Coconut oil has been used for hair treatment in coconut producing countries such as India and the Philippines for thousands of years. Studies in India have been done on how effective various oils are on treating damaged hair. The study compared mineral oil, sunflower oil, and coconut oil because these were the three most commonly used oils in hair treatment products used in India. The aim of this study was to cover different treatments, and the effect of these treatments on various hair types using these three oils. The number of experiments to be conducted was a very high number, and a technique termed as the "Taguchi Design of Experimentation" was used. Their results:

The findings clearly indicate the strong impact that coconut oil application has to hair as compared to application of both sunflower and mineral oils. Among three oils, coconut oil was the only oil found to reduce the protein loss remarkably for both undamaged and damaged hair when used as a pre-wash and post-wash grooming product. Both sunflower and mineral oils do not help at all in reducing the protein loss from hair. This difference in results could arise from the composition of each of these oils. Coconut oil, being a triglyceride of lauric acid (principal fatty acid), has a high affinity for hair proteins and, because of its low molecular weight and straight linear chain, is able to penetrate inside the hair shaft. Mineral oil, being a hydrocarbon, has no affinity for proteins and therefore is not able to penetrate and yield better results. In the case of sunflower oil, although it is a triglyceride of linoleic acid, because of its bulky structure due to the presence of double bonds, it does not penetrate the fiber, consequently resulting in no favorable impact on protein loss. (Rele AS, Mohile RB. "Effect of mineral oil, sunflower oil, and coconut oil on prevention of hair damage." Journal Cosmetology Science 2003 Mar-Apr;54(2):175-92.)