★★★★★4.8 · 237 reviews
In stock
With RADILAX-4 Hair Complex

Eyelash & Eyebrow Serum

Peptide technology without prostaglandins: strengthens hair roots, densifies, and intensifies natural pigmentation. First results after 4 weeks – fully visible after 8 weeks.

Without prostaglandins or analogues
Promotes longer and thicker lashes
Strengthens and reduces hair breakage
Enhances natural pigmentation
Introductory discount — ends
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30DAYS
30 Day Money-Back Guarantee
We are so confident in our products. But if you're not thrilled, send it back and we'll refund the full purchase price. No questions asked.
What is Feel1 Lash & Brow Serum and what makes it special?

A highly effective serum with state-of-the-art peptide technology and botanical extracts. It strengthens hair roots, improves natural density, and promotes the length of lashes and brows – entirely without prostaglandins.

Who is it suitable for?

Ideal for thin, weak, over-plucked, short, or slow-growing lashes and brows. Suitable for all ages and skin types – safe for sensitive eyes and contact lens wearers.

How is it applied?

Apply a fine line once daily along the upper lash line and to the brows – on clean, dry skin. Allow 2–3 minutes for absorption. Initial results are usually visible after 4 weeks, fully visible after 8 weeks.

How much is shipping?

Free shipping on qualifying orders.

Free shipping on qualifying orders
Free shipping on qualifying orders.
30-day guarantee
Free returns. Full refund. No questions asked.
Dermatologically tested
Developed with experts, manufactured in GMP/ISO certified facilities.
Gentle care formula
Without prostaglandins & hormones. Cruelty-free and ideal for sensitive eyes.
Here's what's inside

Four active ingredients. No prostaglandins.

Polypeptide complex
Polypeptide complex
Activates follicles — for visibly more density
Hyaluronic acid
Hyaluronic acid
Intense moisture, less hair breakage
Vitamin B & Biotin
Vitamin B & Biotin
Keratin activation for strong hair
Centella Asiatica
Centella Asiatica
Botanical extract for uniform growth
7
Years of experience in cosmetics
+15000
Lash & brow transformations
97%
Customer satisfaction
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RADILAX-4™— four actives, one target: the root.

Lashes do not grow from the tip. Every hair sits in a follicle with its own growth cycle, and that cycle shortens with age, with makeup, and with years of extensions.

01
Polypeptide Complex
activates the follicle and extends the growth phase
02
Hyaluronic Acid
hydrates each individual hair, so less of it breaks
03
Biotin & Vitamin B
supplies the keratin the hair is built from
04
Centella Asiatica
evens out growth, so gaps close

Over 15,000 lash & brow transformations

4.8 / 5
Based on 237 reviews
Sabrina K.Used for 5 weeks
Sabrina K., 34
Thin Lashes & Brows
★★★★★

After 5 weeks, my lashes are significantly stronger and longer. My brows also look fuller and healthier.

Julia M.Used for 2 weeks
Julia M., 30
Irregular Lashes
★★★★★

After just 2 weeks, my lashes look fuller and have more volume. I'm surprised how quickly the serum works!

Lena S.Used for 5 weeks
Lena S., 28
Sensitive Skin
★★★★★

I have very sensitive skin, but after 5 weeks, no irritation. My lashes have become longer and stronger.

Vanessa R.Used for 4 weeks
Vanessa R., 31
Thin Lashes & Brows
★★★★★

After 4 weeks, my lashes and brows are visibly denser and healthier. The serum works gently and effectively at the same time.

Monika H.Used for 8 weeks
Monika H., 40
Thin Brows
★★★★★

After 8 weeks, my brows look naturally denser and are easier to style. Finally a serum that really works!

Helga M.Used for 10 weeks
Helga M., 56
Thin Lashes Due to Age
★★★★★

My lashes were very thin and weak, but after 10 weeks they look stronger and denser. I'm thrilled!

What to expect

First results after 4 weeks. Full result after 8.

One stroke along the upper lash line every evening. That's the whole routine.

0
Illustration – start: thin lashes and sparse brows
Day 1
Start

Thin, sparse lashes & brows

Short lashes, patchy brows – the starting point most of our customers describe.

4
Illustration – week 4: slightly fuller lashes and brows
Week 4
Week 4

First visible change

Lashes a touch longer and denser, brows start filling the gaps – subtle, but you see it.

8
Illustration – week 8: fuller lashes and defined brows
Week 8
Week 8

Full result

Noticeably fuller, longer lashes and even, defined brows – still your own, just more of them.

Individual results vary. Most customers see the first change between week 2 and 4 – that's why we offer the 30-day guarantee.

Four concerns. One serum.

Developed to target the most common lash and brow concerns – with a dedicated active for every cause.

