Cysteic Acid
What is Cysteic Acid?
Cysteic acid is a sulfonic acid derivative of the amino acid cysteine, formed by oxidation and characterized by its polar sulfonic group. Found naturally in trace amounts in human hair keratin, it is manufactured synthetically for use in cosmetics. It falls into the skin conditioning category, commonly featured in moisturizers, serums, and hair products. Functionally, it serves as a humectant, binding water molecules to the skin's surface to promote hydration and flexibility. Its chemical structure enables interaction with skin proteins, enhancing texture and barrier support. Additionally, the sulfur moiety contributes to mild antioxidant capacity by scavenging reactive species, helping maintain skin comfort without common irritants.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
- Helps maintain skin hydration as a humectant.
- Supports antioxidant activity for skin protection.
- Aids skin conditioning for improved softness and smoothness.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| - Individuals with dry or dehydrated skin seeking moisture retention. | - Those with rare hypersensitivity to sulfur-containing compounds. |
| - Those interested in antioxidant support for daily skincare. | - Individuals preferring to avoid amino acid derivatives. |
| - People aiming to enhance skin texture and flexibility. | - People who have not patch-tested new ingredients. |
Safety Notes
- - Low hazard profile suitable for cosmetic use.
- - Non-comedogenic, unlikely to clog pores.
Frequently Asked Questions about Cysteic Acid
What is cysteic acid used for in skincare?
It acts as a skin conditioning agent, helping to hydrate and soften skin.
Is cysteic acid safe for sensitive skin?
It has a low irritation profile and is generally well-tolerated.
Does cysteic acid clog pores?
Rated non-comedogenic, making it suitable for acne-prone skin.