Yes, it is possible to use 100% refined coconut oil on your hair. Coconut oil has many benefits for hair, including helping to reduce protein loss, providing a protective layer for the scalp, and helping to condition and nourish the hair. It is also known to reduce dandruff and help to protect hair from damage caused by heat styling. However, it is important to use the oil in moderation, as it can be very heavy and can weigh down your hair if used in large amounts.