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If you are truly paranoid, it can be easy to get sucked in to recent studies. YES some people decide that they will get more affect if they take double the dosage. Most nutritionists will tell you that many people are over eating.
As patients with erectile dysfunctions are more likely to have the microvascular risk factors typically associated with spontaneous NAION, an ischemic effect by type 5 phosphodiesterase (PDE-5) inhibitors,on the optic nerve is plausible, but unlikely. Suspect samples were seized by the Dutch inspectorates outside the official medicines distribution chain over 2005-2006. The analysis data was combined in order to draw a more accurate picture of current trends in the Netherlands and the associated health risk.
I pleaded a bit more for enlightenment, but feeling that no more information was forthcoming and wanting to end the conversation on an up note, we thanked each other and hung up.