Brows that used to be full have a way of quietly thinning out. Years of plucking, a few birthdays, a stressful season or simply genetics can leave the tails sparse and the arches patchy. Brow pencils and gels fill the gaps for a day, which is why so many people go looking for a serum that actually helps the hairs themselves.
The trouble is that eyebrow serums are not all the same product in different packaging. Some are built around a prostaglandin analog, an ingredient borrowed from eye medicine. Others rely on peptides, amino acids and botanicals instead. Prices range from about fifteen dollars to well over a hundred. We compared six of the best-known brow serums by what is actually on the ingredient list, what they cost per milliliter and who each one suits, so you can choose with confidence.
Quick answer: our top pick is Shigeru Lash & Brow Growth Serum. It is the prostaglandin-free formula our salon lash artists use every day, it works on brows and lashes, it is gentle enough for sensitive eyes and it is safe with extensions. Read on to see how it compares.
Quick comparison
| Serum | Key ingredients | Prostaglandin analog | Size and price* |
|---|---|---|---|
| Shigeru Lash & Brow Growth Serum | Ten amino acids, Fo-Ti, Blue Lotus | No | 5 ml, $69 |
| GrandeBROW Brow Enhancing Serum | Amino acids, hyaluronic acid, botanicals | Yes (isopropyl cloprostenate) | 3 ml, $38 |
| RapidBrow Eyebrow Enhancing Serum | HEXATEIN 2 complex, peptides, biotin | Yes (isopropyl cloprostenate) | 3 ml, $34.95 |
| RevitaBrow Advanced Eyebrow Conditioner | Biotin, peptides, botanicals | Yes (cloprostenol ethyl amide) | 3 ml, $111 |
| Vegamour GRO Volumizing Brow Serum | Red clover and mung bean extract, peptide | None listed | 3 ml, $68 |
| The Ordinary Multi-Peptide Lash and Brow Serum | Four peptides, caffeine, panthenol | None listed | 5 ml, $14.90 |
*Brand or major retailer list prices in October 2026. Prices and formulas change, so check the current label before you buy.
Two kinds of brow serum, and why it matters
Almost every brow serum on the market falls into one of two families.
Prostaglandin analog serums. These contain a lab-made ingredient related to the active in certain prescription glaucoma eye drops, where longer, darker lashes were first noticed as a side effect. In cosmetic serums it usually appears as isopropyl cloprostenate or a similar name. These ingredients are well known for visible results, and many people use them happily. Some people prefer to avoid them, though, because they can cause irritation, redness or darkening of the skin where they are applied in some users. If you have sensitive eyes, are pregnant or breastfeeding, or are under an eye doctor's care, it is worth asking your doctor before using one.
Prostaglandin-free serums. These rely on ingredients that nourish and condition the hair and the skin it grows from, such as amino acids, peptides, panthenol and plant extracts. They tend to be gentler and are a common choice for sensitive skin, extension wearers and anyone who simply wants a simpler formula. Results build steadily with consistent use.
For most people, and especially anyone with sensitive eyes, lash extensions or mature skin, we recommend starting with a prostaglandin-free serum. It is the gentler route, and a well-formulated amino acid serum used consistently still delivers visibly fuller brows.
The 6 best eyebrow growth serums
1. Shigeru Lash & Brow Growth Serum: best overall
Our own serum was developed for the lash artists in our salons, who wanted something they could recommend to every client, including those with sensitive eyes and those wearing extensions. It is a prostaglandin-free blend of ten amino acids, the building blocks of the keratin that brows are made of, with Fo-Ti, a botanical long used in traditional Asian hair care, and soothing Blue Lotus flower extract.
- Why it is our top pick: it nourishes and strengthens brows and lashes in one product, without a prostaglandin analog. It is oil-free, so it is safe with lash extensions, and vegan, paraben-free and cruelty-free.
- Salon proven: it is the serum our own lash artists reach for every day, recommended to clients who want stronger natural brows and lashes.
- Gentle enough for sensitive eyes: we have used it on hundreds of salon clients with no reported reactions.
- Results: used morning and night, most people see visibly fuller brows in about 30 days, with the fullest results at around 60.
- Value: a full 5 ml bottle, more than most premium serums here, lasts 60 days at $69, or about $1.15 a day.
Best for: anyone who wants gentle, visible results for both brows and lashes. See Shigeru Lash & Brow Growth Serum.
2. GrandeBROW Brow Enhancing Serum: best value prostaglandin formula
GrandeBROW pairs a prostaglandin analog with amino acids, hyaluronic acid and botanical extracts such as ginseng and chamomile. Grande says to expect results in six to eight weeks, with full improvement at four months, and describes its products as PETA certified cruelty-free.
Best for: people comfortable with prostaglandin analogs who want a well-known formula at a moderate price.
3. RapidBrow Eyebrow Enhancing Serum: easiest to find
RapidBrow is sold at many drugstores and beauty retailers. Its formula combines the brand's HEXATEIN 2 complex, peptides, biotin and panthenol with isopropyl cloprostenate. The brand cites a consumer study showing thicker, fuller-looking brows in eight weeks.
Best for: shoppers who want a widely available prostaglandin formula at a lower price point.
4. RevitaBrow Advanced Eyebrow Conditioner: premium prostaglandin option
RevitaBrow Advanced blends biotin, peptides and botanical extracts including green tea and ginseng with a prostaglandin analog listed as cloprostenol ethyl amide. It is the most expensive serum here at $111 for 3 ml, with a smaller 1.5 ml size for $60.
