Hergen S1 Shampoo is formulated for scalps affected by severe dandruff conditions. Its professional formula helps purify the scalp, reduce the appearance of visible flakes and promote a long-lasting feeling of freshness and comfort. Helps reduce the appearance of severe dandruff Deeply purifies the scalp Helps soothe scalp discomfort Limits visible flake buildup Leaves hair feeling clean and lightweight HOW TO USE Apply to wet hair and gently massage into the scalp. Leave on for a few minutes, then rinse thoroughly. Repeat if necessary and follow with the appropriate treatment.