for individuals prone to acne, blemishes, or breakouts.

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