Please discuss everything with your doctor first. | Research-Backed Erectile Supplements
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4. Morning Erections. Morning erections are critical for penile health and experts believe that the lack of them can contribute to erectile dysfunction. Researchers believe that the internal tissues or oxygenated during this critical time while you are sleeping. Reseachers have found that if your testosterone gets low enough, morning erections can diminish or even vanish altogether. 
5. Libido. It is no secret that testosterone and libido go together.  I cannot tell you the number of emails that I have received from men who have lost interest in sex altogether and, of course, they almost always have low testosterone levels. Low libido can lead to many erectile issues, since it can strain relationships, dulls desire and leads to decreased sexual activity and erections.
6. Mood and Depression. Testosterone has a monumental effect on the male brain and many studies have shown that low levels ead to depressive (and other related) symptoms.  This can create a vicious cycle as depression, in turn, can lower testosterone.
So, as always, the bottom line is get tested if you have any Symptoms of Low Testosterone and/or symptoms of erectile dysfunction - one root cause could definitely be hormonal. And here's a teaser for my new book as well: if you want to know the exact levels at which testosterone and erectile dysfunction collide, including surrounding issues such as morning erections and venous leakage, please check out Low Testosterone By The Numbers for further details.
1) Fertil Steril, 1995 May, 63(5):1101-7, "The effect of androgen on nitric oxide synthase in the male reproductive tract of the rat"
2) Int J Impot Res, 1995 Dec, 7(4):209-19, "Nitric oxide mediated erectile activity is a testosterone dependent event: a rat erection model"
3) Journal of Andrology, 18(5):522-527, "Relationship between sleep-related erections and testosterone levels in men"
4) The Journal of Clinical Endocrinology & Metabolism, Jul 1 2006, 91(7):2509-2513, "The Relationship between Libido and Testosterone Levels in Aging Men"
5) Asian Journal of Andrology, 2010, 12:136–151, "Androgens and male aging: current evidence of safety and efficacy"
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