Coconut oil works as a conditioner as well as a moisturizer and is great for improving blood circulation. The fatty acids found in coconut oil work with the natural proteins found in hair to protect it from breaking The lauric acid present in it acts as an antimicrobial agent, preventing infection of hair follicles. The various proteins as well as nutrients like vitamin E and iron in coconut oil promote healthy and thick eyebrows. You can apply coconut oil on your eyebrows every day, but using it even a few times a week can have noticeable results.