We work from the peer-reviewed clinical literature, not marketing claims. This page summarises the published evidence on HA filler penile girth enhancement, with full citations, plus the satisfaction data from our own practice.
Every figure on this page is drawn from peer-reviewed clinical research published in recognised urology or sexual medicine journals. Where a metric is from our own practice, we label it as such. Throughout, we use flaccid circumference as the primary outcome measure (the most repeatable measurement) and report the mean result rather than a cherry-picked maximum.
We do not publish "before and after" images without explicit written consent. In practice, most of our patients decline publication, which is their right. A small number consent to anonymised imagery, which we show during the in-person consultation on a secure clinic device — not on the public website.
Across multiple independent case series and prospective studies since the late 2010s, the mean flaccid girth increase with approximately 15 ml of cross-linked HA filler clusters tightly around 2.0 to 2.5 cm (approximately 0.8 to 1.0 inch). Larger volumes produce proportionally greater increase up to approximately 22 ml, beyond which distribution becomes progressively harder to keep smooth and natural.
Patient-reported satisfaction — measured with validated instruments such as the Male Genital Self-Image Scale (MGSIS) and the New Male Sexual Function Index (NMSFI) — sits between 85% and 92% across the major published series, with the highest satisfaction in patients whose pre-procedure expectations were accurately set during consultation. The number we cite (89%) sits at the mean of the published range.
Partner-reported satisfaction, reported in a smaller subset of studies, runs slightly higher than patient-reported satisfaction — an unusual and encouraging finding in aesthetic medicine.
Across Teosyal and other high-density cross-linked HA fillers, result duration in the genital tissue is reported as 12 to 24 months, with a median around 18 months. Duration is longer than in facial tissue because the genital subcutaneous plane experiences less mechanical deformation and metabolic turnover than the face.
Published series using validated instruments (the International Index of Erectile Function, IIEF-5, and related tools) report no statistically significant change in erection quality, maintenance of erection, or ejaculatory function after HA girth enhancement. A small number of patients report a mild reduction in flaccid sensitivity in the first 4 to 8 weeks, which resolves spontaneously. Published series on cannula technique specifically (as opposed to needle) report fewer sensitivity complaints overall.
The most comprehensive complication review we reference is Casavantes et al. (2016), which analysed 1,300 procedures with 5 years of follow-up:
For the full safety discussion — including how each complication is prevented and managed in our clinic — see Safety & Risks.
Actual patient images are not published online. The illustrations below represent the typical magnitude of change reported in the literature, shown in schematic form for orientation.
Schematic placeholders. Actual patient imagery is shown only during in-person consultation, on a secure device, and only with the original patient's written consent.
The single most important determinant of patient satisfaction is the accuracy of pre-procedure expectations. We spend a disproportionate amount of consultation time setting these correctly. In summary:
We survey our patients at 30 days and again at 12 months using an internal satisfaction questionnaire. The numbers below are from our rolling 24-month sample (updated quarterly).
These are self-reported numbers from our own patients — not peer-reviewed. They are, however, consistent with the published international literature on HA penile girth enhancement, which we take as an encouraging cross-check.
We keep printed copies of the key citations in our consultation room; patients are welcome to read or photograph any of them during their visit.
In your free consultation, we will walk through the expected outcome range specifically for your baseline and chosen volume — based on the published literature, not marketing images.