This Serum Gave Me Longer, Fuller Brows in Just Two Weeks (2025)

Here’s how it works: “A dermatologist can prescribe the medication, which can be applied to the eyebrows once a day for 16 weeks to promote hair growth,” says Michele Green, MD, a board certified dermatologist in New York City. It can take up to four months, she adds, to see a difference.

Our testers are big fans, and they saw results quicker than a few months—in fact, some noted fuller and darker brows within just a few weeks. “I used to color my light brown brows every day, but they’ve become much darker in just three weeks,” says Glamour contributor Brigitt Earley. “The whole process has been really simple to incorporate into my before-bed routine too.” It’s easy to use—just add a drop of the solution on to the applicator wand and brush it on your lashes, then brush any remaining solution on to your brows.

6. Best for Sensitive Skin: Vegamour GRO Volumizing Brow Serum

• What we love: Natural and vegan formula; dries clear
• What could improve: Should be used twice per day for best results
• Key ingredients: Trifolium pratense/vigna radiata extract, acetyl tetrapeptide-3
• Application frequency: Twice per day
• Who it’s best for: Clean beauty fans

Thanks to Vegamour, natural beauty stans can reap the brow-boosting benefits of serums. It may be formulated with only clean, vegan ingredients, but users say it really works. And derms tell Glamour they like that it’s packed with nourishing and stimulating ingredients such as active phytomolecules, biotin, and zinc.

“I bought this because I had once plucked my eyebrows pencil thin. After just a few weeks, my eyebrows are visibly thicker,” says one user, who adds she chose the product because it goes on clear and didn’t run the risk of tinting her skin.

7. Best for Extension Damage: Sweed The Brow Serum

• What we love: Free from harsh ingredients; nutrient-dense formula; vegan and cruelty-free
• What could improve: Applicator could have a thicker brush
• Key ingredients: Peptides, biotin, pumpkin seed oil
• Application frequency: Once a day, preferably at night
• Who it’s best for: Those who prefer a gentle formula

Sweed’s The Brow Serum uses a combination of powerhouse ingredients like peptides, biotin, and pumpkin seed oil, along with vitamins, to give your brows a thicker look and help reduce sparse areas. “It enhances the overall appearance of brows by stimulating growth while still being gentle on the skin,” says celebrity makeup artist Caitlyn Dominic. “I also appreciate that it is vegan and cruelty-free.” This product gets to work fast with noticeable results after about four to six weeks of nightly use. Just be sure to allow a couple of minutes for the product to dry down and absorb before applying any other creams or serums to reap the maximum benefits of its ingredients.

8. Best for Patchy Brows: Obagi Medical Nu-Cil Eyebrow Boosting Serum

• What we love: Improves brow fullness; easy to apply; suitable for all skin types
• What could improve: Slightly more expensive
• Key ingredients: Panthenol, biotin, sodium hyaluronate
• Application frequency: Once a day
• Who it’s best for: Anyone who overtweezed their brows