USDA Certified Organic Castor Oil for eyelashes and eyebrows growth. If you’re looking for a natural and organic oil to grow your eyelashes and eyebrows, Kate Blanc Cosmetics organic castor oil is a Godsent. Kate Blanc Cosmetics Castor Oil is organically grown and cold pressed with no added preservatives. Because it’s 100% pure, it easily absorbs into your lashes and brows to boost hair growth.