Response to yohimbine was not dependent on patient age. Patients who showed a positive response had fewer medical risk factors overall, although the small number of patients was not large enough to provide statistical significance. The positive clinical response was verified subjectively both by the formal questionnaire and by the in-office clinical encounter. The positive response was verified objectively by measuring nocturnal penile tumescence and rigidity with the RigiScan™ home monitor. The trend of the baseline penile erectile response was better in the responders, suggesting that use of yohimbine might be more effective in patients who have less severe erectile dysfunction. Some authors have questioned the effect of yohimbine on penile activity, but either inadequate doses of yohimbine were used or only tumescence was measured,21,32 often in an office setting where anxiety and embarrassment might affect results.
Ancient Incans consumed this energizing Peruvian plant before battle or a bout of sex, Chris Kilham, an ethnobotanist at the University of Massachusetts at Amherst, told Outside Online. Maca increases sexual appetite, stamina, endurance, and fertility. One 2008 study conducted at the Depression Clinical and Research Program at Massachusetts General Hospital in Boston found that maca helped people with antidepressant-induced sexual dysfunction to regain their libidos.
While balancing your sexual focus is singularly the most important aspect of solving a sexual dysfunction challenge, it's important to also address the physical component. This is especially true if you are over 40, or suffer from erectile dysfunction. Exercise increases blood flow and helps your body eliminate toxins. As well as this, exercise also improves your strength, stamina and form.
So, in establishing physiology, pharmacology, clinical results and safety, zinc is a good choice when you look at cost and side effect profile as well as ease of availability and interaction profile with other meds and other medical conditions.  Having said all of this, there is no bulletproof evidence out there guaranteeing that increasing your zinc consumption either in food or via a supplement will improve ED or increase libido.  Even if a patient experiences an increase in testosterone from such a supplementation, this is not a certain gateway to resolution of theses symptoms as there is more to it than just one hormone level.  However for those that are experiencing problems in these areas, it is certainly worth a try for them.  The patient should be mindful however that supplements should be treated like any other medication and trying to increase your testosterone shouldn’t be done without consultation with your doctor and pharmacist.  You should also check for any interactions with any meds or medical conditions before trying any supplement as well.
Yohimbe has been found to increase circulation to the erectile tissues; aiding in the resolution of physiological and psychogenic (mental/emotional) impotence. Impotence, the inability to sustain erection, is the most common sexual disorder among men. Yohimbine is the active component found in yohimbe bark. Yohimbine has been shown to dilate the blood vessels and lower blood pressure, which enlarges the vessels in the sexual organs and increases reflex excitability in the lower spinal cord. In many cases, yohimbe has shown to make erections firmer. It is thought to help sustain an erection by causing compression and preventing blood to flow back out of the penis while sexually aroused.

The RigiScan™ portable home monitor recorded nocturnal penile tumescence and rigidity testing. The monitor's quantitative analysis software quantitates various parameters of tumescence and rigidity, which includes the area under the curve over time slept, reported as tumescence activity units and rigidity activity units. The reproducibility and accuracy of this technique have been reported.28 Baseline normal values were used as previously reported,29 Rigidity had to be at least 60% at the base and 50% at the tip and maintained for at least 10 min. At least half of the episodes had to meet these criteria, with a minimum of three or four episodes per night. Tumescence had to achieve a height of 3 cm at the base and 2 cm at the tip.

According to the Centers for Disease Control and Prevention, ingesting levels of zinc in excess of the recommended dietary amount will result in diarrhea, vomiting, and stomach cramps. The maximum amount of daily zinc consumption recommended is 40 milligrams per day. Symptoms of too much zinc intake include nausea and headaches. If you have reason to suspect you have ingested too much zinc, contact a medical professional.
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