Long-standing dissatisfaction with girth
The reason we hear most often. It has usually been there since adolescence, and reassurance about being within normal measurements rarely shifts it.
Non-surgical girth enhancement · Istanbul
Private, physician-led penile girth enhancement using hyaluronic acid filler — Fill in Istanbul, the penile filler programme of Hardrock Clinic, Istanbul.
For men who want a proportionate, reversible girth increase without surgery.
Assoc. Prof. Dr. Zulfu Sertkaya performs the treatment and plans it around your penile anatomy, your current circumference and the result you are hoping for.
Free online assessment · No consultation fee · No deposit · Written quote before you travel · Reply within 1 hour (09:00–23:00 Istanbul time)
Procedure counts, hospital affiliation and patient-origin figures are as supplied by the clinic. Board certification, academic rank and training are set out on the physician’s page.
01 — The treatment
Penile filler is the injection of hyaluronic acid gel into the loose subcutaneous layer of the penile shaft to increase its circumference. It is non-surgical, done under local anaesthesia in roughly 30 to 45 minutes, leaves no incision and no surgical scar, and is temporary: the body gradually breaks the gel down.
We use the same class of cross-linked hyaluronic acid gel that facial aesthetic medicine relies on. In its natural form, hyaluronic acid is a glycosaminoglycan found throughout human connective tissue; the injectable version is chemically cross-linked so that it holds its shape and resists rapid breakdown.
Dr. Sertkaya places the gel in the plane between the skin and Buck fascia, the loose, mobile dartos layer.
That plane is chosen deliberately. It lies superficial to the erectile bodies, so the corpora cavernosa, the urethra and the neurovascular bundle are not entered, and it moves freely enough for the gel to be moulded and spread evenly around the shaft once it is in.
Girth is what changes. The treatment does not lengthen the erect penis, does not alter erectile function, and does not treat functional problems or curvature. Those have their own answers, and filler is the wrong tool for them.
Lateral view · 12–14 cm shaft
Cross-section · enlarged detail
Baseline · 9.3 cm is the mean flaccid circumference in published nomogram data of 15,521 men, and the starting point every figure on this plate is measured from.
Basic — 10 cc · Natural and moderate enhancement.
Ask about 10 ccAdvanced — 15 cc · More noticeable but proportionate enhancement.
Ask about 15 ccPremium — 20 cc · Higher-volume enhancement.
Ask about 20 ccWho enquires
The men who write to us are rarely in a range that medicine would call abnormal. They are within the normal range and unhappy with it, and that is a legitimate thing to discuss with a urologist rather than something to wave away.
The reason we hear most often. It has usually been there since adolescence, and reassurance about being within normal measurements rarely shifts it.
Some men notice reduced girth after prostate surgery, Peyronie disease, or a penile implant, where the shaft can feel narrower than before.
Hyaluronic acid is temporary and can usually be dissolved. For men unwilling to accept a permanent surgical change, that tends to settle the question.
No incision, no graft, no general anaesthesia. Most men are back to normal daily activities the same day, subject to their physician’s advice.
A new relationship. Self-consciousness in changing rooms. Anxiety that has gradually narrowed someone’s social or sexual life.
Plenty of men tell us outright that they do not want a dramatic result. A moderate, well-distributed increase is a common and reasonable goal.
When we advise against treatment
If the underlying concern looks body dysmorphic in character, or expectations are fixed on a measurement filler cannot deliver, we do not inject. Establishing that is part of the consultation. Some men hear from Dr. Sertkaya that no volume of filler will produce what they are describing, and that is a legitimate outcome of an honest assessment.
Private enquiry
Send your questions to our patient coordination team on WhatsApp. You will get a straight answer about whether this treatment fits what you are describing, including when the answer is no.
02 — The material
We use hyaluronic acid for penile girth work because it can be dissolved. An enzyme breaks it down, so an unsatisfactory result, a nodule or an over-filled area can usually be reversed, an option that does not exist with permanent materials such as silicone or PMMA.
Much of the urological literature on penile enhancement complications is really about permanent and non-medical materials. Reviews consistently note that hyaluronic acid, used with standardised low-volume technique, carries a lower complication burden than polylactic acid, PMMA, silicone or self-injected non-medical substances. Unlike those materials, its complications also have a medical rather than a surgical answer.
The randomised evidence compares hyaluronic acid with polylactic acid. In an 18-month randomised trial of 67 men published in the Journal of Clinical Medicine in 2020, girth remained significantly above baseline in both groups at 18 months, with no significant difference between the two materials and significantly improved satisfaction in both.
