--- title: "Tetrahexyldecyl ascorbate" description: "Understand tetrahexyldecyl ascorbate, an oil-soluble vitamin C derivative, including its cosmetic role, stability limits, and product claims." --- # Tetrahexyldecyl ascorbate > Understand tetrahexyldecyl ascorbate, an oil-soluble vitamin C derivative, including its cosmetic role, stability limits, and product claims. Source: https://cosmetic-labs.com/glossary/tetrahexyldecyl-ascorbate Created: 2026-11-10T10:22:11+00:00 Modified: 2026-11-10T10:22:11+00:00 Author: Emilie SCHOL ## Definition of Tetrahexyldecyl ascorbate Tetrahexyldecyl ascorbate is a lipid-soluble vitamin C derivative used in cosmetics as an [antioxidant](https://cosmetic-labs.com/glossary/antioxidant) and skin-conditioning ingredient. It is not the same molecule as pure ascorbic acid, and its presence does not establish the results of a finished product. ### Learn more ## What is tetrahexyldecyl ascorbate? Tetrahexyldecyl ascorbate is a chemically modified form of vitamin C. It is often shortened to THDC or THD ascorbate. Its affinity for oily materials makes it different from unmodified ascorbic acid and from water-soluble derivatives such as ascorbyl glucoside. On an ingredient list, look for the full name Tetrahexyldecyl Ascorbate rather than relying only on a vitamin C claim on the front of the package. Its cosmetic functions include antioxidant and skin conditioning. These function names explain why a formulator may select the ingredient. They are not a measurement of how much a particular serum improves uneven tone, fine lines, or skin texture. A formula can contain this derivative without having clinical evidence for every benefit associated with vitamin C. ## Why the formula matters The lipid-soluble character of this ingredient gives formulators an option for products built around oily ingredients or an oil-containing phase. That property describes how the molecule behaves in a formula. It does not, by itself, prove that the product reaches a particular skin layer or outperforms a water-based vitamin C serum. Stability is also more specific than a simple stable or unstable label. In laboratory testing, this derivative degraded rapidly when exposed to singlet oxygen, an oxidizing species. Adding acetyl zingerone prevented that degradation under the tested conditions. This finding supports careful formulation, not a conclusion that every product needs that one companion ingredient or that every serum without it fails. ## What the evidence can and cannot show Laboratory work has examined this derivative alone and in combination with a stabilizing antioxidant using skin-cell models and chemical tests. Those experiments help explain possible behavior. They do not establish visible wrinkle reduction or brightening in people using an arbitrary retail product. Results for a combination also cannot be assigned entirely to the vitamin C derivative. The laboratory experiments included measurements of gene expression and collagen proteins in skin-cell systems. These are experimental outcomes rather than measurements of visible facial lines in users of a finished serum. Even a favorable result for the derivative combined with acetyl zingerone cannot show that the derivative alone caused the entire change. Evidence for pure ascorbic acid also should not be treated as direct evidence for this modified molecule. Its description as an ascorbic-acid precursor is not a guarantee of equivalent delivery or efficacy. ## How to assess a product claim First identify the actual derivative, then look at evidence for the finished formula and the specific result being promised. A percentage of tetrahexyldecyl ascorbate is not an interchangeable percentage of pure vitamin C. Comparing products only by their headline vitamin C numbers can therefore be misleading. For practical selection, separate three questions: what the ingredient is, whether the formula remains suitable through its intended use, and whether the finished product has demonstrated the benefit you want. Ingredient identity answers only the first question. Follow the product directions and do not use an antioxidant claim as a reason to replace sunscreen. Sources ## Sources and references References supporting this page are listed below. Source access dates and supported claims are recorded in the evidence notes where available. [Tetrahexyldecyl Ascorbate (THDC) Degrades Rapidly under Oxidative Stress but Can Be Stabilized by Acetyl Zingerone to Enhance Collagen Production and Antioxidant Effects](https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML) URL [https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML](https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML) [Historical ingredient inventory: Tetrahexyldecyl Ascorbate](https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1594998408317&uri=CELEX:32006D0257) URL [https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1594998408317&uri=CELEX:32006D0257](https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1594998408317&uri=CELEX:32006D0257) [Safety Assessment of Ethers and Esters of Ascorbic Acid (2017)](https://www.cir-safety.org/sites/default/files/ethasb062017rep.pdf) URL [https://www.cir-safety.org/sites/default/files/ethasb062017rep.pdf](https://www.cir-safety.org/sites/default/files/ethasb062017rep.pdf) [THDC oxidative-stress laboratory study](https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML) URL [https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML](https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML) [THDC oxidative-stress laboratory study](https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML) URL [https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML](https://www.ebi.ac.uk/europepmc/webservices/rest/PMC8395926/fullTextXML) --- ## Site identity - Organization: Cosmetic Labs - Description: Cosmetic Labs is a directory and a platform to meet all your cosmetic product development needs. From sourcing raw material to finding the best CRO for your needs. - Website: https://cosmetic-labs.com