Dietary Supplement. The Heart of Herbal Health™ CircusFlow has an impressive combination of ingredients related to a healthy heart and arteries, in the perfect balance for optimal efficacy. Helps Maintain Cardiovascular Function and a Healthy Circulatory System*. Hawthorn Berry - Supports arterial integrity, free flowing circulation, appropriate cholesterol levels and string, steady heartbeats,. Horsetail - Contains elemental silica for maintaining flexible arterial walls. Chromium - Maintains the cholesterol balance of LDL and HDL. Selenium - Linked to p.