Don't read too much into that. Without the niacin, there would be no improvements.
It is the niacin that does the cardiovascular repairs, not iodine:
Niacin Lowers Cholesterol & Triglyceride Levels; Treats Niacin Deficiency;
Reduces Heart Attack Risk & Narrowing of the Arteries in Heart Disease
Niacin is used to help lower high cholesterol and fat levels in the blood. This may help prevent medical problems caused by cholesterol and fat clogging the blood vessels. your doctor will probably try to control your condition by prescribing a personal diet for you. Such a diet may be low in fats, sugars, and/or cholesterol.
Many people are able to control their condition by carefully following their doctor's orders for proper diet and exercise. Also, this medicine is less effective if you are greatly overweight. It may be very important for you to go on a reducing diet.
This book is available at Amazon LINK
There is hope for calcified arteries ( atherosclerosis ) without drugs & surgery. Prevent strokes, heart attacks & Aneurysm. Calcified arteries are subject to Aneurysm, Ballooning & Rupture.
An aneurism is when a blood vessel balloons out and bursts. Poor nutrition results in weak blood vessel walls. Calcified arteries can result in weak spots that can burst. High blood pressure also contributes to aneurysms. More on Aneurysm.
Vitamin B3 (Niacin)
Take B3 with meals to help avoid the flush response ⇐ IMPORTANT
pain, 1,000 to 3,000mg daily
Best to lower cholesterol, 1,000 to 3,000mg daily FAR better than Statin drugs
Opens blood vessels to help flush toxins
Reduce Blood Pressure
Improves blood flow to the legs & feet
Reverses Heart Disease
Stops Migraine Headaches
Improved memory & reverse senility problems
Vivid dreams while sleeping
Helps prevent Insomnia, 1,000mg before bed
Much more: http://www.drdavidwilliams.com/niacin-benefits/
This is why Dr. Brownstein specifies B3 with his Iodine