Are there any herbal supplements that can be ingested to prevent coronary artery disease?

Yes: Coronary artery disease is caused by a build up of cholesterol on the walls of coronary arteries. Decreasing cholesterol may help. There has been a lot of research done to see what supplements may be helpful, but i can tell you that their effect is modest if that. Garlic is one, flexseed, fiber supplements (benefiber) are some examples. Red rice yeast, although, popular may cause other problems.

Fish oil: Not herb! still a supplement. Fish oil 1-2 grams per day prevents death from heart attacks and bad heart rhythms. Don't forget the big 3: eat right. Get moving 30-60 minutes every day. Don't smoke.

Consider: Consider adding niacin, fish oil and/or red yeast rice. I recommend checking with your physician prior to starting these as they may not be right for you given existing conditions or medicines. Consider use of new lipid profiling such as NMR testing to determine your cardiovascular risk.

Cardiocidin-ND: Cardiocidin has clove oil - antiinflammatory and prevents atherosclerosis, the other formula called circuzyme has hisperidine, diosmin from grape seeds and delta tocopherols which helps with both artery and venous blood flow.