7-DEHYDROCHOLESTEROL

Description: 7-DEHYDROCHOLESTEROL — EMULSION STABILISING, SKIN CONDITIONING, VISCOSITY CONTROLLING.

All Functions: EMULSION STABILISING, SKIN CONDITIONING, VISCOSITY CONTROLLING

Quick Facts:

• Category: emollient

Proven Benefits At A Glance:

• 7-dehydrocholesterol (7-DHC) is a naturally occurring sterol present in human skin
• When skin is exposed to sunlight, 7-DHC converts to vitamin D3 to support immune function
• 7-DHC plays a crucial role in cholesterol production during fetal development
• In rare genetic conditions, abnormal 7-DHC levels can cause light sensitivity and skin issues
• Age does not significantly affect how much 7-DHC is available in skin for vitamin D production

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🧪 7-DEHYDROCHOLESTEROL

7-DEHYDROCHOLESTEROL

CAS Number: 434-16-2

Also Known As: —

Category: emollient

EC Number: 207-100-5

Korean Name: 7-데하이드로콜레스테롤

Cholesta-5,7-dien-3(beta)-ol

7-DEHYDROCHOLESTEROL is an emollient ingredient used in skincare formulations.

🌍 Regulatory Status

📊 Comedogenicity

📚 Research & Evidence

🔬 The Science

7-dehydrocholesterol is a sterol—a type of fatty molecule—that exists naturally in your skin. Its primary known function relates to vitamin D synthesis: when ultraviolet radiation from sunlight hits your skin, 7-DHC is converted into vitamin D3, which then supports immune system function and maintains calcium balance in the body (Photochem Photobiol Sci, 2022; Nutrients, 2024). On a molecular level, 7-DHC is the final precursor in cholesterol biosynthesis (Biochim Biophys Acta, 2000). During normal development, an enzyme called 7-dehydrocholesterol reductase converts 7-DHC into cholesterol, which is essential for proper embryonic development and the formation of healthy skin, bones, and other tissues.

#1: Vitamin D production—The most well-established role is that 7-DHC serves as the raw material for vitamin D3 synthesis when exposed to UVB sunlight (Photochem Photobiol Sci, 2022; Nutrients, 2024). Research shows this process works similarly across age groups; baseline skin levels of 7-DHC do not significantly differ between younger and older adults, and both age groups show comparable vitamin D3 responses to sun exposure (Nutrients, 2024). #2: Developmental importance—In fetal development, cholesterol produced from 7-DHC is critical for normal morphogenesis and skeletal and skin formation (Biochim Biophys Acta, 2000). This is evident from rare genetic disorders where defects in 7-DHC metabolism cause congenital malformations and skin abnormalities.

#3: Light sensitivity in genetic disease—In the rare genetic condition Smith-Lemli-Opitz syndrome, where 7-DHC accumulates to abnormal levels due to enzyme deficiency, the excess 7-DHC activates nerve channels (TRPA1 and TRPV1) involved in pain and itch sensation, causing painful and itchy photosensitivity when exposed to light (Pain, 2017). This is a disease-specific effect tied to pathologically high 7-DHC levels, not normal skin levels. The sources provided focus on 7-DHC’s role in vitamin D production and its importance in development and rare diseases. Claims about benefits for cosmetic skincare applications are not supported by these research abstracts.

💧 Skin Type Compatibility

⚠️ Don’t Combine With

🧴 Products Containing 7-DEHYDROCHOLESTEROL

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Waterham HR et al. (2000). Biochemical and genetic aspects of 7-dehydrocholesterol reductase and Smith-Lemli-Opitz syndrome. Biochim Biophys Acta.
• Babes A et al. (2017). Photosensitization of TRPA1 and TRPV1 by 7-dehydrocholesterol: implications for the Smith-Lemli-Opitz syndrome. Pain.
• Han Y et al. (2025). Advances in biosynthesis of 7-Dehydrocholesterol through de novo cell factory strategies. Bioresour Technol.
• Borecka O et al. (2024). Comparative Study of Healthy Older and Younger Adults Shows They Have the Same Skin Concentration of Vitamin D(3) Precursor, 7-Dehydrocholesterol, and Similar Response to UVR. Nutrients.
• Borecka O et al. (2022). A newly developed and validated LC-MS/MS method for measuring 7-dehydrocholesterol (7DHC) concentration in human skin: a tool for vitamin D photobiology research. Photochem Photobiol Sci.