Specifications
| SKU | ISG000002 |
| Brand | Kerastase |
| Categories | Hair Care |
| Color | black |
| Shop by Concerns | Hair Damage |
| Gender | Unisex |
| Shop By Goals | Anti-Nausea |
| Ingredient | Ceramide Creatine Taurine |
| UPC | 3474636636341 |
| Size | 50 Ml |
| Specialty | Professional Salon Care Strengthening Suitable for Color-Treated Hair |
| Sub Categories | Hair Oils & Serums |
| Warning | Avoid inhalation For external use only Keep Out of Reach of Children Discontinue use if irritation occurs |
About the product›
Kerastase Resistance Serum Extentioniste 50 ml
Description:
- Kerastase Resistance Serum Extentioniste 50 ml is an intensive leave-in scalp and hair serum designed to support longer, stronger, and healthier-looking hair from root to tip. This lightweight, non-greasy formula is part of the Resistance Extentioniste range, targeting weakened, slow-growing, and breakage-prone hair. With a fresh, salon-like fragrance and fluid texture, it absorbs quickly into the scalp and hair fiber, helping to reinforce the hair structure, reduce breakage, and promote the appearance of longer lengths with a smooth, glossy finish.
Indications:
- Ideal for weakened, damaged hair that breaks easily and struggles to grow past a certain length
- Recommended for hair exposed to frequent heat styling, chemical treatments, or mechanical damage (brushing, tight hairstyles)
- Suitable for slow-growing hair that appears thin, fragile, or lacks resilience from root to tip
- Beneficial for those seeking a complete length-strengthening routine to support longer, stronger, and more resistant hair
Key Benefits:
- Strengthens hair fibers from root to tip to help reduce breakage and split ends
- Supports healthier-looking scalp conditions for optimal hair growth environment
- Improves hair resistance to daily aggressions, heat styling, and mechanical stress
- Leaves hair feeling smoother, softer, and more manageable with enhanced shine
- Helps optimize hair length potential so hair can grow longer while maintaining strength and vitality
Goals:
- Promote the appearance of longer, stronger hair with fewer breakage-related setbacks
- Reinforce and fortify weakened hair fibers for improved resilience and elasticity
- Maintain a healthy-looking scalp to support optimal hair growth conditions
- Achieve smoother, shinier, and more manageable hair that looks and feels revitalized
Specialty:
- Professional salon-grade haircare formula from the Kerastase Resistance Extentioniste range
- Targeted length-strengthening technology designed specifically for damaged, breakage-prone hair
- Lightweight leave-in serum suitable for frequent use without weighing hair down
- Formulated to complement Bain Extentioniste shampoo and Extentioniste conditioner for a complete strengthening routine
- Focuses on reinforcing the internal structure of the hair fiber to improve resistance over time
- Can be used on all hair types, including color-treated and chemically processed hair
Key Ingredients:
- Creatine R – A strengthening complex known to help reinforce the internal structure of the hair fiber, improving resistance to breakage and external stress.
- Ceramides – Lipid-like molecules that help support the hair’s protective barrier, enhance moisture retention, and improve smoothness and shine.
- Taurine – An amino acid derivative that helps protect the scalp and hair environment, supporting stronger, healthier-looking lengths.
Note: Exact concentrations of active ingredients in Kerastase Resistance Serum Extentioniste 50 ml are not publicly disclosed by the manufacturer.
Texture & Finish:
- Lightweight, fluid serum texture that spreads easily on the scalp and hair without leaving a greasy or sticky residue
- Absorbs quickly, allowing comfortable leave-in use without weighing hair down or affecting styling
- Leaves hair with a smooth, soft touch and a healthy-looking, natural shine
How to Use:
- Start with clean, towel-dried hair. For best results, wash with Kerastase Bain Extentioniste shampoo and follow with Extentioniste conditioner or mask.
- Section the hair and apply the serum directly to the scalp, focusing on the roots and areas where hair feels weakest or most fragile.
- Gently massage the serum into the scalp using fingertips in circular motions to encourage absorption and stimulate the scalp.
- Distribute any remaining product through the lengths and ends if desired. Do not rinse. Use 2–3 times per week or as recommended by your hair professional, preferably on damp hair. Can also be used on dry hair if needed.
- Style as usual. For a complete length-strengthening routine, combine with other Kerastase Resistance Extentioniste products and minimize excessive heat and mechanical stress.
Suitable For:
- Skin Types: Not applicable (scalp and hair serum).
- Hair Types: All hair types including fine, normal, thick, straight, wavy, curly, and coily hair; suitable for color-treated, chemically processed, and heat-styled hair.
- Concerns: Hair breakage, split ends, slow-growing lengths, weakened and fragile hair, lack of strength and resilience, dull and tired-looking hair.
Results:
- With regular use, hair feels stronger and more resistant to breakage, helping to preserve length.
- Hair appears smoother, shinier, and healthier-looking over time, with improved manageability and reduced signs of damage. Visible improvements in strength and length retention are typically noticed over several weeks of consistent use as part of a complete haircare routine.
Side Effects:
- May cause mild scalp sensitivity or tingling in some individuals, especially during the first uses.
- Slight redness or irritation may occur on very sensitive scalps.
- Rare allergic reactions may occur in individuals sensitive to specific ingredients such as fragrance or certain conditioning agents.
- Note: If severe irritation, rash, itching, or discomfort occurs, discontinue use immediately and consult a dermatologist or healthcare professional.
Precautions:
- Patch test recommended before first use on a small area of the scalp.
- Avoid direct contact with eyes; if contact occurs, rinse thoroughly with water.
- For external use only on scalp and hair.
- Discontinue use if irritation or adverse reactions occur.
- Do not apply on broken or severely irritated scalp.
- Keep out of reach of children.
- Store in a cool, dry place away from direct sunlight and excessive heat. Keep bottle tightly closed when not in use.
Disclaimer:
All pharmacy products are intended for general use only and do not replace professional medical advice, diagnosis, or treatment. Always consult a healthcare provider before use. Results may vary, and no specific outcomes are guaranteed. Products are not intended to diagnose, treat, cure, or prevent any disease unless stated. Follow label instructions carefully, as misuse may cause adverse effects. Compliance with local laws is the customer’s responsibility.







