You"ll love our best value Duo Packs! Buy the Shampoo; receive the Pre-Shampoo Propolis jelly at Half Price. While the Propolis shampoo cleanses, purifies, soothes and heals oily scalps with or without dandruff and regulates seborrhea, the Propolis jelly pre-shampoo cleanses, purifies, soothes and heals oily scalps with or without dandruff and regulates seborrhea.