Evidence
Medical Studies Penis Enlargement
The published literature this clinic relies on, including the studies that complicate the picture.
Reading list
What the research says.
Nonsurgical Medical Penile Girth Augmentation: Experience-Based Recommendations
Aesthetic Surgery Journal
Consensus recommendations on technique for hyaluronic acid girth augmentation, including plane of placement and volume staging. Directly informs how the Androfill procedure is performed.
Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15,521 men
BJU International (Veale et al., 2015)
The reference dataset for normal penile dimensions. Mean erect circumference 11.66 cm (SD 1.10). Powers the percentile figures in our girth estimator.
Psychological Outcomes of Penile Augmentation
Sharp & Oates
Examines satisfaction and psychological outcome after augmentation, including the role of body image and the poor outcomes seen in body dysmorphic disorder.
Collagen production and hyaluronic acid
Review literature
Background on how hyaluronic acid behaves in soft tissue, its resorption profile, and why it can be enzymatically dissolved.
Penile Girth Enhancement with Hyaluronic Acid Filler: Safety and Complication Profile
Peer-reviewed andrology literature
Reports complication rates for HA girth augmentation, the value of blunt cannula technique, and hyaluronidase availability as the key safety measure.
Two honest caveats. First, the evidence base for penile filler is smaller than for facial filler — sample sizes are modest and long-term follow-up is limited. Second, the erect-girth percentiles everyone quotes rest on a subset of 381 men, so treat them as indicative rather than exact. Any clinic presenting this field as settled science is overstating it.
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About this page
Last reviewed on 30 July 2026.
Medically reviewed by Dr Gary Horn — founder of Androfill, consultant plastic and reconstructive surgeon and uro-andrologist, GMC 4267803.
General information only, not a substitute for a consultation. Individual results vary from person to person.