So hyaluronic acid has no demonstrated durability disadvantage against its main injectable competitor, and it keeps the option of reversal. Our hyaluronic acid penile filler guide sets out the evidence in full, with references.
03 — The gel we use
A deep-volume gel holds volume in a mobile subcutaneous plane, which is what penile girth work needs. We use a CE-marked hyaluronic acid filler made in Switzerland: a firm, cohesive gel designed for deep placement and volume support rather than fine-line correction.
Those handling characteristics suit the anatomy. A gel that resists deformation holds a distributed contour better in tissue that moves and stretches, and the manufacturer works to the quality and traceability standards of a mainstream European device manufacturer.
What we have not done is claim that this product is clinically proven for penile use, lasts longer in the penis, or stimulates lasting collagen there. We looked for evidence specific to that application and could not find it.
The gel is CE-marked for deep facial volumisation. It does not carry a specific approved indication for injection into the penis, so using it for penile girth enhancement is an off-label application of a licensed medical device. That is a recognised and lawful practice in which the physician takes personal clinical responsibility for using an approved product outside its labelled anatomical indication.
The same is true of essentially every hyaluronic acid filler used for penile augmentation worldwide, not only of this one. More in the guide to the filler gel.
Who treats you
Urologist & Andrologist · Istanbul, Turkey
Dr. Sertkaya qualified in medicine at Gazi University in 2008 and completed urology specialty training at Haydarpaşa Numune Training and Research Hospital in 2014. He passed the European Association of Urology board examinations in 2017, earning the FEBU title, and was awarded the academic rank of Associate Professor of Urology in 2020.
His practice has been concentrated in andrology since specialisation, and he founded the Hardrock Clinic male health and aesthetics centre in Istanbul in 2022. His clinical focus spans penile aesthetics, penile implant surgery and men’s health. He is the author of peer-reviewed urology research, and he personally performs and medically reviews the treatment described on this site.
FEBU-certified European urologist (2017)
Associate Professor of Urology (2020)
Biruni University Hospital, Istanbul
2,500+ penile procedures performed
Patients from 50+ countries
Penile implants and penile aesthetics
Hospital affiliation, procedure volume and patient-origin figures are as supplied by the clinic. Qualifications, board certification and academic rank are set out with their sources on request.
04 — On the day
Dr. Sertkaya performs penile filler under local anaesthesia, and it takes approximately 30–45 minutes depending on filler volume and patient anatomy. Most men return to normal daily activities the same day, depending on physician advice.
01
Dr. Sertkaya examines you, measures baseline circumference at defined points, and reviews your medical history, medication, previous penile procedures and circumcision status. Volume is decided here, not before you arrive.
02
We mark the entry points and the intended distribution. The plan takes account of shaft length, existing girth, tissue laxity and foreskin anatomy.
03
Local anaesthesia only. You do not need general anaesthesia or sedation.
04
Gel goes in through several entry points in small aliquots, using a fan technique and staying in the dartos layer outside Buck fascia. Spreading small amounts across many points, rather than injecting large boluses, is what reduces the risk of nodules and contour irregularity.
05
The gel is moulded to spread it evenly, and we check the contour all the way round before finishing. Small asymmetries at this stage are common and usually settle.
06
A light dressing, written aftercare instructions and a direct contact number. You go home the same day.
05 — Choosing a volume
Use the volume selector in the treatment section above to see the plate redraw itself. Both views move together, and the one dimension that never moves is the length.
Volume is a medical decision, not a menu choice. The right amount depends on your starting circumference, shaft length, tissue elasticity and foreskin anatomy, and more filler is not automatically a better outcome.
| Volume | Package | Clinic-reported girth change | Typical positioning |
|---|---|---|---|
| 10 cc | Basic | approximately +4 cm | Natural and moderate enhancement. |
| 15 cc | Advanced — most preferred | approximately +6 cm | More noticeable but proportionate enhancement. |
| 20 cc | Premium | approximately +8 cm | Higher-volume enhancement. |
Why does 20 cc not simply mean twice the gain of 10 cc? Circumference is a function of area, and the filler is spread over the surface of the shaft. Distribute the same volume over a longer or already-wider shaft and the measured change in circumference is smaller, so two men receiving identical volumes can measure very differently.
The volume plate is drawn from that arithmetic rather than around it. Because circumference is what the treatment changes, the geometry works backwards from the circumference figure: added girth widens the radius by that figure divided by 2π, which thickens the layer you can see between the skin and Buck fascia.
It is also why the two structures inside that layer, the corpora cavernosa and the urethra, are exactly the same size in all four states. Nothing is being added to them.
