Well, I've actually been looking at using more natural oils in my haircare and skincare routine, and so I started using the Oil Cleansing Method a few weeks ago. The oils I use are Castor Oil (about 80%) thinned with a litte Pure Jojoba Oil. Well, I've always had one beautiful perfect thick totally filled in eyebrow and one eyebrow that I had to work harder to shape because it was not as thick and full as the other brow. Since I've been using the oil cleansing method I noticed the problem brow with the thinner sparse hair grew in thick and full and now perfectly matches my other brow .....I noticed this but didn't make the connection with the Castor Oil.... until I did a search for coconut oil and purely by cahnce saw where a few people posted that their eyebrow ladies had told them to put Castor Oil on their brows at night to fill in sparse areas! I wasn't trying to grow in my eyebrow just cleaning my face with the Oil Cleansing Method but I think castor Oil grew in my eyebrow hair thicker and filled in my problem brow! weird: