The Nutrition Committee of the American Heart Association has examined decades' worth of studies on the health benefits of soy, and has found little evidence that soy-based foods and supplements significantly lower cholesterol, as has sometimes been claimed.
Potential Labeling Change
These findings could result in the FDA changing rules which currently allow companies which produce soy-based foods to advertise a cholesterol-lowering benefit on the label.
No Benefits
While a very large amount of soy protein might lower LDL ("bad") cholesterol by a few percentage points, there were no observed benefits with regard to HDL ("good") cholesterol, triglycerides, lipoprotein, or blood pressure. The benefits of soy supplements to cardiovascular health are therefore likely "minimal at best".