General Description

Distearyl thiodipropionate (DSTDP) is a versatile antioxidant and UV stabilizer used in various industries, including cosmetics. It offers protection against free radicals and UV damage, while also functioning as an emulsifier and preserving moisture on the skin. DSTDP is a white to yellowish solid that is insoluble in water but soluble in organic solvents. It remains stable under normal temperatures and pressures and demonstrates exceptional thermal stability and compatibility with different polymers and materials. Additionally, DSTDP is non-toxic and non-corrosive, ensuring safety and reliability in industrial settings. However, some studies have raised concerns about potential skin irritation and allergic reactions, so patch testing and consulting with professionals are recommended. Overall, Distearyl thiodipropionate is a valuable ingredient that enhances product quality and performance.

Figure 1. Distearyl thiodipropionate

Properties

Distearyl thiodipropionate is a white to yellowish solid with a molecular formula of C31H54O2S and molecular weight of 498.86. It is insoluble in water but soluble in organic solvents. DSTDP has a slight characteristic odor and remains stable under normal temperatures and pressures. DSTDP functions as an antioxidant and UV stabilizer, effectively safeguarding the skin from free radicals and UV damage. It also acts as an emulsifier, aiding in the dispersion of other ingredients in personal care products. Moreover, it possesses water-resistant properties that help preserve moisture on the skin. With its extensive use as an antioxidant, DSTDP finds application in various industries including plastics, rubbers, and adhesives. It demonstrates exceptional thermal stability and compatibility with diverse polymers and organic materials. Furthermore, DSTDP is non-toxic and non-corrosive, ensuring safety and reliability in industrial settings. In summary, distearyl thiodipropionate is a versatile antioxidant offering superior protection against oxidation and compatibility with different materials. ¹

Applications

Distearyl thiodipropionate (DSTDP) is an important ingredient commonly used in cosmetics for its versatile applications. It is derived from the reaction between thiodipropionic acid and stearic acid, resulting in a compound that offers numerous benefits to cosmetic formulations. It also acts as a skin conditioning agent, softening and smoothing the skin's surface, making it ideal for moisturizers and foundations. Additionally, DSTDP functions as a viscosity controlling agent, allowing manufacturers to achieve the desired consistency and spreadability of their products. It showcases a stabilizing effect on color cosmetics, preventing color fading caused by external factors. DSTDP is generally considered safe for use in cosmetics, approved by regulatory bodies such as the FDA and CIR. In summary, distearyl thiodipropionate is a versatile ingredient widely utilized in cosmetics for its antioxidant properties, skin conditioning abilities, viscosity control, stabilizing effect on color cosmetics, and safety profile. Its wide range of applications makes it a valuable component in various skincare and makeup products, resulting in enhanced product quality and performance. ²

Safety

While distearyl thiodipropionate is generally considered safe, it is important to note that some studies have raised concerns about its potential to cause skin irritation and allergic reactions. In addition, like many chemicals used in personal care products, there is still limited information available on the long-term effects of exposure to this ingredient. To minimize your risk of adverse reactions, it is recommended to perform a patch test before using any new skincare product containing distearyl thiodipropionate. This involves applying a small amount of the product to a small area of skin and waiting for 24-48 hours to see if any redness, itching, or other signs of irritation occur. In conclusion, while distearyl thiodipropionate is generally considered safe for use in cosmetics and personal care products, it is important to be aware of the potential risks and to take appropriate precautions when using products containing this ingredient. Reading labels, performing patch tests, and consulting with a dermatologist or healthcare provider can help ensure the safety and effectiveness of your skincare routine. ³

Reference

1. PubChem. Compound Summary: Distearyl thiodipropionate. National Library of Medicine, 2005, CID:12738.

2. Murat P, Ferret PJ, Coslédan S, Simon V. Assessment of targeted non-intentionally added substances in cosmetics in contact with plastic packagings. Analytical and toxicological aspects. Food Chem Toxicol, 2019, 128:106-118.

3. Diamante C, Fiume MZ, Bergfeld WF, et al. Final safety assessment of thiodipropionic acid and its dialkyl esters as used in cosmetics. Int J Toxicol, 2010, 29(4 Suppl):137S-50S.