CriterionAndropenisSizeGeneticsProExtenderX4 Labs Extender
6 months size gain36% erect state
32% flaccid state
Approx 30%29% erect stateAverage 33%
Reputation5 stars4 stars3.5 stars4 stars
European Health Cert (CE)YesYesNoYes
US FDA RegistrationYes1NoNoNo
Medical Journal ReportBJU International 2NoNoNo
Doctor EndorsementsYesYesYesYes
Customer Support5 stars24/7 online4.5 stars4.5 stars4.5 stars
Quality CertificatesISO 13485:2003
ISO 9001:2008
NoNoNo
Clinical StudiesMore than 12111 in-house
Money Back GuaranteeYesYesYesYes
Price in US$119 to 298200 to 400300 to 400125 to 420
Overall Rating5 stars4 stars3.5 stars4 stars
Product WebsiteAndropenisSizeGeneticsProExtenderX4 Labs

1 The only penis enlargement device in the world with US FDA Approval/Registration . Andropenis also has Canada CMDCAS Health Certificate, Australia ARTG Health Certificate

2 Official Journal of The British Association of Urological Surgeons