Testosterone and Quercetin
I recently had an interesting experience where I suddenly found that
testosterone levels increased by 100-200 ng/dl over previous levels,
representing a 14-33% increase over all my past reads while on
testosterone cypionate. I attributed this to the fact that I had
gone almost entirely vegan in an effort to control my PSA. (Strict
plant-based eating can lower IGF-1 and increase SHBG a little.) However, there is another much
more likely explanation: quercetin. I had also started taking
quercetin (along with turmeric, bromelain and IP6) in an effort to control the
inflammation that they found in my prostate and, after some reading, I
found that quercetin has been found to
increase testosterone levels.
Quercetin, which is a powerful anti-inflammatory phytochemical compound found in
red wine, onions and other plant foods, is particular good at blocking a liver
enzyme (UGT2B17) that tells the kidney to urinate out testosterone.
other words, quercetin allows your testosterone to circulate a little longer. 
Granted, quercetin isn't going to cure a hypogonadal male and double his
testosterone. But it can help a little and it can help many men on HRT .
NOTE: This could be a significant help to men with low SHBG. Low
SHBG levels cause testosterone to be rapidly cleared from the body (through the
urine) and makes HRT often ineffective. Talk to your doctor, but in my
opinion it is likely that quercetin could help with these type of hormone clearance
issues. For more information, see my page on Causes of Low SHBG in Men.
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Quercetin's impact on hormones has been in the spotlight lately, because
the powers-to-be are interested in helping out low SHBG
men or boost male testosterone levels: officials were concerned about possible "doping" issues in sports.
Athletes are always looking for an edge and there was concern that this was being used to alter urine hormone
excretion. (Sometimes I think the winners are likely just the best cheaters.) A little boost in testosterone is nice, but that's just the beginning of the good
news with quercetin, including a few items that will almost for sure help you in
1. Prostate (PSA) Protection. Remember that high inflammation
can inflate your PSA and a high PSA will take you off of HRT. In fact, this
happened to me as I mentioned. My PSA went from 1.4 to 6.3 from one read
to the next! (You can read about my experience here: High PSA But No Cancer.)
I started taking quercetin, because a study on men found that 500 mg of quercetin (with bromelain and papain) twice
daily significantly improved prostatis, which is almost always a inflammatory
issue.  The prostate does not have good blood flow compared to most organs
and thus has trouble clearing out toxins and bacteria. Quercetin can help
with the former.
2. Lowered Blood Pressure and Increased Blood Flow. If there is
one thing that will help you in the bedroom, it's increased blood flow, eh?
Quercetin will lower blood pressure for many men, especially
the ones that need it most, which means it's opening up your arteries and
allowing greater blood flow to your extremities. Nice! I know one
extremity that could always use a little extra blood flow! And one study
found that systolic and diastolic blood pressure were lowered by 7 and 5 mm,
respectively. See my page on Erectile Dysfunction and High Blood Pressure.
Remember that, if you are have good blood pressure, quercetin will probably not help that much.
3. Brain and Dopamine Protection. Recent study work on quercetin and
resveratrol suggest that these can protect you from dopamine depletion and
possibly Parkinson's due to their powerful anti-inflammatory activities.  It
turns out that Parkinson's Disease has a strong component of inflammation that
researchers now believe is one of the key root causes of the condition.
4. Prostate Cancer Protection. Results are preliminary, but it looks
like quercetin has good potential to help your prostate in the battle against
prostate cancer. 
5. Cortisol Control. We're all under chronic stress and one study
showed that quercetin can put the clamp on stress reacitivity, i.e. your body
overproducing cortisol due to various stressors. Researchers found that
rats give (admittedly very high doses) of quercetin limited their production of
a hormone called CRF (corticotropin-releasing factor). 
6. Fertility. Animal studies show that quercetin should boost sperm
quality and fertility. 
7. Protection of Your Testicles. Animal studies also show that
quercetin has your back and can protect your testes from all sorts of dangers -
everything from torsion to toxins. 
DOSAGE: What dosage should you take? Well, first of all, talk to your doc if you have a medical condition or are taking
any medications, because supplements can alter medication absorption and have unintended consequences. However, in my case, my prostate biopsy was found
to have no cancer or pre-cancer (PIN) but rather inflammation. I started taking 250 mg of quercetin (with 125 mg of bromelain) twice daily and later switched
that to one daily. Unfortunately, I am not sure if I was taking 250 mg or 500 mg daily at the time of my increased testosterone read. The reason
that I backed down in dosage was just to move the amount I was taking a little closer to what you could get through food sources.
For example, 5/8 of a cup of red onion would be 100 grams and 100 grams would
supply about 32 mg of quercetin.  So, if I ate 8 red onions, I could get 250
mg of quercetin. Well, okay, that's not too likely, but the point is that
trying to move it into the ballpark range for human consumption and 500 mg
definitely would not do that. That said, remember that in the above study
for prostatitis, which is a very common problem in men, the dosage was 500 mg 2
X daily. And the above blood pressure study was 700 mg daily.
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.
1) Science Daily, Jan 7 2013, "Red wine could mask testosterone
levels, experts warn"
3) Urology, Dec 1999, 54(6):960–963, "Quercetin in men with category III chronic
prostatitis: a preliminary prospective, double-blind, placebo-controlled trial"
4) Journal of Neuroscience Research, Feb 1 2008, 86(2):403–410, "Resveratrol and
quercetin, two natural polyphenols, reduce apoptotic neuronal cell death induced
5) Carcinogenesis, 2001, 22(3): 409-414, "Quercetin inhibits the expression and
function of the androgen receptor in LNCaP prostate cancer cells"
6) Molecular and Cellular Biochemistry, Jul 2006, 287(1-2):109-116, "Quercetin
downregulates matrix metalloproteinases 2 and 9 proteins expression in prostate
cancer cells (PC-3)"
8) Asian Journal of Andrology, Mar 2008, 10(2):249–258, "Stimulating effects of
quercetin on sperm quality and reproductive organs in adult male rats"
9) Andrologia, June 2012, 44(3):164–173, "Quercetin prevents
2,3,7,8-tetrachlorodibenzo-p-dioxin-induced testicular damage in rats"
10) Andrologia, Dec 2010, 42(6):376–383, December 2010"Protective effects of
quercetin on testicular torsion/detorsion-induced ischaemia-reperfusion injury