ZLEY® AZA – Azelaic Acid (CAS 123-99-9):
Targets Breakouts & Post-Acne Marks for Clearer, Even-Toned Skin.
Product Overview
ZLEY® AZA (Azelaic Acid, CAS 123-99-9) is a multifunctional cosmetic ingredient used for brightening & spot correction, exfoliation, and skin conditioning. It offers the unique dual benefit of reducing hyperpigmentation while combating acne, making it a valuable active for problem-prone and uneven skin tones.
ZLEY® is a professional supplier of Azelaic Acid, providing stable quality, technical support, and global delivery services to over 60 countries.
ZLEY® AZA – Azelaic Acid Product Information
| Parameter | Specification |
| INCI Name | Azelaic Acid |
| CAS Number | 123-99-9 |
| Appearance | White powder |
| Recommended Usage | 1% – 20% |
| Processing | Dissolve in hot water or alcohol before adding to formulation |
Is ZLEY® AZA – Azelaic Acid Safe?
Yes. ZLEY® AZA is considered safe for cosmetic use under normal, reasonable, and foreseeable conditions at the following maximum concentrations:
| Product Type | Maximum Safe Concentration |
| Leave-on products | ≤ 0.3% |
| Rinse-off products | ≤ 10% |
Product Applications
In cosmetics and skincare, Azelaic Acid primarily functions as a spot-corrector, brightening agent, and exfoliant. It offers two key benefits in one ingredient:
Melanin reduction – Fades hyperpigmentation and evens skin tone
Acne control – Reduces bacterial populations on the skin surface, within hair follicles, and in sebaceous glands
Clinical vs. cosmetic usage levels:
| Application | Typical Concentration |
| Clinical/therapeutic | 10% – 20% |
| Cosmetic – Brightening | 2% – 5% |
| Cosmetic – Acne control | 4% – 10% |
Why Source ZLEY® AZA from ZLEY®?
Through over 20 years of dedicated effort and pursuit of excellence, ZLEY® has evolved into a modern enterprise integrating research, production, quality control, and sales. We are committed to providing the highest quality personal care raw materials, semi-finished products, and customized formulation solutions. We strive to meet the diverse needs of our customers and ensure the delivery of superior products and service.
Shipping Conditions
Before transport, inspect packaging containers to ensure they are intact and sealed. During transport, isolate from electrical sources, open flames, and other heat sources. This product is not classified as hazardous or a mixture and can be shipped as general cargo.
ZLEY® AZA – Frequently Asked Questions (FAQ)
Q1: How should ZLEY® AZA be incorporated into formulations?
A: Due to its limited solubility in cold water, Azelaic Acid should be pre‑dissolved in hot water or alcohol before being added to the main formulation. Once fully dissolved, it can be incorporated at an appropriate temperature depending on your formulation type.
Q2: Can ZLEY® AZA be used in leave-on products like serums and creams?
A: Yes, but note that the maximum concentration for leave‑on products is 0.3%. For higher concentrations (2–20%), Azelaic Acid is typically used in rinse‑off products (washes, masks) or clinical/therapeutic preparations rather than everyday leave‑on cosmetics. For leave‑on brightening serums, consider combining it with other brightening agents such as Niacinamide or Vitamin C derivatives to achieve the desired efficacy within the 0.3% limit.
Q3: Is ZLEY® AZA suitable for sensitive skin?
A: When properly formulated with pH adjusted to 5.5 and used at appropriate concentrations, Azelaic Acid is generally well‑tolerated, even by sensitive skin. However, as with any active ingredient, patch testing is recommended for final products intended for sensitive consumers. Starting with lower concentrations (2–4%) and gradually increasing can help build tolerance.