Castor oil is really beneficial for our health due to the fact that it contains many essential nutrients.
The best thing about castor oil is that it is really cheap and that many hair and skin problems can be solved with castor oil. Many people avoid using it because it is sticky and thick.
It can be really hard to apply the castor oil directly on the hair and that is why it is important to dilute it before using it. All you will need to do is to mix the same amounts of coconut oil and castor oil and you have your own hair mask. Now you should apply it on your scalp and to leave it like that for about an hour so it can act.Do this carefully and apply it evenly. This method should be done twice in a week before you are going to wash your hair.

A treatment that is really effective for eliminating dry hair split ends is the following:
On your palm take 2 to 3 drops of castor oil and apply it on the dry and fizzy hair before going to bed at night and leave it during the night.

Source: http://www.healthyandnaturalsolution.com/one-oil-will-stop-hair-fall-grow-thick-long-hairs-just-10-days-time/