Kerastase Bain Bio-Recharge Dry Hair the first purifying shampoo that reactivates the scalp's natural defences for long-lasting healthy hair. Benefits: Rebalances and reactivates the scalp's natural defences. The scalp is left fresh and your hair is left wonderfully soft and healthy looking. Application: Wet hair thoroughly. Apply Bain Bio-Recharge-combination. Massage through the scalp and hair using the flats of the hands and complete the gentle massage technique, emulsify and rinse thoroughly. Blot dry. Re-apply using the gentle massage technique and leave for a few minutes. Lather by adding a little warm water and gently emulsify before rinsing thoroughly.