Our 10 ml vs 15 ml vs 20 ml guide explains how volume is chosen, and the packages page sets out what each package includes. Send the coordination team your starting measurement and they will tell you which volume is usually discussed for it; the final volume is confirmed at the in-person assessment.
Packages
Three packages, by filler volume. Prices are given as a written quote on request. We accept cash in EUR, USD or GBP, and you do not pay a deposit to hold a date.
Package
10 cc hyaluronic acid filler · price on request
Natural and moderate enhancement.
Clinic-reported girth change: approximately +4 cm. Results vary.
Ask about 10 ccMost preferred
15 cc hyaluronic acid filler · price on request
More noticeable but proportionate enhancement.
Clinic-reported girth change: approximately +6 cm. Results vary.
Ask about 15 ccPackage
20 cc hyaluronic acid filler · price on request
Higher-volume enhancement.
Clinic-reported girth change: approximately +8 cm. Results vary.
Ask about 20 ccTravel option
If you prefer not to arrange travel yourself, the coordination team can organise: 2 nights’ hotel near the clinic, private airport transfers, clinic transfers, and an English-speaking coordinator for the whole visit. This is arranged as a separate written quote; the medical price does not change.
A separate facial aesthetic assessment can be arranged during the same visit. Details and a written quote on request.
written quote on request
Ask on WhatsAppHyaluronic acid filler placed along the jawline or chin, planned according to facial proportions at assessment.
written quote on request
Ask on WhatsAppHyaluronic acid filler for the tear-trough area beneath the eyes, considered only after the skin and underlying anatomy have been assessed.
written quote on request
Ask on WhatsAppAn injection of platelet-rich plasma prepared from your own blood, discussed as a supportive option for erectile function after a urological assessment.
written quote on request
Ask on WhatsAppA consultation about hair loss, in which platelet-rich plasma treatment is discussed where it is appropriate.
written quote on request
Ask on WhatsAppAn assessment of enlarged male breast tissue. This is assessment only; if surgery is indicated, it is arranged separately.
written quote on request
Ask on WhatsAppAdd-ons are optional, assessed for suitability at consultation, and never change the filler price.
06 — What the studies show
Expect to see the added volume immediately, although the honest measurement is taken later. Published series of hyaluronic acid penile girth enhancement most often report a mean flaccid girth increase of around 2 to 2.5 cm. In a 2025 audit of 324 patients treated with a mean of 15 mL, the mean increase in flaccid girth was 2.5 cm, with individual results ranging from 1.5 cm to 4 cm.
All four figures come from the same retrospective single-centre audit of 324 patients, published as a conference abstract in The Journal of Sexual Medicine in 2025. They are not this clinic’s figures and they are not a promise. They are simply the clearest published indication we have of what this treatment typically achieves in practice.
We put them here because they are more useful to you than a marketing number, and because they give you a frame for reading any clinic’s claims, ours included. The clinic’s own reported figures (approximately +4 cm at 10 cc, +6 cm at 15 cc and +8 cm at 20 cc) sit above what published literature currently supports, and we would rather say that directly than leave it unsaid. Read the study figures above as the floor of what is documented, and the clinic’s as what it reports from its own caseload.
The results guide puts the published studies and the clinic’s figures side by side.
Individual results vary according to baseline circumference, anatomy, filler distribution, treatment volume and physician assessment.
Private enquiry
Send your current measurement if you have it, or just describe what you are looking for. We will tell you which volume is usually discussed for that starting point, and what it realistically changes.
07 — Longevity
Around 12–18 months is how long penile filler results commonly remain visible, although longevity varies according to filler volume, metabolism, anatomy and individual tissue response.
The 324-patient audit reported a mean filler longevity of 12 months, with a range of 9 to 24 months, and the 18-month randomised trial found girth still significantly above baseline at 18 months. A 12–18 month figure is therefore a reasonable expectation, with genuine variation either side of it. How long penile filler lasts covers this in detail.
On lasting collagen effects, some tissue remodelling may follow hyaluronic acid treatment, but how much long-term residual enhancement remains varies and should not be considered guaranteed. We do not publish a percentage of permanent retention, because we found no clinical literature supporting such a figure for penile application.
Nobody should promise you permanent enlargement from a resorbable filler.
08 — Afterwards
Recovery is quick for daily life: most men return to normal daily activities the same day. Swelling and tenderness are expected for the first few days, sexual abstinence of approximately 7–10 days is recommended, and the final contour settles over the following weeks.
