Ginseng
Data from animal studies have shown a positive correlation among ginseng, libido, and copulatory performances, and these effects have been confirmed in case-control studies in human.
Research
Ashwaganda
Overweight men aged 40–70 years with mild fatigue were given a placebo or an ashwagandha extract.The control group saw increased levels of DHEA-S and testosterone.
Tongkat Ali
The combination of Eurycoma longifolia and concurrent training improved erectile function and increased total testosterone levels in men with androgen deficiency.
Maca Root
An improvement in sexual desire was observed with Maca since 8 weeks of treatment.
Magnesium
Magnesium supplementation has proven benefits for treating symptoms of daily psychological stress (fatigue, irritability, sleep). It has been shown that subjects with mental and physical stress can benefit from a daily magnesium intake.
L-Arginine
Most experimental and clinical studies clearly show a beneficial effect of L-arginine on endothelium in conditions associated with its hypofunction and, thus, with reduced nitric oxide synthesis.
Tribulus Terrestris
The results of the present systematic review showed that the consumption of T Terrestris L., in general, resulted in the improvement of sperm parameters.