The sun’s UV rays don’t only affect the skin: they can also damage hair, making it drier, rougher, and more brittle. While sunscreen protects our skin, what about protection for our hair? Coconut oil, known for its nourishing properties, is sometimes presented as a natural shield against environmental stressors. But can it really protect your hair from the sun? Let’s find out.
Coconut oil to protect hair from the sun?
Summary
Published on March 13, 2026, updated on March 13, 2026, by Andjela, Chemical Engineer — 5 min of reading
Coconut oil as a natural hair care solution against UV rays?
When hair is exposed to the sun, it is common to observe the appearance of lighter highlights or a slight natural lightening, often associated with summer. However, behind this aesthetic effect lie chemical changes within the hair fiber. UV rays can interact with hair proteins, particularly keratin, and trigger the oxidation of certain amino acids. This photodegradation gradually weakens the structure of the hair and can alter the disulfide bonds that provide its mechanical strength. In addition, UV exposure promotes the formation of free radicals, which are responsible for oxidizing hair pigments and degrading the protective lipids present in the cuticle. Over time, these processes can lead to hair that is drier, duller, and more fragile.
Many people have understood that it is important to protect their hair from summer-related damage and therefore turn to plant-based oils, particularly coconut oil.
Used for a long time in traditional hair care, coconut oil is valued for its nourishing and protective properties. Its high content of medium-chain triglycerides, particularly lauric acid, gives it a specific affinity for the hair fiber. Unlike some vegetable oils that remain mainly on the hair surface, coconut oil can penetrate relatively easily into the hair fiber, allowing it to act within the cortex rather than only at the cuticle level.
An experimental study examined the ability of different fatty acids to penetrate color-treated hair and protect the hair fiber. The researchers compared hair treatments containing medium-chain fatty acids (C8, C10, and C12), long-chain fatty acids (C14, C16, and C18), as well as coconut oil and oil rich in medium-chain triglycerides (MCT). The results showed that medium-chain fatty acids penetrated the hair fiber significantly better than long-chain fatty acids. Coconut oil, which is rich in lauric acid (C12), showed a penetration capacity comparable to that of MCT oils. This increased penetration helps to partially fill the microcracks in the hair fiber and reduce protein loss, thereby helping to increase the mechanical strength of the hair.
Electron microscopy images of untreated hair (VH) and bleached hair (BH) before and after 21 days of treatment with fatty acid–rich oils.
Source: AHN C. & al. Determination of penetration and protection of fatty acids in bleached hair according to the fatty acid chain length and the application to understanding the protective effects of MCT oil and coconut oil. Fashion and Textiles (2023).
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Moreover, some studies have also suggested that coconut oil has a low photoprotective capacity, with an SPF ranging from 1 to 7. This indicates that it can absorb a small portion of UV rays, but this protection remains very limited compared to that provided by conventional sunscreen filters.
7.119
SPF of coconut oil determined in vitro by CHAUHAN et al.
1.2
SPF of coconut oil determined in vivo by MARTINIAKOVA et al.
0.004
SPF of coconut oil determined in vitro by MARTINIAKOVA et al.
That said, no scientific study to date has demonstrated that coconut oil can actually protect hair from damage caused by sun exposure. While its emollient properties and its ability to penetrate the hair fiber may help nourish the hair and reduce dehydration, these effects do not constitute reliable protection against UV radiation. To preserve the health of the hair fiber during periods of intense sunlight, other protective measures remain essential.
Tips for protecting your hair from the sun.
Wear a hat, a cap, or a scarf for physical protection.
Use hair care products that contain UV filters, specially formulated to protect the hair fiber.
Avoid exposing yourself with wet hair, which is more fragile.
Regularly apply nourishing and restorative treatments to compensate for lipid loss and maintain hair hydration.
Limit prolonged exposure to the sun, especially during hours when UV radiation is most intense.
Sources
MOHILE R. B. & al. Effect of mineral oil, sunflower oil, and coconut oil on prevention of hair damage. Journal of Cosmetic Science (2003).
SARAF S. & al. In vitro sun protection factor determination of herbal oils used in cosmetics. Pharmacognosy Research (2010).
CHAUHAN A. & al. UV-blocking potential of oils and juices. International Journal of Cosmetic Science (2016).
MARTINIAKOVÁ S & al. The real UVB photoprotective efficacy of vegetable oils: In vitro and in vivo studies. Photochemical & Photobiological Sciences (2021).
AHN C. & al. Determination of penetration and protection of fatty acids in bleached hair according to the fatty acid chain length and the application to understanding the protective effects of MCT oil and coconut oil. Fashion and Textiles (2023).
JIANG H. & al. Penetration of oils into hair. International Journal of Cosmetic Science (2024).
