Noahs volumizing shampoo is a perfect choice for those who want to add volume and vitality to their hair. Its formula includes citrus extracts for fresh, full-bodied hair. Instructions for use The minimum usage instructions for Noah Citrus Volumizing Shampoo 250ml are as follows: Apply a small amount of shampoo to wet hair and gently massage into the scalp. Then rinse thoroughly with water. Regular use of this shampoo is recommended for best results in hair volume and appearance.