Thin lashes & brows

Peptides and plant extracts strengthen the hair roots for visibly fuller, thicker lashes and brows.

Active ingredientPolypeptide complex

Brittle & weak hair

Intensive moisture hydrates every single hair, prevents breakage and supports smooth growth.

Active ingredientHyaluronic acid

Slow growth

Active peptides combined with plant extracts stimulate hair growth – for faster results.

Active ingredientVitamin B & Biotin

Gaps & uneven growth

Targeted care with botanical extracts ensures even growth and visibly reduces sparse areas.

Active ingredientCentella Asiatica
Feel1 Eyelash & Eyebrow Serum with box

Noticeably longer, denser lashes & brows – and compliments guaranteed.

30-day money-backShips in 1–3 daysFree shipping

Frequently Asked Questions

Our customer support will help you with all your questions!Average response time: 10 hours
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Eyelash & Eyebrow Serum
4.9 / 5
★★★★★
21 verified reviews
5 ★
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★★★★★
My eyelashes are back!
I wore extensions for years and completely ruined my own lashes. After 6 weeks with this serum, they are longer and thicker than ever before. Truly shocked by how well it works.
Sophie R.
★★★★★
Eyebrows finally full again
I overplucked since my teens and my brows were barely visible. This serum filled in the gaps in less than a month. Absolutely life-changing.
Emma L.
★★★★★
The before and after is unreal
I took photos every two weeks. In week 8, the difference in density and fullness is truly undeniable. Even my husband noticed without me saying anything!
Mia K.
★★★★★
No irritation whatsoever
I have very sensitive eyes and was really nervous to try this. Zero stinging, zero redness. Just great results after a few weeks of consistent use.
Laura M.
★★★★★
So curvy and dark
I used to curl my lashes every morning. I really don't need to do that anymore. The natural curl from this serum is incredible – and the darkness too!
Zoe T.
★★★★★
Delivered quickly, fast results
Arrived in two days. Started immediately. By week three I saw tiny new hairs sprouting in my brows. Super impressed with the results.
Hannah B.
★★★★★
Applicator is just perfect
The brush makes it really easy to apply the serum precisely to the lash line. Doesn't drip into the eye. Clean formula, clean application.
Nina W.
★★★★★
Extensions finally a thing of the past
I used to spend over $150 a month on lash extensions. Stopped that and used this instead. My natural lashes are now better than extensions ever were. Saving so much money!
Chloe D.
★★★★★
My brows are really back
Decades of overplucking have left my brows very thin. After 10 weeks, they look naturally full – just like in my 20s. What this serum achieves is absolutely incredible.
Diana F.
★★★★★
Visibly effective after only 2 weeks
I was skeptical, but I tried it anyway. Within 2 weeks, I was already seeing tiny new lashes. Now, in week 5, they are noticeably longer. Simply wow.
Isabelle P.
★★★★★
No more tracing necessary
I've been drawing on my brows daily for 15 years. For the first time, I can leave the house without filling them in. I honestly cried when I realized it.
Rachel C.
★★★★★
Denser than I ever dreamed
My eyelashes have always been genetically thin and short. This serum changed that. They are now visibly thicker and longer. Everyone thinks I'm wearing false eyelashes!
Victoria J.
★★★★★
Works while I sleep
I apply it every night before bed and wake up with results. Such a simple habit. My lashes are visibly growing every week.
Amy S.
★★★★★
Gentle enough after chemo
I lost my eyelashes due to the treatment. My doctor gave the green light for this serum. After 10 weeks, they are almost completely back. Gentle, fragrance-free – and it works!
Karen H.
★★★★★
My esthetician was surprised
She asked what I was doing differently. I told her about this serum. She said the density of my brow hairs was significantly better than at her last visit.
Claire N.
★★★★★
Very good – requires some patience
For me, it took 8 weeks rather than 4. But the results are there! Brows are fuller, lashes longer. Nevertheless, very satisfied!
Olivia T.
★★★★★
Extremely productive
One bottle lasts a good 4 months for me. The applicator dispenses just the right amount. Really great value for money.
Freya A.
★★★★★
Now my mom uses it too
I shared my bottle with my mom (62), and she had equally great results. Her brows were almost gone and are coming back beautifully. We're both ordering our own now.
Jessica K.
★★★★★
Buy again and again
I'm already on my third bottle. Every time I want to stop, I see old photos and remember why I started. An integral part of my routine.
Natalie G.
★★★★★
No more mascara needed
My eyelashes were invisible without mascara. Now they are naturally dark, long, and visible. I've barely touched mascara for two months. What freedom!
Lily O.
★★★★★
Also with contact lenses, for sure
I wear contact lenses and was really concerned about irritation. Absolutely none. The formula is so clean and gentle. I completely trust it now and recommend it.
Sara M.