We've tried some of the best lash serums around—these are the only ones we'd recommend

Get ready for compliments

Valeza after using one of the best lash serums
(Image credit: Future)

Most of the time when people are asked what their desert-island beauty product would be, the classic mascara or trusty brow product comes to mind. 

Me? Well, I’d take one of the best lash serums. I mean, aside from sunscreen—but I’d hope that’s just included in the desert island survival package. Lash serum is one of my few non-negotiables when it comes to beauty, and I’m a pretty low-key beauty journalist. It’s the one product that I've seen such a dramatic difference with, that now if I can help it, I won’t be without it. 

Recently though, people have become a bit wary of their lash serums, and that’s all down to an ingredient called prostaglandin analogues (PGAs). They work by prolonging the active (anagen) growth phase of your hair, which has 4 cycles: anagen (growth phase), catagen (transition phase), telogen (resting phase), and exogen (shedding phase). The reason they’ve got a bit of a reputation is due to sensitivity to the eye area and it's been reported that it can alter your eye colour (though this is not a common occurrence so don't panic). If either of these occur, however, stop using your serum immediately and seek medical attention if you need to.  

Now, as a Beauty Editor, I’ve been using a lash serum for about 7 years and never experienced sensitivity and have light blue eyes with no issues regarding colour changes. But everyone is different and it’s best to use what you feel comfortable with.

Luckily, not all lash serums contain PGAs, so there are plenty of options to suit more sensitive eyes. Other ingredients include peptides (a smart lash-strengthener), castor oil (a traditional ingredient commonly used to address hair growth), vitamin E (aids moisture), and keratin (to help strengthen the hair structure). 

No one formula is better than the other, it's all down to preference. PGAs give more dramatic results and are proven for hair growth, but they might not be the right choice for you. In that case peptides and other ingredients are still incredibly effective. 

Here are the lash growth serums we’ve used during our time as beauty editors and really rate. 

How we tested the best lash serums:

Over the course of my last seven years being a beauty editor, I've tried and tested almost every lash serum out there. Since lash serums can take weeks (and even months to see results) this is a category that can be tricky to control test. My process always begins with lashes that haven't had any serum treatment for at least 2 months. Then I start using my serum just at nighttime for at least 8 weeks, sometimes more if the brand recommends a longer results time. I don't use any other products on my eyelashes, but I try not to tug and pull as much as I can and avoid waterproof mascara where I can (as removal can be harsh on precious lashes). 

I've also enlisted the help of Valeza Bakolli, MCUK's Junior Shopping editor (and a fellow lash serum lover) to give her honest thoughts and recommendations. As a Shopping Editor, Valeza tests a LOT of new beauty products on a regular basis, so she's trialled a fair few lash serums in her time. She also has pretty sensitive skin, so tends to avoid potentially irritating ingredients (like PGAs) - preferring a more natural formula that still strengthens, lengthens and thickens her lashes.

1. Revitalash Advanced Sensitive Eyelash Conditioner

Revitalash Advanced Sensitive Eyelash Conditioner

(Image credit: Revitalash)

Revitalash Advanced Sensitive Eyelash Conditioner

Best luxury lash serum

Reasons to buy

+
You want fast growth 

Reasons to avoid

-
It's really expensive

"This is my ride or die and the most expensive beauty product I’ll regularly buy. It contains PGAs and this formula is a special sensitive one to avoid any irritation that might occur. I find that this is the quickest, most effective way of getting length from my lashes. Like most hair growth treatments though, be warned that the effects will wear off as soon as you stop using it." - Tori Crowther, Beauty Editor 

2. Glow For It Lash Growth Serum

glow for it lash serum

(Image credit: Beauty Bay)

Glow For It Lash Growth Serum

Best natural lash serum

Reasons to buy

+
Natural ingredients
+
Great for sensitive eyes

Reasons to avoid

-
Doesn't work quite as quickly as serums using PGAs

"I’ve been using Glow For It for around 8 weeks now and have noticed a genuine difference in the length and density of my lashes. It contains no PGAs (a dream for my sensitive eyes), instead using natural ingredients, which provide vitamins and nutrients to stimulate the hair follicle and promote growth." - Valeza Bakolli, Junior Shopping Editor

3. Hairburst Lash and Brow Serum

Hairburst Lash and Brow Serum

(Image credit: Look Fantastic)

Hairburst Lash and Brow Serum

Best lash serum for brows

Reasons to buy

+
You want a PGA-free formula

Reasons to avoid

-
You don't want to use a small brush applicator

"One of the more affordable on the list but one that still yields impressive results is this. The applicator for this is a little different and is great if a teeny-tiny brush applied to the lash line (as you would an eyeliner) is a bit intimidating and you’d rather a wand. This is ideal if you don’t want a PGA-based serum." - Tori Crowther, Beauty Editor

4. RapidLash Eyelash Enhancing Serum

RapidLash Eyelash Enhancing Serum

(Image credit: Look Fantastic)

RapidLash Eyelash Enhancing Serum

Best lash serum for long-term use

Reasons to buy

+
You're after quick results 

Reasons to avoid

-
You don't want PGAs 

"Much more affordable than Revitalash but still utilising PGAs for rapid lash growth (get it). I don’t think this one works as fast but definitely does what it promises in promoting longer, fuller-looking lashes. It has the same thin brush wand as Revitalash to get precise application." - Tori Crowther, Beauty Editor

5. UKlash Eyelash Serum

UKlash Eyelash Serum

(Image credit: UKlash)

UKlash Eyelash Serum

Best strengthening lash serum

Reasons to buy

+
You want a smart formula 

Reasons to avoid

-
You want incredibly quick growth 

"This formula truly can turn the shortest of lashes into lengthened beauties. Containing PGAs and peptides, it works to both grow sparse lashes and strengthen and care for existing ones. Give it at least two months to see some difference and around four months to see significant change. The formula (plus price tag) is the reason I recommend this product a lot." - Tori Crowther, Beauty Editor

6. The Ordinary Multi-Peptide Lash and Brow Serum

The Ordinary Multi-Peptide Lash and Brow Serum

(Image credit: Look Fantastic)

The Ordinary Multi-Peptide Lash and Brow Serum

Best affordable lash serum

Reasons to buy

+
You want an affordable formula

Reasons to avoid

-
You want dramatic results 

"One of the newest of the bunch—and also the cheapest—it uses peptide technology to make lashes and brows appear fuller after a few weeks of use. This serum definitely doesn’t give as dramatic results as the rest, and needs regular use for a good few months to see those fluttery lashes. But it still works a treat." - Tori Crowther, Beauty Editor