Give blood and gain erections!

Blood contains iron and too much iron can cause hemochromatosis which basically means iron overload. Iron overload can lead to hypogonadism which means zero production of sex hormones. 

Erectile dysfunction can result directly from iron overload when men do not donate blood, and their blood cannot be replenished.

One study took 40 men that suffered from low testosterone levels, they all took part in donating blood. The result showed all participants had there testosterone levels restored back to normal after part taking in blood donation and Iron levels were balanced. 

Also hypogonadism was reversed as all the extra iron was depleted. 

Donating blood also increases blood flow and increase blood flow to the penis is win for erections. 

So by simply donating blood can do wonders for your man juice.