Best for: people who prefer a long-established luxury brand and do not mind the price.
5. Vegamour GRO Volumizing Brow Serum: best plant-based alternative
Vegamour builds its brow serum around red clover and mung bean sprout extract with acetyl tetrapeptide-3. No prostaglandin analog appears on its ingredient list, and the brand describes it as vegan, gluten-free and cruelty-free.
Best for: people who want a botanical, plant-forward formula.
6. The Ordinary Multi-Peptide Lash and Brow Serum: best budget pick
At under fifteen dollars for 5 ml, this is the least expensive serum on our list. It uses four peptides with caffeine, panthenol and red clover extract, with no prostaglandin analog listed, and is labeled vegan and cruelty-free.
Best for: anyone who wants a low-cost way to try a peptide serum before committing to a more targeted formula.
Which eyebrow growth serum actually works?
The short answer is the one you use consistently, on brows that still have healthy follicles. Any serum on this list needs daily use for at least a couple of months before you can judge it. Be wary of any product that promises dramatic change in days. Look instead for a clear ingredient list, a realistic timeline of one to three months and directions you can stick with. Photos taken every two weeks in the same light are the most reliable way to tell whether a serum is working for you. With Shigeru, most people see visibly fuller brows in about 30 days and the fullest results at around 60.
The best eyebrow serum for older women
Brows naturally thin with age, often starting at the outer tails, as hair growth cycles slow and hormones shift. Skin around the eyes also tends to become drier and more sensitive over time. For mature brows, a gentle, prostaglandin-free formula such as Shigeru is the best place to start, paired with less plucking and a few minutes of brushing each day. Our guide to why eyebrows thin after 40 explains the common causes in more detail.
How to choose the right brow serum
- Read the ingredient list first. Decide whether you are comfortable with a prostaglandin analog. If you are not sure, start with a prostaglandin-free formula.
- Think about your eyes and skin. If your eyes water easily or your skin reacts to new products, choose a gentle, prostaglandin-free serum and patch test it behind your ear or on your inner arm for a couple of days.
- Consider extensions and brow treatments. If you wear lash extensions, an oil-free serum will not weaken the adhesive. After microblading or a brow tattoo, wait until the area is fully healed and check with your artist before applying anything new.
- Compare cost per day, not per bottle. Bottle sizes and directions vary, so a cheaper bottle is not always the better value.
- Choose something you will use every day. Consistency matters more than any single ingredient.
How to apply brow serum for the best results
- Start clean. Wash your face and pat your brows dry. Serum works best on skin without makeup, oil or residue.
- Apply to the skin, not just the hairs. Brush the serum through your brows so it touches the skin beneath them, focusing on sparse areas and the tails.
- Use a light hand. One thin stroke per brow is plenty. More product does not mean faster results.
- Let it dry. Wait two to three minutes before applying brow gel, pencil or other makeup.
- Follow the directions. Some serums are used once a day and some twice. Stick with the routine on the label.
- Put the tweezers away. Let thin areas grow in while you use a serum. Shape only stray hairs well outside your brow line.
Take a photo in the same spot and the same light every two weeks. Brow changes are gradual, and photos make progress much easier to see.
What results to expect
Brow hairs grow slowly and follow a cycle of several months, so no serum works overnight. Most people need at least four to eight weeks of daily use to see a visible difference, and a few months for the full effect. Results also fade gradually if you stop, as brows return to their natural cycle.
A serum works best on hairs that are thin, short or breaking. It cannot bring back follicles that have been damaged by years of heavy plucking, waxing or scarring. If your brows are thinning quickly, falling out in patches or thinning along with your scalp hair, see your doctor, since thyroid changes, nutritional issues and conditions such as alopecia areata can all affect brows. If you are shopping for someone else, our guide to how men can get thicker eyebrows covers grooming habits that help.
Our verdict
If you want one serum that is gentle, prostaglandin-free, safe with extensions and works on both brows and lashes, Shigeru Lash & Brow Growth Serum is our top pick. It is the formula our lash artists trust on their own clients, and most people see visibly fuller brows in about 30 days, with the fullest results at around 60.
If you are comfortable with prostaglandin analogs and want a lower price, GrandeBROW and RapidBrow are popular options. Vegamour suits plant-focused shoppers, and The Ordinary is an inexpensive way to try a basic peptide serum.
Shop Shigeru Lash & Brow Growth Serum
Brow serum FAQs
Can I use a lash serum on my brows?
Often, yes. Lash and brow hairs are similar, and many serums, including ours, are made for both. Always check the directions on your product first.
Are eyebrow serums safe?
Most people use brow serums without any problems. As with any product used near the eyes, stop using it if you notice irritation, redness or swelling. If you are pregnant, breastfeeding or being treated for an eye condition, check with your doctor before starting any serum.
Can I use brow serum after microblading?
Wait until the treated area has completely healed, then ask your brow artist. Some ingredients can affect how pigment settles in the first few weeks.
How long should I try a serum before switching?
Give any serum at least eight weeks of consistent daily use before deciding whether it works for you.
Want more lash, brow and skincare tips? Follow us on Instagram at @shigerubeauty for new guides and tips as we publish them.
This article is for general information and compares publicly listed ingredients and prices. Brand names belong to their respective owners. If you have ongoing brow loss or irritation, please speak with your doctor.
The Shigeru Beauty Team