Xzen Xpress, labelled as dietary supplement, is claimed as the treatment of erectile dysfunction or impotence. The red coloured capsule is manufactured in the United Stated of America by Xzen. Xzen Xpress labelled as a dietary supplement is containing an unapproved natural ingredient blend. However, the notification of the US FDA makes the product more popular than the manufacturer wants. The notification says that the product has been confirmed containing the prescription chemical compounds. Sildenafil and Tadalafil present in the product are prescription chemical compounds, Sildenafil is an approved chemical ingredient of Viagra whereas Tadalafil is an authorised active ingredient of prescription drug Cialis. Additionally, both of the chemical compounds are not listed on the label of the product as it has been labelled as a natural dietary supplement.