See Why These 5 Eyebrow Serums Have Over 1,000 Reviews on Amazon

The Product: Rapidlash Eyelash Enhancing Serum ($30)

The Rating: 4 stars, over 1,100 reviews

Why People Love It: Although this serum was made for eyelashes, it can also be used on brows. This reviewer loved what it did for her: "I've been using it for a year or so on my eyelash line and eyebrows, and it continually keeps them growing better and fuller than they ever did before."