We all know those clients who just love to go darker than dark, Black Magics DHA booster drops are here to make that job a little easier. Boost their colour with just a few drops.Concentrated Boost Drops for that serious tanner who wants to go Darker30ml Bottles 35% DHABy adding 11 drops of DHA Booster drops into 100mls of solution you will increase the level of DHA by 1%.*1% will increase the darkness considerably.