Por favor, recuerda tratar estos temas con tu doctor.
Progesterona en los Hombres
Progesterone is known for being one of the "female hormones," since it plays a
significant role in ovulation, pregnancy and fertility in women. What most
men don't realize is that plasma levels of progesterone are surprisingly high in
men and appear to play a significant role in male sexual and general health.
Many alternative and anti-aging physicians are actually using progesterone to help cure
erectile dysfunction and other male-related health issues. Although progesterone
therapy has certainly not gone mainstream in men, it certainly has many
impressive benefits, which are outline below.
Again, here are some reasons progesterone is growing in popularity for
middle-aged and beyond men:
CAUTION: Progesterone should only be administered under the care of a
1. 5-Alpha-Reductase Inhibition. This enzyme is responsible for
converting testosterone into DHT. DHT is a powerful hormone in males and
is responsible in part for libido, muscle growth and many other male functions.
However, too much DHT can be hard on the prostate and lead to hair loss.
Progesterone, which decreases with aging, is a significant inhibitor of 5-alpha
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2. Noradrenaline Control and Reduction. It looks progesterone can
help control and even reduce noradrenaline.
 This stress hormone is known for being the "anti-erection" hormone in
the sense that it actually provides necessary feedback from men getting
spontaneous erections. However, too much noradrenaline puts the brakes on
one's hardness factor.
3. High Blood Pressure. Progesterone, likely from the effects of #2,
can improve blood pressure a little in men and, of course, hypertension is one
of the leading risk factors for erectile dysfunction.  For more information,
see this link on High Blood Pressure and Erectile Dysfunction.
4. Sleep Improvement. Progesterone plays an important role in sleep and
sleep quality. 
5. Bone Mass. Some physicians insist that progesterone can increase
bone mass in men with osteopenia and osteoporosis.
Are their any risks associated with increasing progesterone levels? Here
are a few to consider and discuss with your physician:
1. DHT. Yes, limiting DHT in aging males can be of some benefity.
However, potentially this can impact libido and sexual function since DHT plays
a pivotal role in male sexual health.
2. Lack of Research in Men.
Progesterone therapy in men has not been nearly as well-studied as testosterone
therapy. There are a number of progressive physicians who have used it, but
ideally that should really should be verified in some longer term studies before
widespread adoption. Some argue that it should be safe as long as you
restore to normal physiological levels. Again, it would be nice to have
3. Gynocomastia. Progesterone and progesterone receptors play a role
in male gynocomastia ("bitch tits") in men. Furthermore, elevated levels of
progesterone have been documented to increase the risk of gyno at least in some
men.  (Estrogen and progesterone are the engines of breast development in
4. Sedative Effect. Progesterone can have
a relaxing effect. 
Unfortunately, anything that has even a mild sedative effect can have a negative impact on
libido and/or erections. On the other hand, progesterone can improve
sleep, which will generally help improve sexual function.
Psychoneuroendocrinology, Apr 2004, 29(3):339–354, "Administration of
progesterone produces mild sedative-like effects in men and women"
2) The Journal of Clinical Endocrinology & Metabolism, Jan 1 1974, 38(1):142-147,
"Inhibition of Testosterone Conversion to Dihydrotestosterone in Men Treated
Percutaneously by Progesterone"
3) Clin Endocrinol (Oxf), 1980 Nov, 13(5):409-12, "Leydig cell tumour of the
testis with gynaecomastia and elevated oestrogen, progesterone and prolactin
levels: case report"
4) Plast Reconstr Surg, 2000 Oct, 106(5):1011-3, "Estrogen and progesterone
receptors in gynecomastia"
5) Gynecol Obstet Invest, 1993, 36:234–238, "Progesterone Reduces Sympathetic
Tone without Changing Blood Pressure or Fluid Balance in Men"
6) Br Med J (Clin Res Ed), 1985 Jan 5, 290(6461):13–14."Natural progesterone and
7) The Aging Male, 2004, Vol. 7(3):236-257, "Progesterone: the forgotten hormone