But with aging comes the slow constriction(bore diameter) of the capillaries thereby reducing the ability of the cardiovascular system to deliver the necessary nutrients.
One thing that counteracts this is to dialate all your capillaries on a weekly basis. Sort of like exercising them. Large doses of niacin on an empty stomach will do this. Start with low doses and gradually increase them. You kind of have to anyway. I've been doing it for over 25 years and I need about 4 grams to equal the effect that 500 mg did in the beginning. That effect being the look of a real bad sunburn. Lasts about 4 hours.