Product Details

Kérastase Serum Filler Fondamental is a lightweight, leave-in serum designed to repair and protect all types of damaged hair, particularly those affected by over-processing or lightening. Hard water’s calcium can penetrate porous hair up to three times more than untreated hair, causing stiffness and dullness. This serum’s dual-action formula, enriched with repairing agents like Hydrolyzed Vegetable Protein and Glycine, seals cuticles to shield the hair surface and reinforces inner strength, restoring 99% of hair’s original strength. It protects against calcium damage, humidity, and heat up to 230°C, while providing 72-hour frizz control. Hair is left 49% softer, 3x smoother, and glossy, with enhanced manageability and a supple, healthy appearance.

Key Benefits

• Repairs damage, restoring 99% of hair’s strength
• Seals cuticles for 3x smoother, 49% softer hair
• Controls frizz for up to 72 hours
• Protects from heat up to 230°C and calcium damage
• Enhances gloss and manageability without greasiness
• Vegan and cruelty-free for sustainable care

Suitable For

• All damaged, over-processed, or lightened hair types
• Hair exposed to hard water and calcium buildup
• Those seeking anti-frizz, repairing, and heat-protective care

Directions For Use

1. Wash hair with a gentle Kérastase shampoo and towel-dry.

2. Dispense 1-2 pipettes of Kérastase Serum Filler Fondamental into your palm.

3. Apply evenly to damp or dry hair, focusing on mid-lengths to ends.

4. Leave in and blow-dry or heat style as desired for a smooth, glossy finish.

Pro Tips

• Use sparingly on fine hair; 1 pipette is often sufficient to avoid overloading.
• Pair with Kérastase Première Bain Decalcifiant Reparateur for enhanced decalcifying and repair.
• Apply to damp hair before heat styling to maximize frizz control and shine.

Ingredients

AQUA / WATER / EAU • ISOPROPYL MYRISTATE • DIMETHICONE • TRIETHANOLAMINE • AMODIMETHICONE • PARFUM / FRAGRANCE • PHENOXYETHANOL • CARBOMER • POLYQUATERNIUM-4 • POTATO STARCH MODIFIED • LIMONENE • HYDROXYPROPYL GUAR • BEHENTRIMONIUM CHLORIDE • HYDROLYZED VEGETABLE PROTEIN PG-PROPYL SILANETRIOL • GLYCINE • TRIDECETH-6 • ISOPROPYL ALCOHOL • LINALOOL • CETRIMONIUM CHLORIDE • CITRAL • COUMARIN • BENZYL SALICYLATE • SODIUM BENZOATE • BENZYL ALCOHOL • CITRONELLOL • ALPHA-ISOMETHYL IONONE • POTASSIUM SORBATE • GERANIOL •

*We make every effort to keep our ingredient lists accurate and up to date. However, formulations may be improved or adjusted over time, and slight variations can occur between regions due to local regulations. For the most accurate information, always refer to the ingredient list printed on your product packaging.

Frequently Asked Questions

Q. Does Kérastase Serum Filler Fondamental make hair greasy?

A. No, its lightweight formula absorbs quickly, leaving hair soft and glossy without residue.

Q. Is Kérastase Serum Filler Fondamental suitable for all hair types?

A. Yes, it repairs and protects all damaged, over-processed, or lightened hair types.

Q. Can Kérastase Serum Filler Fondamental be used with other Kérastase products?

A. Absolutely, it pairs well with Kérastase Première Bain and Fondant for enhanced repair and decalcifying.

Q. Does Kérastase Serum Filler Fondamental protect against heat damage?

A. Yes, it protects hair from heat up to 230°C, ideal for blow-drying and styling.

Q. How often can I use Kérastase Serum Filler Fondamental?

A. It’s suitable for daily use on damp or dry hair to control frizz and repair damage.

Q. Does Kérastase Serum Filler Fondamental reduce frizz?

A. Yes, it provides 72-hour frizz control, leaving hair smooth and manageable.

Q. Is Kérastase Serum Filler Fondamental safe for color-treated hair?

A. Yes, its vegan formula repairs without fading color, preserving vibrancy.