Question: what is the best product to use to fill in your eyebrows?
Answer: Best Overall: Benefit Cosmetics Gimme Brow+ Volumizing Eyebrow Gel. Benefit Cosmetics' Gimme Brow+ Volumizing Eyebrow Gel is a star. The tinted gel is made of tiny microfibers that cling to your eyebrow hairs and skin, giving the look of fullness while defining them.