Thioctic Acid

Product Description

Green Stone Swiss supplies high-purity Thioctic Acid manufactured under strict GMP-aligned quality systems, ensuring consistent batch-to-batch performance for professional cosmetic and personal care brands worldwide. Our direct factory supply model delivers reliable bulk quantities with full technical documentation and free sample support.

Thioctic Acid is alpha-lipoic acid, a disulfide-containing acid. In leave-on skin care it is used as an antioxidant active, not as a preservative and not as a fragrance. This grade is a yellow crystalline powder that dissolves in ethanol and in oils, and only slightly in water.

Serums and creams continue to specify this INCI when the formula needs a defined lipoic acid rather than a plant extract. Cosmetic-grade Thioctic Acid remains a high-interest bulk antioxidant when the assay is on the COA.

Product Specification

• INCI Name: Thioctic Acid
• CAS No.: 1077-28-7
• Molecular Formula: C₈H₁₄O₂S₂
• Molecular Weight: 206.33 Da
• Appearance: Yellow crystalline powder
• Purity: Typical ≥99%
• Solubility: Soluble in ethanol and oils; slightly soluble in water
• Suggested pH: 4.0–6.5 in finished systems
• Storage: Store in a cool, dry place; protect from light and air

Key Benefits & Applications

Thioctic Acid is a yellow antioxidant powder used in leave-on antioxidant systems.

• Used in serums and creams positioned for antioxidant care
• Dissolves in the oil or alcohol phase, not as a simple water solute
• The yellow color of the powder is the material itself
• Pairs with ferulic acid when the chassis uses two antioxidants
• Typical use level: 0.05–0.5% in the finished formula

Formulation Guidelines

Follow these guidelines to dissolve Thioctic Acid before the emulsion cools.

• Suggested Use Level: Typical 0.05–0.5% in the finished formula
• pH Range: Suggested 4.0–6.5
• Addition: Dissolve in ethanol or in the oil phase; add below 40°C
• Stability: Protect from light and air; the powder can darken if left open
• Combine with Resveratrol when a second oil-phase antioxidant is needed beside Thioctic Acid.