Icariin is a substance that exists within Horny Goat Weed plants (which are actually called Epimedium plants).
The key factor to note here is that it is the icariin found within Horny Goat Weed that is responsible for all the positive health benefits gained from taking the extract.
Because icariin has been shown to markedly increase a mans 'free testosterone' ratio, it, in turn, works extremely well at increasing male sex drive, or as many may say:
"It gave me back my mojo!"
As well as improving levels of 'free testosterone', icariin is also proven to be nature's most potent natural booster of 'nitric oxide' levels.
Nitric oxide is the most important springboard for signaling the male body to deliver a healthy and consistent supply of blood to the penis. Without adequate nitric oxide signaling, erections will either be semi-hard, short-lasting or both!
Not at all!
To get a good solid benefit from taking icariin, you need to look for a Horny Goat Weed supplement containing an extract that has been 'standardized' to a percentage of 60% icariin. Less of a percentage not being as potent, and higher of a percentage risking being less potent due to loss of active icariin flavonols through overly invasive extraction/processing.