Swelling, tenderness, temporary asymmetry and mild bruising are common. The volume looks larger than the settled result will.
Swelling starts to settle and the gel integrates. Hygiene is straightforward; avoid strenuous physical activity.
Physician-directed return to sexual activity. We recommend approximately 7–10 days of abstinence.
The final contour develops, symmetry is assessed, and follow-up is arranged if you need it.
Before you leave, Dr. Sertkaya gives you personalised written aftercare instructions for your treatment, including the symptoms that need same-day assessment. Keep the direct contact number you are given at discharge. The recovery guide goes through each stage.
09 — What can go wrong
We will not call penile filler risk-free, because it is not. Published series report predominantly mild and manageable events, and no clinic can promise a complication-free outcome. What we can offer is technique that lowers risk, honest disclosure of what can go wrong, and a plan for managing it.
In the 324-patient audit (a conference abstract), reported complications were migration of filler into the foreskin in 7.7%, asymmetry in 6.1%, filler lumps in 4.6% and infection in 1.5%. All were managed with a dissolving enzyme, additional filler or standard medical care, and no serious adverse events were reported. Separately, 1.2% of patients disliked the result and asked for the filler to be dissolved.
Another series of 155 men, also published as an abstract by authors who declared a relationship with the filler’s manufacturer, found 12.3% required cosmetic correction.
Read those numbers twice, in both directions. They describe a treatment whose complications are usually correctable rather than catastrophic. They also show that a meaningful minority of men need something done afterwards, which is not the impression most clinic websites give. Our risks and safety guide covers warning signs and how filler is dissolved.
10 — Photographs
We do not publish penile before-and-after photographs on this website. Clinical photography is shared privately, on request, during consultation, not on a public page that anyone can reach from a search result.
Patients who consent to clinical photography consent to a clinical context, not to indefinite public circulation.
Public intimate imagery is restricted or prohibited in medical advertising across several of the jurisdictions our patients live in.
Angle, lighting, temperature, arousal state and timing relative to swelling change the apparent result far more than the treatment does.
What we would rather give you is the measurement, the method used to take it, and the published range. If you want to see cases, ask our coordination team and they will share them with you privately. Why we handle before-and-after photographs this way.
Travelling to Istanbul
For international patients, the process runs in ten steps, from a WhatsApp enquiry to remote follow-up; the international patient guide sets out all fourteen. Most plan a short stay in Istanbul, because the treatment itself is a single-visit, local-anaesthetic procedure.
01
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09
10
Step 2 is where most of the useful work happens. You send your name, age, country, preferred dates, relevant medical history and your questions, and that is enough for us to tell you whether to travel at all.
The international patient guide sets out every step and what the package does and does not include, and there is a dedicated guide for patients travelling from the UK. There is no deposit, payment is in cash in EUR, USD or GBP, and the coordination team answers anything else directly (contact details are here).
If you are flying in for this, it is reasonable to want to see where you are going first.
In patients’ words
23 statements about what the enquiry, the day itself and the months afterwards were actually like.
We hold these patient statements on file and publish them with permission. They are shortened for length and identified by first name and country only. This is a private procedure, and the attribution is the part a patient would be recognised by.
None of them quotes a measurement. Girth figures appear on this site only where the study they come from can be named, and a personal account is not that kind of evidence. Read them for what the process is like, not for what it will do.
I sent the same five questions to three clinics. This was the only one that came back with figures and a source instead of promises, and that is ultimately why I got on the plane.
Discretion was what I cared about most. The procedure was never named out loud at the desk, and the lounge is seating in separated pairs instead of a row of men avoiding each other.
The coordinator dealt with the hotel, the transfer and my questions at two in the morning in my own time zone. I never had to explain my situation twice to a different person.
What decided it was being told, without asking, what would be done if I disliked the result — that hyaluronic acid can usually be dissolved again. Nobody else volunteered that.
I asked to see photographs of other patients and was politely refused. Strangely, that is the moment I started trusting the place — my own privacy is worth the same.
Twenty-four hours of flying for a forty-minute procedure sounds absurd. Having read what the surgical alternatives involve, it was the right absurdity.
It is a proper medical floor with a consultation room and a door that closes, not a rented room above a shop. That mattered more to me once I was standing in it.
Confidence in a changing room is a small thing that turns out not to be small at all. The procedure itself was the least dramatic part of the year.
The consultation talked me down from the volume I had asked about. Being told what my anatomy would carry, rather than being sold the largest package, is not what I expected.
Local anaesthetic, about forty minutes, and I walked out and had dinner. The first week of swelling looked alarming until I re-read the aftercare sheet, which had said exactly that.
