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Kérastase

Première – Sérum Filler Fondamental Hair Serum – 90ml

Leave-In Serum for Weak, Over-Processed Hair

(1 customer review)

$89.00

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If your hair still feels brittle after conditioning, it’s likely missing the final layer of protection. The Kérastase Première Sérum Filler Réparateur is the essential last step in your damaged hair routine. This lightweight leave-in serum locks in repair, smooths the cuticle, and protects against heat and environmental stress.

This powerful serum not only helps to seal in the results of the Première routine, but also actively strengthens the outer layer of the hair fibre. Hair becomes softer, shinier, and noticeably more resilient, especially when facing frequent heat styling or harsh water.

Key Ingredients

  • Glycine
    After calcium is cleared, glycine steps in to help rebuild the inner structure of the hair. It works deep within the fibre to support long-term strength and resilience.
  • Peptides
    These short chains of amino acids help refill and smooth the hair’s surface, making it look and feel healthier, shinier, and more polished.

Why You’ll Love It:

  • Helps reinforce damaged hair and seal in internal repair
  • Reduces breakage and frizz by smoothing the cuticle
  • Lightweight formula doesn’t weigh hair down
  • Provides up to 450°F (230°C) of heat protection
  • Great for colour-treated, bleached, or chemically processed hair
  • Enhances shine and softness without residue

Pomme Pro-Tip

This is Nicole’s must-have for finishing the Première routine. If your hair is prone to dullness, colour fading, or dryness after styling, the Sérum Filler Réparateur acts like a seal, helping lock in moisture and shine while extending the results of your in-salon colour services.

Need help layering the products in your routine? Nicole breaks it all down in this blog: How to Use the Kérastase Première Line for Damaged Hair →

Product Highlights

  • Damaged Hair
  • Frizz Control
  • All Hair Types
  • Best Sellers
  • Kérastase Full-Size
  • Nicole's Favs!
  • Sulphate-free formulas
    • Step 1: For medium-length hair, use 2–3 pumps; for long hair, use 3-5 pumps on towel-dried hair, focusing on lengths and ends
    • Step 2: Do not rinse
    • Step 3: Style as usual — this product also acts as a heat protectant up to 450°F (230°C)
    • Step 4: Can be used daily for added strength and shine
  • 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 

    1.  What does the Sérum Filler actually do?
      This serum is the final step in the Première routine. It helps seal in internal repair, smooths the outer layer of the hair, and protects against heat damage, all while leaving your hair soft, shiny, and resilient.
    2.  Is this only for damaged hair?
      While it’s designed for damaged or chemically treated hair, anyone who uses heat tools, colours their hair, or lives in a hard water area can benefit from the strengthening and protective properties.
    3. Can I use this every day?
      Yes! It’s lightweight enough for daily use. Apply it to damp or dry hair before styling to boost softness, shine, and protection.
    4.  Will it make my hair greasy or heavy?
      No! This formula is designed to be weightless and fast-absorbing. Depending on your hair length, 2-5 pumps are plenty, even for finer hair types.
    5. Do I still need a heat protectant with this?
      Nope, the Sérum Filler offers built-in heat protection up to 230°C (450°F), making it perfect before blow-drying, flat ironing, or curling.

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