Cinchona is a tree originally from South America. Its bark extract contains Quinine, well-known for its fortifying properties. Researchers at KLORANE Laboratories have selected an extract of red cinchona due to its particularly high content of Quinine, which has a stimulating action on the hair bulb & in turn strengthens the hair. Klorane cinchona extract is combined with a vitamin B complex (B5-B6-B8) known for its capacity to reinforce hair structure & stimulate growth. KLORANE Strengthening Conditioner with Quinine & B Vitamins will reinforce & prolong the effect of Klorane shampoo with Quinine. Hypoallergenic. Paraben free.