Some people report digestive problems with taking a lot of supplements that contain it. But it might just be the part that's the capsule in those.
Is this (http://www.integrativeinc.com/Products/Products-by-Health-Concern/Cardiovascular-and-Circulatory/Leg-Circulation-and-Veins/78849-Varicosin.aspx) the one you take, or another company? I've now found a few different ones. Jeez.