Fill in Istanbul · The penile filler programme of Hardrock Clinic, led by Assoc. Prof. Dr. Zulfu Sertkaya · Istanbul, Turkey

WhatsApp +90 530 322 90 26

Dr. Zulfu Sertkaya Hardrock Clinic · Istanbul

Penile Filler Results and Realistic Expectations

What hyaluronic acid filler changes, how large the change tends to be, how it looks and feels as it settles, and how long it lasts — with published evidence and the clinic’s own figures kept apart.

Medical reviewer
Assoc. Prof. Dr. Zulfu Sertkaya, urologist and andrologist, FEBU
Published
Last medically reviewed
Physician review pending
Last updated

In brief

The short answer

Short answer

Published studies of hyaluronic acid penile filler most often report a mean flaccid girth gain of around 2–2.5 cm, lasting roughly a year on average with wide variation. Hardrock Clinic reports larger figures from its own caseload — approximately +4, +6 and +8 cm from 10, 15 and 20 ml — but these are not guaranteed. The penis looks larger immediately afterwards than it will once swelling settles, and individual results vary.

Results

Girth: what published studies report

Mean flaccid gain, 324-man audit (abstract, 2025)
2.5 cm
Mean gain at 48 weeks, randomised trial (2019)
16.95 mm
Gain at 12 months, 38-man series (2022)
2.44 cm
StudyMenFinding
Raheem et al. 2025 (conference abstract)324Mean flaccid gain 2.5 cm (range 1.5–4 cm) at a mean volume of 15 ml (range 10–30 ml); satisfaction 89%
Yang et al. 2019 (randomised trial)72Mean gain 16.95 mm with hyaluronic acid at 48 weeks; 43.1% of participants dropped out
Yang et al. 2020 (randomised trial)67Girth still above baseline 18 months after a single treatment
Zhang et al. 2022 (case series)38Gain of 2.44 cm at the end of 12 months’ follow-up
Designs, volumes and measurement methods differ between studies, so these figures are not directly comparable. A 2021 systematic review of 57 studies rated the overall evidence quality as low.

Results

Girth: what the clinic reports

10 ml — clinic-reported, not guaranteed
≈ +4 cm
15 ml — clinic-reported, not guaranteed
≈ +6 cm
20 ml — clinic-reported, not guaranteed
≈ +8 cm

These are Hardrock Clinic’s own figures from its caseload. They are not trial results, they have not been independently verified, and they sit above the published means shown in the section above. Differences in measurement method, timing and volume can all contribute to that gap, which is why the two sets of figures are shown separately rather than blended.

Treat the clinic figures as a description of what the clinic has observed, not as a target you should expect to reach. The same volume produces a smaller measured change on a longer or already-wider shaft, as the 10 ml vs 15 ml vs 20 ml guide explains.

Results

Immediate swelling versus the final result

First 24 hours

Swelling, tenderness, temporary asymmetry and mild bruising are common. Volume looks larger than the settled result.

Days 2–7

Swelling begins to settle. The size you see starts to come closer to the eventual result.

Following weeks

The final contour develops and symmetry is assessed. Follow-up is arranged if required.

The biggest source of disappointment after penile filler is judging the result too early. The first-day appearance includes swelling, so it overstates the final gain; equally, temporary asymmetry in the first days is not a reliable guide to how even the result will be. Wait for the settling period before measuring or deciding whether you want more. The recovery guide gives the full timeline.

Results

Symmetry, touch and appearance

The gel is delivered in small amounts through several entry points, then moulded and checked for symmetry at the end of the procedure. A well-distributed gel is intended to feel soft and look natural, blending with the shaft rather than sitting as a visible ridge.

That is the intention, not a guarantee. Published series report irregularities that patients can see or feel:

  • In the 324-man audit, asymmetry occurred in 6.1%, lumps in 4.6% and migration of gel towards the foreskin in 7.7%. All were managed, with hyaluronidase, additional filler or oral antibiotics.
  • In a 155-man series (conference abstract; the authors declare an industry relationship with the filler maker), 12.3% needed cosmetic correction.
  • Separately, 1.2% of men in the audit disliked the result and asked for it to be dissolved.

Because hyaluronic acid can usually be dissolved with hyaluronidase, irregularities are often correctable, although more than one session is sometimes needed. Correction is priced case by case according to clinic policy and physician assessment. Men with a foreskin should read penile filler for uncircumcised men, and the risks page covers every documented complication.

