Testosterone and Vitamin D
What if I told you a $4 bottle of a simple vitamin may actually increase your
testosterone? In fact, the research strongly suggests that Vitamin D will, for a
substantial percentage of you, likely increase your testosterone.
deficient in Vitamin D, and a huge percentage of men are for a wide variety of
reasons, just a few cents per day will likely substantially boost your
Researchers have known from an earlier animal study that this was likely the
case.  This
study looked at mice that genetically could not produce adequate Vitamin D
levels. As I have mentioned in my link on Vitamin D, Vitamin influences
literally hundreds of processes and chemical reactions in the body and one of
them affects testosterone.
The researchers found that it does this through two primary mechanisms: 1)
calcium balance and 2) aromatase regulation. Vitamin D's primary purpose,
you may recall, is to control the amount of calcium in our tissues and, calcium,
as it turns out, is critical for everything from our bones to our neurons.
For example, the researchers found that by supplementing these mice with
calcium, they could partially restore their hormonal levels. However, a
complete restoration was not achieved because Vitamin D also affects aromatase
activity. Aromatase is the critical enzyme that converts testosterone to
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The results were so pronounced that it seemed like an obvious connection, but
confirmation in a human study was needed. This occurred almost a decade
later in a human study of 2,299 men with signs of heart disease, i.e. had been
referred for an angioplasty.  Researchers found just what we would expect:
the men with the lowest levels of Vitamin D had the lowest levels of testosterone
and the men with highest levels of Vitamin D had the highest levels of
Of course, the acid question is if Vitamin D supplementation can actually raise
Vitamin D levels in men? Fortunately, researchers have begun looking at
this basic question. They started with overweight, nondiabetic, healthy
men with lowish testosterone levels and gave them a little over 3000 IU of
Vitamin D per day. Also, these men had what they considered to be low
Vitamin D levels of less than 50 nmol/l.
What happened was remarkable: total, bioavailable and free testosterone
levels increased by 25.2%, 20.0% and 20.3%, respectively.  Now this isn't
going to cure one's hypogonadism, but it is a nice boost just from taking a
cheap supplement, eh?
Of course, this is just one study but there are a hundred other
Great Reasons for Men to Take
Vitamin D, including muscle growth, fertility, cancer prevention and exercise performance as well In addition, you can do a simple at home test to
evaluate your Vitamin D levels, but I would recommend working with your doctor
CAUTION: Recent research has shown that there is likely a rather narrow band where Vitamin D provides benefits and, furthermore, shows
that high Vitamin D may actually be harmful. Check out my page on The Potential Dangers of
High Vitamin D for more information.
Again, the bottom line is that there are a lot of guys out there wondering where
their testosterone has gone, when, in reality, it's simply that they are
deficient in this all-important vitamin. Being indoors a lot, using sunscreen,
having darker skin, being outside during non-peak hours - all of these things
can lead to deficiencies in Vitamin D and, therefore, lowered testosterone
1) Endocrinology, Apr 2000, 141:1317-1324, "Vitamin D is an important factor in
estrogen biosynthesis of both female and male gonads"
2) Clin Endocrinol (Oxf), Dec 29 2009, "Association of vitamin D status with
serum androgen levels in men"
3) Horm Metab Res, 2011 Mar, 43(3):223-5, Epub 2010 Dec 10, "Effect of vitamin D
supplementation on testosterone levels in men"