Doctors Formulas Vitamin C Formula Fast Action contains the best and most absorbable forms of vitamin C from camu camu and acerola, as well as piperine, which accelerates the absorption of vitamin C, resulting in high concentrations of vitamin C in the blood in just 30 minutes. Thus, the body immediately acquires one of the most important vitamins for its function and health, since it has antioxidant activity and contributes to maintaining good immune and cardiovascular health in many ways.