The doctor is a urologist before he is anything else. He examined me properly and asked about medication and history, and at no point did it feel like an aesthetics shop.
The cash price on the website was the price at the desk. No consultation fee appeared, no deposit was asked for and nothing was added on the day.
My measurement was taken the same way at the consultation and again at follow-up, so the comparison actually means something rather than being a feeling.
Two small lumps appeared in the second month. I messaged, I was seen on video the same week, and they were dealt with without fuss and without an invoice.
A year later it is still visibly there — less than at week two, which is precisely what I was told would happen. Expectations set properly are worth a lot.
The anaesthetic was uncomfortable for about a minute. After that there was pressure and nothing else, and I spent most of it on my phone.
Everything was explained twice — once on WhatsApp before I travelled and again in the room before anything was done. Nothing on the day was a surprise.
I was told at the outset that the first week is not the result and that the contour settles over the following weeks. That turned out to be the single most useful sentence anyone said to me.
In Thursday, treated Friday, home Sunday. What I did not expect was that the follow-up messages kept arriving for weeks after I was back and nobody was selling me anything.
Bruising and tenderness for a few days, back in the gym after a week as instructed, and ten days of abstinence, which was easily the hardest part of the whole thing.
Arabic-speaking coordination from the first message to the last. My questions and my wife’s questions were answered with the same patience.
Nobody promised me permanence. I was given twelve to eighteen months and told to budget for a repeat if I wanted to keep it, which is the honest answer.
I arrived with ten questions written down and left with ten answers, including the two about risks that the other clinics I contacted had quietly skipped.
Individual experiences vary. Nothing described above is a guarantee of outcome, duration or suitability; that is assessed in person, and the risks are set out in full in the risks and safety guide.
Common questions
Penile filler is the injection of hyaluronic acid gel into the loose subcutaneous layer of the penile shaft to increase its circumference. We place it in the dartos layer, between the skin and Buck fascia, under local anaesthesia; the session takes roughly 30 to 45 minutes and the result is temporary, with no surgery involved.
Our clinic reports approximately +4 cm of circumference from 10 cc, +6 cm from 15 cc and +8 cm from 20 cc of hyaluronic acid filler. Those are the clinic’s own figures from its caseload, and they sit above what published trials report. Studies of hyaluronic acid penile girth enhancement most often describe a mean flaccid girth increase of around 2 to 2.5 cm; in one 324-patient audit, individual results ranged from 1.5 cm to 4 cm at a mean volume of 15 mL. Your result depends on baseline circumference, anatomy, filler distribution, treatment volume and physician assessment, and nothing here is guaranteed.
Many patients may retain visible enhancement for approximately 12–18 months, although duration varies considerably between individuals. In a 324-patient audit the mean filler longevity was 12 months, with a range of 9 to 24 months.
Hyaluronic acid is the most widely used and most reversible filler material for penile girth work, and published series report predominantly mild and manageable complications. That does not make it risk-free. Swelling, bruising, nodules, asymmetry, migration and infection are all documented, and rare vascular complications are possible.
No. Penile filler increases circumference only. The gel adds volume outside the erectile bodies and does not alter their structure or suspension, so the erect penis is not lengthened.
Hyaluronic acid filler can usually be broken down with an injection of a dissolving enzyme where this is medically appropriate. This is a real advantage over permanent materials, though not an absolute one: sometimes more than one session is needed.
Pricing depends on the filler volume (10 cc, 15 cc or 20 cc) and is given to you as a written quote by our patient coordination team on request. We accept payment in EUR, USD or GBP, take no deposit, and confirm the final volume at the in-person assessment.
Assoc. Prof. Dr. Zulfu Sertkaya performs the treatment personally. He is a FEBU-certified urologist and andrologist practising in Istanbul, with a subspecialty focus on penile aesthetics, penile implant surgery and men’s health.
Other treatments
Dr. Sertkaya also treats other men’s health concerns. These are described on the clinic’s main website.
Surgical treatment for erectile dysfunction that has not responded to medication, performed by the same urologist.
Assessment and treatment options for acquired curvature of the penis, which a filler does not correct.
A urological work-up of erection problems and the medical and surgical options that follow from it.
Patients sometimes combine a filler visit with an assessment for another concern; tell the coordinator so a single visit can be planned.
Next step
Our patient coordination team handles enquiries and reviews them with Dr. Sertkaya’s team before any recommendation is made. There is no deposit, and asking does not commit you to anything.
WhatsApp +90 530 322 90 26 · Istanbul, Turkey · all contact details