Aloe Vera Gel
Aloe vera gel is a proven remedy for thickening eyebrows. It not only boosts hair growth, softens and adds shine to skin around the brow, but it also keeps your eyebrow hairs in place. Take a cut off piece of an aloe leaf, wipe a mascara brush in it to get the gel, and apply the gel to your eyebrows. You can do this once a day.
[Photo via @skerlyg]