Biolage Scalp Sync Purifying Scalp Concentrate. This gentle pre-shampoo prepares the scalp by removing impurities, buildup, excess oil, and dead skin cells. What benefits does the pre-shampoo offer? It cleanses and exfoliates the scalp, refreshes, hydrates, and strengthens the hair. It is suitable for all hair and skin types, free from sulfates, parabens, silicones, and mineral oils, vegan, and not tested on animals.