XL 6 ML EYELASH SERUM - FOR THE PRICE OF 3 ML | PROSTAGLANDIN ANALOGUES-FREE | FREE DELIVERY OVER £25 |
TSU:SEI Natural Lashes is a clean, prostaglandin-free,
premium lash serum with an XL 6 ml pack - twice the typical 3ml category size.
Powered by four ingredient groups - Biotin Boost Complex, Active Hydration, Botanical Nutrition, and Conditioning Actives - it delivers longer, stronger, healthier lashes.
No prostaglandin analogues.
No chemicals.
Just clean, plant-powered results you can trust.
BEFORE & AFTER
CLINICALLY TESTED AND SAFE FOR CONTACT LENS WEARERS | 100% VEGAN & CRUELTY FREE | MONEY BACK GUARANTEE | 6 MONTHS SUPPLY | BLACK FRIDAY WEEK 50% OFF |
What’s the Secret to Our Results?
No Secrets at All.
TSU:SEI Natural Lashes Serum isn’t just another lash product - it’s a smarter choice.
Firstly, we give you 6 ml for £29.99, while top competitors only offer 3 ml at the same price. That means double the value and a serum that lasts up to 6 months.
Secondly, our formula is powered by four clean ingredient groups, led by the Biotin Boost Complex, delivering longer, stronger, healthier lashes - naturally.
Double the serum, double the results
 Customer holding TSU:SEI Eyelash Serum Bottle – Best Lash Serum for Longer, Fuller Lashes |  Real user showing TSU:SEI Lash Serum for Natural Eyelash Growth Results |  Before and After Eyelash Serum Transformation – Customer with TSU:SEI Bottle |  Happy customer review photo with TSU:SEI Lash Growth Serum |  Woman holding eyelash serum – TSU:SEI Lash Serum for Eyelash and Brow Growth |  Customer testimonial – Thicker Lashes with TSU:SEI Eyelash Growth Serum |
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 Smiling customer holding TSU:SEI Lash Serum – Best Eyelash Serum UK |  Customer showing TSU:SEI Natural Eyelash Serum – Fuller, Longer Lashes Review Photo |  Customer showing eyelash serum product – Trusted Lash Serum for Longer Lashes |  Real customer holding TSU:SEI Lash Serum – Eyelash Serum Results After 8 Weeks |  Authentic lash serum results – real user with TSU:SEI Eyelash Serum Bottle |
EVERY INGREDIENT HAS A PURPOSE.
100% active. 0% filler.
Our eyelash serum is formulated with transparency.
We break it down into four purposeful groups so you understand exactly what you’re putting on your lashes.
Each group plays a vital role in delivering real, visible results.
Active Hydration System
Provides lightweight hydration, delivers actives into follicles, and maintains lash moisture balance.
BiotinBoost Complex
Biotin + peptides fuel keratin, anchor lashes, and support real growth.
Botanical Nutrition
Stimulates circulation, boosts oxygen and nutrients to follicles, and supports lash vitality.
Conditioning Actives
Strengthens lash fibres, conditions against breakage, and protects from environmental stress.
Aqua (Water) | Hyaluronate | Pentylene Glycol
Panax Ginseng Extract | Swertia Japonica Extract | Pumpkin Seed Extract | Acorus Calamus Root Extract
Biotin | Biotinoyl Tripeptide-1 | Myristoyl Pentapeptide-17
Panthenol (Pro-Vitamin B5) | Serenoa | Serrulata Fruit Extract | Tocopherol (Vitamin E) | Oligopeptide-10
TSU:SEI Biotin Boost Complex
Unites biotin with clinically studied peptides to fuel lash growth at the root. Supported by nutrient-rich botanicals, a blend of conditioning and protective actives, and an active hydration system, every drop of our serum is optimised to deliver
longer, stronger, healthier-looking lashes.
Get more. Spend less. Clean beauty without compromise.
What Our Customers Are Saying
Longer Lashes, Real Stories
TSU:SEI Natural Lashes
Our Philosophy
Beauty Without Compromise
We believe beauty should never come at the cost of your health or the planet. That’s why we use nature’s finest ingredients - no harsh chemicals,
no unnecessary additives.
From skin to lashes, every formula is thoughtfully crafted to be safe, effective, and gentle, even for the most sensitive skin and eyes.
