It's been a year since I started using JBCO on my hairline. Here are my results! You can purchase Jamaican Black Castor Oil on Amazon.com and YES it works on Caucasian hair! for Caucasian hair textures it's recommended that you apply over night and then wash out the next morning since it is a heavy oil and would most likely be too much for your hair type.
More on the benefits of Castor Oil: http://en.wikipedia.org/wiki/Castor_oil
Full Disclosure: This product is linked using Amazon's affiliate link program. I have not been paid to endorse JBCO and have purchased it on my own accord.