Biolage Essentials ScalpSync anti-hair loss tonic 10 x 6 mlPrevent excessive hair loss. Biolage Essentials ScalpSync anti hair loss tonic prevents the accumulation of collagen at the hair roots, which prevents the hair fiber from receiving nutrients, causing the hair to weaken and subsequently fall out. If you dream of thick thick hair, with this tonic your dream will be within reach. Properties: prevents the accumulation of collagen at the hair roots, and their subsequent "suffocation" strengthens and