Kerastase Symbiose Anti-Dandruff Night Serum is a leave-in scalp serum that works through the night to reduce visible dandruff and calm irritation on sensitive, flake-prone scalps. Its concentrated formula pairs salicylic acid and piroctone olamine with bifidus, acting continuously for 8 hours while the scalp is in its natural regeneration phase. The lightweight gel texture is sulfate-free, silicone-free and leaves no greasy residue on hair or pillow.

Why This Night Serum Works

Dandruff forms when the scalp's cell renewal accelerates and dead cells accumulate faster than they shed. This serum targets that cycle overnight, when the scalp regenerates most. Kerastase reports up to 7 weeks of anti-dandruff efficacy in a clinical study of 37 people after 4 weeks of use, with 94% of consumers reporting a healthier, stronger-feeling scalp. The formula is designed to preserve the scalp barrier rather than strip it.

Ideal For

This serum is built for sensitive scalps prone to dandruff, whether the flaking is dry or oily. It suits anyone who wants to treat the scalp without adding a wash-day step, since it works while you sleep and requires no rinsing. It is a strong option for colour-treated hair, as the formula contains no sulfates or silicones.

Safety Information

Apply to the scalp only. Avoid contact with the eyes; if the serum does get in your eyes, rinse immediately and thoroughly with water. Do not apply to a scalp that is broken, irritated or has open lesions. Keep out of reach of children. If scalp irritation or flaking persists or worsens, stop using the product and consult a pharmacist or healthcare provider.

• Salicylic Acid: exfoliates the scalp surface and loosens the adhesion of existing flakes so they lift away more easily

• Piroctone Olamine: acts on the micro-organisms associated with dandruff formation, addressing the cause rather than the symptom

• Bifidus (Bifida Ferment Lysate): helps rebalance the scalp microbiome and supports its natural hydration

• Squalane and Glycerin: soften and hydrate the scalp so the active exfoliants do not leave it feeling tight

Free from sulfates and silicones. Suitable for all hair types, including colour-treated hair. The signature Symbiose fragrance carries notes of mandarin, blood orange and jasmine.

1. Start with a dry or towel-dried scalp. There is no need to wash your hair first.

2. Draw 3 to 4 doses using the pipette. One dose equals one pipette filled to the marked line.

3. Apply directly to the scalp, working section by section. Apply to the scalp only, not the lengths.

4. Massage in gently with your fingertips. Do not rinse.

5. Leave on overnight, for roughly 8 hours. No need to wash it out in the morning.

Use at least 3 times a week before bed, over a 4-week period. Kerastase recommends pairing it with the Symbiose shampoo range for best results.