Lancôme Cils Booster XL mascara primer Full Size — fiber-infused lash primer with Vitamins B5 & E

This primer from Lancôme is designed to be the first step in your lash routine: a white, fiber-infused formula that separates and conditions each lash to amplify the effects of your mascara. Formulated with micro-fibers plus Vitamin B5 and Vitamin E, it smooths on evenly and builds a clump-free foundation that enhances length, volume, and curl. Use it before mascara for immediate cosmetic lift or as an overnight treatment to nourish lashes while you sleep.

How does Cils Booster XL improve the look of my lashes before mascara?

The primer applies as a lightweight, white layer that increases lash thickness and helps mascara adhere more evenly. The micro-fibers create a subtle extension effect while the formula separates lashes so pigment deposits cleanly, reducing clumps for a false-lash appearance without added falsies.

• Even white base increases mascara pigment payoff.
• Micro-fibers add visible length and density.
• Brush design coats from root to tip for uniform coverage.
• Prevents clumping and improves mascara glide.

Can I use this product as a lash treatment overnight?

Yes — the Cils Booster XL doubles as a nourishing overnight mask. Applied to clean, bare lashes before bed, its vitamin-enriched formulation conditions while you sleep, leaving lashes softer and visibly improved with regular use.

• Apply to dry, clean lashes before bedtime.
• Vitamins B5 and E support lash softness and resilience.
• Non-stiff finish avoids crunchy residue.
• Visible improvement with continued nightly use.

What is the best way to layer this primer with my mascara?

For optimal results, brush one to two coats of the primer onto both upper and lower lashes, working from the base outward. Do not wait for the primer to dry fully before applying mascara; layer your chosen mascara directly on top to fuse pigments and fibers for enhanced length and volume.

• Apply 1–2 coats on top and bottom lashes.
• Do not let it dry completely before mascara application.
• Use a sweeping motion to avoid clumping at the base.
• Works with any mascara formulation for amplified results.

What performance can I expect from clinical testing?

Consumer testing showed the majority of users noticed enhanced lash traits after a single application and ongoing benefits with continued use. While individual results vary, the formula is designed to both cosmetically boost lashes immediately and support visible improvement over time.

• High percentage of users reported increased length and volume.
• Also shown to improve visible curl for many participants.
• Delivers a soft, conditioned feel rather than stiffness.
• Dual-purpose as primer and overnight mask for daily and nightly routines.

Who is this for? Lancôme Cils Booster XL suits anyone who wants fuller-looking, longer lashes without using falsies — ideal for those seeking a conditioning base to improve mascara performance as well as users who prefer a dual-function product for daytime makeup and nighttime lash care. It benefits users with sparse, short, or straight lashes who want a clump-free, natural lifted finish and those who appreciate a vitamin-enriched formula to help maintain lash softness and resilience.

Ingredients

POLYBUTENE • PENTAERYTHRITYL TETRAISOSTEARATE • C18-36 ACID TRIGLYCERIDE • TRIDECYL TRIMELLITATE • BIS-DIGLYCERYL POLYACYLADIPATE-2 • SILICA DIMETHYL SILYLATE [NANO] / SILICA DIMETHYL SILYLATE • CALCIUM SODIUM BOROSILICATE • PENTYLENE GLYCOL • CAPRYLYL GLYCOL • MICA • PENTAERYTHRITYL TETRA-DI-T-BUTYL HYDROXYHYDROCINNAMATE • CI 77891 / TITANIUM DIOXIDE • CI 77491 / IRON OXIDES • BENZYL BENZOATE • BENZYL ALCOHOL • TIN OXIDE • CI 45380 / RED 22 LAKE • ALUMINA • CI 15985 / YELLOW 6 LAKE • GERANIOL • LIMONENE • PARFUM / FRAGRANCE (F.I.L. B253649/1).