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Zyrexin is not approved by FDA..
The ingredients are L-arginine which can be cause nausea,stomach cramps,allergic reaction,electrolyte imbalance.
Yohimbe can result in increased heart rate and blood pressure.
Epimedium can also increase heart rate and mood swings.
So it's good to see your family doctor for a clinical exam as most of cases of ED at your young age are caused due to psychological factors like Stress,depression,anxiety about poor performance,relationship issues.
If you have nocturnal or morning erection then physical cause are less.
You can take Zyrexin after consulting your doctor.
Hope this helps.