Lancôme Cils Booster XL Lash Primer, 5.5ml

Lancôme Cils Booster XL is a white, fibre-enriched lash primer intended for use under mascara. The listing claims it can help lashes look longer, curlier and thicker while conditioning them and making mascara application smoother. It is a primer rather than a standalone mascara or a lash-growth serum.

At a glance

White primer formula enriched with fibres, according to the listing.
Designed to be applied beneath your usual mascara.
The listing claims conditioning and a smoother mascara application.

Price

£20.36Save 15%

Reference price: ~~£23.95~~

Price checked: 14 Nov 2026

View offer

Often bought together

Lancôme, Cils Booster XL Lash Primer, Volumising & Thickening Base, 5.5ml | Fibre-Enriched, Lengthening Base, Protects Lashes

Pros and cons

Pros

Its under-mascara role makes it a targeted option for layering with a mascara you already use.
Customer feedback reports smooth application and buildable coverage without clumping.

Technical specifications

3 specifications

Identity
Brand	Lancôme
Product type	Mascara primer

Dimensions and installation
Dimensions listed	10 x 10 x 5 cm; 0.5 g

What to know before buying

Listing details to confirm

The listing gives the product size as 5.5ml, while its dimensions entry also lists a weight of 0.5 g. Customer feedback also describes the size as not the usual size and some say it lasts only 2–3 weeks. These details do not establish a confirmed package-size discrepancy or typical lifespan, so check the selected listing if either matters.

Who is it for?

A good fit for

Mascara users looking to add a primer layer before their usual mascara.
Buyers interested in a fibre-enriched base and the claimed conditioning effect.

Less suited to

Anyone seeking a standalone mascara rather than a base to wear under mascara.
Buyers looking specifically for a lash-growth serum. The supplied listing describes a makeup primer.

Lancôme Cils Booster XL Lash Primer, 5.5ml · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 4,637 ratings

5 stars77%77%
4 stars10%10%
3 stars7%7%
2 stars4%4%
1 star2%2%

Customer feedback highlights perceived effectiveness, added lash volume and coverage, with reports of smooth application and buildable layers without clumping. Some customers question value and longevity, with reports that it may last only 2–3 weeks, and size also draws criticism. These experiences matter if you are weighing repeat-purchase cost or expecting a particular amount of product. Aggregate ratings are mostly five-star, but ratings alone do not explain individual experiences.

Positive themes

Customers report effectiveness, enhanced lash volume and coverage.
Feedback mentions smooth application and buildable layers without clumping.

Negative themes

Some customers criticise the size as not the usual size.

Mixed feedback

Opinions differ on value for money and how long the product lasts. Some say it lasts only 2–3 weeks.

Frequently asked questions

How is Cils Booster XL used?

Apply it beneath your usual mascara. The listing describes it as a base rather than a standalone mascara.

What does the listing claim it does?

It claims to help lashes look longer, curlier and thicker, condition them and make mascara application smoother. These are listing claims, not independently verified results.

Is this a lash-growth serum?

The product title and main feature text describe a mascara primer. Other listing content refers to a revitalising serum, so the product description is inconsistent. Confirm the selected item details if you are seeking a serum.