Studies in both animals and humans show zinc oxide can improve male libido and sexual function in several ways. A 1996 study demonstrated that zinc deficiency in both young and older men can result in erectile dysfunction and that if zinc oxide remains at optimal levels, sexual function in all age groups improves dramatically. Studies in 2009 and 2013 had similar findings. Studies have also linked zinc deficiency to vaginal dryness. A related study from 2013 has another interesting conclusion. Zinc levels can also affect the sense of smell, and studies show that smell is a powerful element of sexual arousal.

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