For anyone frustrated by sparse, thin, or over-plucked eyebrows, a dedicated growth serum could be the solution. These targeted treatments promise to strengthen hair, improve condition, and encourage growth, often with just a simple daily application. After extensive testing over several months, we have identified the top eight products that genuinely deliver results.
What Affects Eyebrow Growth?
To understand how these serums work, we consulted Dr Bessam Farjo, a renowned hair transplant surgeon and co-founder of the Farjo Hair Institute. He explained that eyebrow thinning or loss can stem from various internal and external factors.
"Internally, thyroid dysfunction is a classic culprit, alongside hormonal shifts during menopause or pregnancy," Dr Farjo states. "Nutritional deficiencies, particularly in iron, vitamin D, and B12, can also arrest growth. Environmentally, the most common cause is undoubtedly over-grooming – years of plucking can damage the follicle permanently, a condition we call traction alopecia."
How Do Eyebrow Serums Work?
Dr Farjo notes that effective serums generally fall into two categories. Some are formulated with active ingredients designed to stimulate new hair growth from the root. Others focus on improving the quality, thickness, and density of existing hairs, which creates the illusion of fuller brows.
He cites Minoxidil as the pharmaceutical "gold standard" for stimulating follicles but advises consulting an expert before use. For over-the-counter options, he recommends looking for peptides that support keratin production. "Natural oils like castor oil and argan oil are excellent for conditioning; however, they do not physically grow new hair – they simply coat existing hairs, preventing breakage and making the brow appear fuller and healthier."
Consistency is key: Dr Farjo emphasises that results typically become visible after two to three months of daily use and will only last as long as you continue the regimen.
Our Top Eyebrow Serum Picks for 2026
After rigorous testing, assessing ease of application, ingredient efficacy, and visible changes in thickness and length, here are our top eight recommendations.
1. Best Overall: Dose Brows
This personalised serum requires an online consultation, as its potent formula contains 5% Minoxidil and 0.03% bimatoprost, ingredients clinically proven to stimulate follicles and extend the hair growth phase. Our tester saw a noticeable improvement in hair length and overall density within just under four weeks. It's a significant investment at £82 for 4ml, but the results are compelling.
2. Best Budget: The Ordinary Multi-Peptide Lash and Brow Serum
Priced at an accessible £14, this serum uses a blend of four peptide complexes to support hair health. Its fine, pinpoint brush allows for precise application. While results are subtle rather than dramatic, it effectively softened hairs and improved their overall appearance, offering excellent value.
3. Best Applicator: Blink Brow Bar Brow Boost
This £55 serum stands out for its functional spoolie brush applicator, which evenly distributes its nourishing formula containing biotin, caffeine, and natural oils. It excelled at improving the condition of existing hairs, leaving brows looking fuller and healthier, particularly after treatments like brow lamination.
4. Best for Improving Hair Condition: Kosas GrowPotion
With its wide, angled doe-foot applicator, the £30 Kosas serum makes coverage easy. Its blend of peptides and vegan keratin is designed to fortify hair. Our tester observed a marked improvement in the condition and slight fullness of existing hairs after six weeks, though new growth was minimal.
5. Best for Mature Skin: RevitaBrow Advanced Eyebrow Serum
Costing £69, this serum from the makers of Revitalash focuses on combating visible signs of ageing in brow hair. Its BioPeptin complex aims to improve hair condition rather than promote new growth. After ten weeks of use, brows felt fluffier and looked fuller, though patience is required.
6. Best Luxury: Augustinus Bader The Eyebrow and Lash Enhancing Serum
The most expensive option at £125, this 8ml serum features a unique flat applicator and a formula rich in biotin and hyaluronic acid. It is a multi-purpose product for brows and lashes. While no significant new growth was noted, eyebrow hairs felt thicker and healthier by the nine-week mark.
7. Best Value for Money: Mavala Double Brow
For less than £21, this 4.5ml serum offers a wand with micro bristles for even application and shaping. It contains plant-based exosomes and resurrection plant extract. It made hairs softer, thicker, and easier to manage, representing solid value for money.
8. Best for Sparse Brows: UKBrow Eyebrow Growth Serum
Priced at £38, this serum uses peptides and panthenol to strengthen hairs and encourage keratin production. After six weeks of daily use, our tester saw a noticeable improvement, particularly in filling sparse gaps, resulting in a fuller appearance that required less makeup.
How We Tested
Our testing process over several months evaluated each serum on four key criteria: the design and ease of the applicator; the efficacy of the formula based on its ingredients; the visible results in terms of length, thickness, and overall appearance; and the overall value for money. This hands-on approach ensured a fair and thorough assessment of every product.
