*Disclaimer: The effects of the product may vary between individuals and could differ from those described on the website.

Lash and Brow Booster Serum 1+1 FREE

Receive a 84-day supply

A powerful booster for longer, fuller and stronger lashes and brows.

Have your lashes and brows lost their wow? This 2-in-1 eyebrow and eyelash growth serum will help you grow gorgeous lashes and fuller brows in just 4 weeks*! 

  • Triple-actionboosts lash and brow growthstrengthens and moisturises  

  • Reduces breakage and premature falling out 

  • First visible results within 21 days*! 

  • Light, non-greasy, non-sticky, fast-absorbing formula with a pleasant scent 

  • 6 natural-based active ingredients with NO parabens or hormones 

  • Dermatologically tested and made in EU 

Users were thrilled with the results90% reported getting thicker and darker lashes, while 80% noted the same for their brows! 

Contents: 1x Lash and Brow Booster Serum 1+1 FREE 2 mls/84 days

Sufficient for 84 days

-49% discount
Special price £25.99 Regular price £50.99
In stock

Effective triple-action formula that puts the wow back into your lashes and brows!

With some seriously impressive results

Turn your lashes and brows from drab to fab

Longing for those fabulous fluttery lashes? Dreaming about thicker, healthier-looking brows? UNDO Lash and Brow Booster Serum contains a mix of 6 natural-based active ingredients that will help you grow longer, thicker and fuller lashes and brows in a quick and natural way.

Its triple-action formula boosts their growth, strengthens and protects the hair within the follicle and moisturises the hair and skin, which also means your lashes and brows won't break or fall out as easily.

Get gorgeous lashes and brows in a matter of weeks – with just 2 applications a day.

First visible results within 21 days* already! 

Our in-house study has shown that after just 21 days* of using our eyebrow and eyelash growth serum:

  • 90% of users reported getting thicker and darker eyelashes

  • 80% reported getting thicker and darker eyebrows

  • 70% reported a visible increase in lash and brow density as well as in lash length

  • 80% noted a decreased lash loss

*Disclaimer: The effects of the product may vary between individuals and could differ from those described on the website.

Triple-action formula for wow-worthy results 

Your lashes and brows go through 3 phases: growth, degradation and resting. Our eyebrow and eyelash growth serum significantly prolongs the growth phase, activates the growth of new hairs, and strengthens and moisturises each individual one. And the result? Luscious lashes and brows!

Boosts natural lash and brow growth

It strengthens each individual hair right from the root and stimulates keratin production, creating a fuller appearance.

Strengthens and protects the hair

It strengthens each individual hair right from the root and stimulates keratin production, creating a fuller appearance.


This prevents brittleness and dryness and ultimately reduces breakage and premature falling out.

 How UNDO Lash and Brow Booster Serum works

The main active ingredient Biotinoyl Tripeptide-1​ helps reduce hair loss and make the eyelashes grow longer, fuller and stronger.

Biotin, also known as the beauty vitamin, stimulates keratin production, which strengthens lashes and brows and boosts their growth.

Panthenol has been shown** to protect the fibre in the hair follicle, preventing breakage. It also maintains eyelid hydration and has a soothing effect on the skin.

Arginine contributes to improving blood circulation to hair roots and stimulating hair growth.**

Hyaluronic acid helps keep the skin and hair moisturised, preventing dryness, brittleness, breakage and premature falling out.

Caffeine has been shown** to enhance hair shaft elongation, prolong hair growth and stimulate the production of keratin – a key structural component of hair.

Why eyelash growth serums are better than extensions

The truth is, we all want that amazing flutter – and we want it yesterday. Lash extensions do the job, so why even bother with a serum? Well, because faster isn’t always better:

  • lash extensions can break your natural lashes or make them fall out faster

  • they can cause irritation, allergies or even infections

  • eyelash glue often contains toxic chemicals, including formaldehyde

  • extensions only last a few weeks and removal often results in extremely sparse lashes and even “bald spots”

Get that magical flutter in a safe and natural way!

UNDO Lash and Brow Booster Serum will make your lashes thicker, longer and fuller in just 21 days*!

What makes UNDO Lash and Brow Booster Serum better than the rest?

  • Our eyebrow and eyelash growth serum is packed with key ingredients for gorgeous, fluttery lashes: peptides, biotin, panthenol, amino acids, hyaluronic acid and caffeine.

  • Unlike many other products on the market, it’s been dermatologically tested.

  • It underwent rigorous microbiological & heavy metal testing.

  • We’re completely transparent about our ingredients – you can find them with just a few clicks.

  • It’s made in the EU.

How to use

How to use

Apply 2 times per day.

1 application

2 times per day


Aqua, Glycerin, C12-15 Pareth-12, Zinc PCA, Phenoxyethanol, Panthenol, Ethylhexylglycerin, Xanthan Gum, Arginine, Caffeine, Citric Acid, Sodium Hyaluronate, Urea, Disodium Phosphate, Biotin, Biotinoyl Tripeptide-1.


Shake well before use! Apply mornings and evenings to a clean lash and brow line, one stroke along your upper and lower lash line and all over the brows. Wait until the serum dries (30-60 seconds) before applying other cosmetic products. For best results, we recommend using the product regularly (2x daily) for 4-6 consecutive weeks.


Do not use this product if you have any eye-related problems. Avoid contact with eyes. If contact occurs, rinse thoroughly with water. If irritation occurs, discontinue use.


We recommend doing a patch test before first use. Apply a small amount of the product on the clean outer corner of the right lash line. Observe for 24 hours to determine skin acclimation.

The colour, flavour and smell of the product may vary slightly from batch to batch due to natural variations in the properties of active ingredients. These variations have no impact on the overall quality and efficacy of the product.


8 ml


E. Wagner, Parfumerie und Kosmetik, 1994, 75 (260-267)

Wu, G.A.B., Meininger, C.J., Knabe, D.A., Baze, F.W.A. & Rhoads, J.M. (2000) Arginine nutrition in development, health and disease, Current Opinion in Clinical Nutrition & Metabolic Care, Volume 3, issue 1, (pp. 59-66) https://pubmed.ncbi.nlm.nih.gov/10642085/

Fischer TW, Herczeg-Lisztes E, Funk W, Zillikens D, Bíró T, Paus R. Differential effects of caffeine on hair shaft elongation, matrix and outer root sheath keratinocyte proliferation, and transforming growth factor-β2/insulin-like growth factor-1-mediated regulation of the hair cycle in male and female human hair follicles in vitro. Br J Dermatol. 2014 Nov;171(5):1031-43. doi: 10.1111/bjd.13114. https://pubmed.ncbi.nlm.nih.gov/24836650/