Instantly hydrate and soothe sensitive and allergy-prone skin with La Roche-Posay Toleriane Ultra Dermallergo Serum, a restorative daily serum to help to protect the skin's natural barrier and reduce signs of sensitivity.. La Roche-Posay's first neurosensine concentrated serum effectively locks in the skin's natural moisture to immediately soothe dry, tight and itchy skin. Enriched with 0.1% neurosensine - a naturally-occurring protein - the serum is clinically proven to calm the sensitised complexions.. The combination of osmolyte and anti-irritation thermal spring water allows this delicate yet effective serum to hydrate the skin for up to 48 hours. The formula also restores the skin's barrier to minimise future reactions, so sensitive skin is protected over time.. Held in a vibrant, bright blue bottle, the hypoallergenic, fragrance-free liquid serum immediately soothes irritated skin so your complexion looks and feels revitalised.. Why We Love It. This innovative formula is approved by Allergy UK and has undergone intense dermatological testing to ensure that it's suitable for sensitive skin, so you can receive that much-needed boost of hydration without irritation.. Top tip: to really feel the effects of this light, refreshing and soothing serum, store the bottle in a cool place for 30 minutes before application.. How To Use It. Use the pipette to apply a few drops of this serum in the morning and evening onto the face and neck area.. Works Well With. Follow this serum with any one of La Roche-Posay's nourishing facial moisturisers for sensitive skin, so your complexion will look and feel its best.. Values. Hypoallergenic.. Fragrance-free, alcohol-free.