One source of antioxidants is phycocyanin from the microalga Spirulina platensis which has pharmacological activity as a natural antioxidant. This study aims to determine the antioxidant activity of phycocyanin from Spirulina platensis microalgae in vitro using the DPPH and FRAP methods. Based on the results of this study, the antioxidant activity of the positive control of vitamin C have IC50 …