Appearance: White powder

Package:1kg per bag

MOQ:1kg

Shelf life: two years.

Storage conditions: Store in a cool, dry place at low temperature;

Pro-cysteine is a lightening agent with dual whitening and anti-aging effects, exhibiting strong antioxidant, detoxification properties, and the ability to inhibit tyrosinase activity. 

It enhances skin brightness by promoting glutathione biosynthesis in subcutaneous cells and improving the skin's capacity to neutralize oxidative free radicals, .

thereby strengthening its natural antioxidant defense barrier. Additionally, it addresses various skin concerns including aging, dryness, atrophy, peeling, discoloration, 

sagging, acne, itching, and eczema.

Key efficacy and dosage instructions for Procysteine (Oxothiazolidinecarboxylic acid, CAS: 19771-63-2):

I. Core Efficacy

Pro-cysteine is a safe, stable, and water-soluble cosmetic ingredient that serves as a precursor to cysteine. It is metabolized into cysteine within cells, 

thereby stimulating the synthesis of glutathione (GSH).  Its primary benefits include:

Whitening & Spot Fading: Effectively inhibits tyrosinase activity and reduces melanin synthesis, thereby improving skin unevenness and achieving 

significant whitening and spot-fading effects.

Antioxidant and Anti-Aging Effects: Possesses potent free radical scavenging capabilities, protecting the skin from natural aging and photoaging damage; 

simultaneously activates cellular regeneration and promotes keratinocyte stratification.

Skin Conditioning & Moisturizing: Softens the stratum corneum, enhances skin elasticity, texture, and radiance, while improving UV protection capacity1.

II. Recommended Dosage and Application Range

This ingredient is rapidly absorbed by the skin at concentrations of 1–10% and exhibits excellent compatibility with the skin. 

The recommended dosage for cosmetic formulations is as follows:

Daily Care Products: Recommended concentration range is 0.5%–2.0%.  Suitable for everyday use in whitening, moisturizing, antioxidant serums, and creams. 

Enhance nursing products (Intensive Care): The recommended concentration range is 2.0%–5.0%.  Suitable for intensive repair formulations targeting issues 

such as pigmentation and photoaging. 

Scope of application: Widely recommended for use in various cosmetic formulations aimed at skin brightening, spot removal, anti-aging/anti photoaging, 

antioxidant effects, and moisturization.