In the current study, platelet aggregation was measured following activation with three physiological agonists of platelet activation, specifically AA, ADP, and collagen. AA causes aggregation of platelets through a cyclooxygenase-1 (COX-1)-dependent pathway.25 Aspirin strongly inhibits AA-induced platelet aggregation.25 Platelets are known to contain high concentrations of ATP, which breaks down during aggregation.14 Hellem and Odegaard reported highly specific induction of platelet aggregation by ADP, which is the first breakdown product of ATP.24 Collagen is one of the most thrombogenic components of the subendothelium.26 Following vascular damage, circulating platelets are exposed to collagen which acts both as a substrate for the adhesion of platelets and as an agonist to platelet activation.26 Strong inhibition of collagen-induced platelet aggregation by oral supplementation of CAPROS is a novel finding of this study. Plant extracts rich in polyphenols and tannins have been shown to potently inhibit platelet aggregation.27 It is plausible that the inhibition noted in platelet aggregation is because of high polyphenol content of this extract. This finding warrants further investigation into the mechanism of action of CAPROS on ADP- and collagen-induced inhibition of platelet aggregation.