I have been using castor oil for years, and it is fantastic!!
I use it for my eyelashes, and as everyone says here, it works great!!
I also use it in my hair. I have dark brown hair, and I read somewhere that it helps with hair loss - a few years ago I started to lose hair and tried this. It really worked with some hair growth. What I also noticed, is it slowed down my grey hair and spread out the length of time I could go in between getting my hair color done. Now, I'm 42 and really don't have a lot of grey hair at all, just at the sides, and I swear castor oil is a miracle worker for grey hair. However, you can't use it if you have light hair as it can darken your hair. Being a dark brunette I am lucky. I rub it in my scalp at night and wash it in the morning. You get used to it, and it's well worth the stickiness!!!!
It's also a fantastic moisturizer for eyes (less is more).
The best part - it is incredibly inexpensive