Results

How long results last and maintaining them

Hyaluronic acid is gradually broken down by the body, so the result fades over time rather than disappearing overnight. The 324-man audit reported a mean longevity of 12 months, ranging from 9 to 24 months. In one randomised trial girth was still above baseline 18 months after a single treatment, and another hyaluronic acid series followed men for 18 months.

Men who want to keep the result generally need further treatment at some point. A top-up is priced case by case according to clinic policy and physician assessment; filler beyond the original package is not included. The timing is a matter for review with the physician, based on how the result has held. For what shortens or extends duration, see how long penile filler lasts.

Results

Why results vary between men

Individual results vary, and the reasons are mostly anatomical. Shaft length and starting girth determine how thinly a given volume is spread; tissue laxity affects how much gel the dartos layer can hold evenly; foreskin anatomy affects the risk of migration and swelling. How the body breaks down the gel also differs from person to person.

This is why the physician confirms the volume at an in-person assessment, measures baseline circumference first, and may revise the volume down. It is also why honest before-and-after comparisons depend on measurement rather than photographs alone — the before and after guide explains how change should be measured.

Questions

Common questions

How many centimetres will I gain?

No one can promise a number. Published studies mostly report mean gains of around 2–2.5 cm; the clinic reports approximately +4, +6 and +8 cm from 10, 15 and 20 ml from its own caseload, not guaranteed.

Why does it look bigger straight after treatment?

Swelling. In the first 24 hours the volume looks larger than the settled result; swelling begins to settle over the first week and the final contour develops over the following weeks.

Will it feel natural?

A well-distributed gel is intended to feel soft and natural, but lumps and asymmetry can occur. They can often be corrected, usually with hyaluronidase.

Does filler change length or erections?

No. It adds girth only and does not lengthen the erect penis or change erectile function.

More answers are collected on the penile filler FAQ page.

Next step

Ask about your own anatomy

General information cannot tell you whether this treatment suits you. The patient coordination team can answer practical questions, and suitability and volume are decided by the physician at an in-person assessment.

Sources

References

Published sources cited on this page. Conference abstracts are identified as such; they have not been through full peer review as journal articles.

  1. Raheem A, Konstantinidis C, Abdel-Raheem T. Penile girth enhancement with hyaluronic acid injection: a single-center study. J Sex Med. 2025;22(Suppl 2):qdaf077.122 (conference abstract). doi:10.1093/jsxmed/qdaf077.122
  2. Yang DY, Ko K, Lee SH, Lee WK. A comparison of the efficacy and safety between hyaluronic acid and polylactic acid filler injection in penile augmentation: a multicenter, patient/evaluator-blinded, randomized trial. J Sex Med. 2019;16(4):577-585. doi:10.1016/j.jsxm.2019.01.310 · PubMed 30833149
  3. Yang DY, Jeong HC, Ko K, Lee SH, Lee YG, Lee WK. Comparison of clinical outcomes between hyaluronic and polylactic acid filler injections for penile augmentation in men reporting a small penis: a multicenter, patient-blinded/evaluator-blinded, non-inferiority, randomized comparative trial with 18 months of follow-up. J Clin Med. 2020;9(4):1024. doi:10.3390/jcm9041024 · PubMed 32260508
  4. Zhang CL, Quan Y, Li H, et al.. Penile augmentation with injectable hyaluronic acid gel: an alternative choice for small penis syndrome. Asian J Androl. 2022;24(6):601-606. doi:10.4103/aja20223 · PubMed 35417989
  5. Kwak TI, Oh M, Kim JJ, Moon DG. The effects of penile girth enhancement using injectable hyaluronic acid gel, a filler. J Sex Med. 2011;8(12):3407-3413. doi:10.1111/j.1743-6109.2010.01748.x · PubMed 20233296
  6. Carey B, Baylor A, Pearlman A, et al.. Efficacy of novel hyaluronic acid dermal filler injections for penile girth enhancement. J Sex Med. 2024;21(Suppl 1):qdae001.206 (conference abstract). doi:10.1093/jsxmed/qdae001.206
  7. Romero-Otero J, Manfredi C, Ralph D, et al.. Non-invasive and surgical penile enhancement interventions for aesthetic or therapeutic purposes: a systematic review. BJU Int. 2021;127(3):269-291. doi:10.1111/bju.15145 · PubMed 32575166
  8. King M, Convery C, Davies E. This month’s guideline: the use of hyaluronidase in aesthetic practice (v2.4). J Clin Aesthet Dermatol. 2018;11(6):E61-E68. PubMed 29942426
WhatsApp Ask the team