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3. Men and Arterial Stiffness. As the arteries build up arterial plaque, they become more "stiff" and thus less able to dilate. One study found that even healthy men can experience improvement in arterial stiffness through Vitamin C supplementation.  A study eight years later found both blood flow and arterial stiffness improved in men with hypertension. 
4. Men Eating High Fat. One of the rules on The Peak Testosterone Forum is no pushing of high fat diets. My reasons for this are many, but the primary ones are that high fat meals induce insulin resistance and endothelial dysfunction, the polar opposite of what men need who are coming to my site. One example of this is a study where researchers gave men a high fat meal (50 grams of fat) and then 2 grams of Vitamin C to try to compensate for the artery-numbing effects of all the blubber then men has just eaten. Amazingly enough, it worked!  Am I suggesting that you megadose Vitamin C in order to handle eating a bunch of fat? Of course not as the obvious solution is simply to not consume all that fat in the first place.
Many other conditions from Metabolic Syndrome to intermittant claudication to homocystinuria also show improvements in endothelial dysfunction and/or some related parameters, testifying to Vitamin C's miraculous ability to "help just where needed." For all of the above reasons - endothelial function, lowered blood pressure, decreased arterial stiffness and vasodilation, Vitamin C shoud be a significant help in improving erectile dysfunction as well. Of course, the question is this: is there an actual study showing Vitamin C as improving erectile dysfunction similar to the Well-Documented Erectile Supplements I discuss elsewhere on my site?
So now comes the all-important question: has Vitamin C been shown in the studies to improve erectile dysfunction directly? The answer is 'no' - at least as far as I know. So the hard evidence is not there. However, there are some good signs and research that point vigorously to such a conclusion;
a) Heart Disease Reduction. One study found a 25% reduction in heart disease when comparing those taking greater than 700 mg/day versus those who took no supplemental Vitamin C. This is a significant difference for just one vitamin and is more remarkable considering the fact that the authors used a pool of 7 studies to come up with results.  Again, anything that improves heart disease is very likely to improve one's erections and hardness factor.
b) Frequency of Sexual Intercourse. One study of healthy young males found that Vitamin C increased the intercourse frequency. The dosage was definitely in the megadose range (3 grams/day), but who cares?!?
Finally, Vitamin C very likely protects your arteries not just with shorter term endothelial dysfunction but in the long term as well. Examples of this abound, including the recent discovery that Vitamin C can lower inflammation (C-Reactive Protein) in at risk men. See my link on How to Reduce Inflammation for more information. There are many other properties of Vitamin C that will do the same, including its ability to lower cortisol and boost mood, all documented in The Many Benefits of Vitamin C.
CAUTIONS: Are there any cautions associated with Vitamin C use? Well, any supplement as studies as Vitamin C is bound to have a few black eyes along the way and discuss those in my link on Are There Risks with Vitamin C?
DOSAGE: As of this writing, I take 1.5 grams of Vitamin C divided in three doses of 500 mg via Ester-C. (There are now "generic" versions of Ester-C that are less expensive, but Vitamin C is inexpensive to begin with. This dosage is definitely megadosing, something I normally do not like to do. However, my justification for this is that humans are one of the only animals that does not make its own Vitamin C and, therefore, it looks like this was a "bad" mutation that severely decreased our levels of this all-important molecule. Again, though, read my discussion of Vitamin C - Angel or Devil? for the counterargument.
CAUTION: If you have a medical condition or are on any medications, please discuss any changes with your doctor first. Certain supplements, foods and even juices can alter absorption rates of certain medications for example. Play it safe.
2) Circulation, 1999, 99:3234-3240, "Long-Term Ascorbic Acid Administration Reverses Endothelial Vasomotor Dysfunction in Patients With Coronary Artery Disease"
3) Circulation, 1996, 93: 1107-1113, "Ascorbic Acid Reverses Endothelial Vasomotor Dysfunction in Patients With Coronary Artery Disease"
4) Free Radic Biol Med, 2000 May 1, 28(9):1421-9, "How does ascorbic acid prevent endothelial dysfunction?"
5) Free Radic Biol Med, 2004 Jan 1;36(1):123-30, "Coronary endothelial dysfunction is not rapidly reversible with ascorbic acid"
6) Am J Physiol Heart Circ Physiol, 2001 Feb, 280(2):H528-34, "Effect of ascorbic acid treatment on conduit vessel endothelial dysfunction in patients with hypertension"
7) J Cardiovasc Pharmacol, 1999 Nov, 34(5):690-3, "Oral vitamin C reduces arterial stiffness and platelet aggregation in humans"
8) American Journal of Hypertension, Apr 2007, 20(4):392–397, "Supplementation With Vitamins C and E Improves Arterial Stiffness and Endothelial Function in Essential Hypertensive Patients"
9) Clin Cardiol, 2002 May, 25(5):219-24, "Vitamin C preserves endothelial function in patients with coronary heart disease after a high-fat meal"
10) Am J Clin Nutr, 2004 Dec, 80(6):1508-20, "Antioxidant vitamins and coronary heart disease risk: a pooled analysis of 9 cohorts"
11) Biological Psychiatry, 15 August 2002, 52(4)371-374, "High-dose ascorbic acid increases intercourse frequency and improves mood: a randomized controlled clinical trial"
12) Journal of Biological Chemistry, 276, 40-47, "L-Ascorbic Acid Potentiates Endothelial Nitric Oxide Synthesis via a Chemical Stabilization of Tetrahydrobiopterin"
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