Castor Oil Challenge: Thicker Eyebrows

For the past couple of years I have been trying to get one of my eyebrows to grow in thicker.  My brows aren't too thin, but I like thick brows and I have one that is fairly thinner than the other.  It seems no matter what I try, my one brow will not grow in so I've had to use various powders and pencils to fill it in and get it to match my other brow.  

I've tried numerous brow products such as, Hydropeptide and Obagi, but they didn't make much of a difference in my brow growth. Lately, I've been hearing a lot about Castor Oil and it's ability to help grow in lashes and brows so I've decided to give it a shot since nothing else has worked for me.  I bought my bottle of Castor Oil from Whole Foods.  I started my Castor Oil Challenge last night and am planning on applying it once a day, right before bed.  I use a q-tip to dab a small amount to the sparse areas in the brow that I am trying to grow thicker.  I'll report back in about 8 weeks to ensure that I've given it enough time to work.  Let me know if you have had any experience with Castor Oil and how it worked for you.