According to the FDA (Food and Drug Administration), many of these products sold on the internet contain potentially harmful compounds. And they aren’t listed on the label. In an investigation, the FDA found that one-third of these online supplements were laced with undisclosed ingredients. This includes sildenafil—the active ingredient in Viagra. Doctors prescribe Viagra to some patients, but it’s not safe for everyone. The drug could interact with other medications and lower your blood pressure to dangerous levels. This makes ordering supplements online risky. You don’t know whether they contain sildenafil or other ingredients that could harm your health. 
Male erectile dysfunction (ED) has been defined as the persistent inability to attain and/or maintain an erection sufficient for sexual performance (1). ED is very common, and its prevalence as well as severity increases with age (2). It has been recognized that the major cause of ED is atherosclerosis affecting the pelvic vasculature (3). The presence of ED has been known to predict future cardiovascular disease, and early detection may allow timely modification of remediable risk factors, or lead to the diagnosis of occult cardiovascular disease (4, 5).
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I'll explain the best exercises for sex below. Know that if you suffer from PE or ED you also need to change the way you are thinking about sex to gain full control of yourself. Not just during sex, but in the lead up to sex as well, so you can reprogram your brain to achieve hard and in control. I explain this in the following video which is taken directly from my Sex Mastery program:

According to a study conducted by the University of the West of England, Bristol, pelvic floor exercises may be very effective in treating erectile problems. Many participants of the study, all of whom were men who had been experiencing erectile dysfunction for at least six months, reported a significant improvement of their condition within three months of training their pelvic floor. 
Taking zinc in supplement form is just one of many treatments for those looking for help with ED. Many men use supplements either to replace prescription medications like Viagra and Cialis, or to enhance the effectiveness of these medications. Some other natural supplements aimed at relieving ED symptoms include Korean red ginseng, L-Arginine, carnitine, and DHEA.
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