I haven't found corroboration for this yet, but something to think about from "The Natural Testosterone Plan" by Stephen Harrod Buhner:
Hops is best known for its use in beer. The majority of physicians and
men overlook its potent chemicals and do not realize that beer itself
can significantly alter the male androgen levels. German beer makers
noticed long ago that the young women who picked hops in the fields
commonly experienced early menstrual periods. Eventually, researchers
discovered the reason – hops is perhaps one of the most powerfully
estrogenic plants on Earth. Just 100 grams of hops (about 3.5 ounces)
contains anywhere from thirty thousand to three hundred thousand IUs
of estrogen, depending on the type of hops. Most of it is the very
potent estrogen estradiol. Estradiol, as it is taken into the male
body, causes a direct lowering of testosterone levels in the testes
and an increase in SHBG levels, which then binds up even more free
testosterone in the bloodstream. The estradiol in hops has also been
found to directly interfere with the ability of the testes Leydig
cells to produce testosterone. The presence of this highly estrogenic
substance in beer is not an accident.
Prior to the German Beer Purity Act of 1516, beer almost never
contained hops. In fact, more than one hundred different plants were
used in brewing beer for at least ten thousand years prior to the
introduction of hops in the middle ages. For the last thousand years
of that period, the most dominant form of “beer” was called gruit,
which contained a mixture of yarrow, bog myrtle, and marsh rosemary.
These herbs, especially in beer, are sexually and mentally
stimulating. (It is rare to become sleepy when drinking un-hopped
beers.) The Catholic Church had a monopoly on the production of gruit,
but competing merchants and the Protestants worked together to break
their monopoly and force the removal of all sexually stimulating herbs
from beer. They replaced them with an herb that puts the drinker to
sleep and dulls sexual drive in the male. The legislative arguments of
the day all hinged on the issue of the stimulating effects of other
herbs that were used in beer. A pilsner, for example, was originally a
henbane beer (pilsen means “henbane”), which is an incredibly strong,
psychoactive beer, used earlier in history by German berserkers before
battle. The German Beer Purity Act was, in effect, the first drug
control law ever enacted.
Beer, so highly touted as sexy in television commercials, in actuality
can powerfully inhibit sexual strength in men. There is a well known
condition in England – Brewer’s Droop – that occurs from middle-aged
brewers’ extensive handling of hops plants. The plant chemistries
readily transmit through the men’s skin just as they did in the young
women in the fields. Very few physicians have looked at any
correlation between beer drinking and androgen levels or erectile
dysfunction problems in their patients. (How many men on Viagra are
heavy beer drinkers?) However, the physician Eugene Shippen in The
Testosterone Syndrome comments that one of his patients undergoing
pharmaceutical testosterone replacement therapy, showed no response to
the testosterone until he reduced his beer intake to one or two beers
a night from six to seven. Hops is extremely potent and its
consumption should be limited if not completely excluded during all
androgen replacement therapy. These effects can be exacerbated if the
beers you buy also contain licorice (see Licorice section at beginning
of chapter), a fact that will not be noted the beer label.