Specialist-led longevity medicine, delivered to your home in Marbella
Concierge doctor visits across the Costa del Sol
Hormone optimization, peptide protocols and metabolic medicine
Measurable results and continuous care

Your hormones, your health,
mastered. Quietly.

Gain Muscle. Lose Fat. Find Hidden Risk Early.

Board-certified, specialist-led care.

Hormone optimization. Medically supervised weight management. Longevity care.

By secure video, concierge home visit, or at a private partner clinic on Avenida Ricardo Soriano, Marbella.

Private, specialist-led hormone optimization and medically supervised weight management, built to protect your muscle and your long-term health. By secure video, at your home, or at a private partner clinic in Marbella.

Specialist-Led Care: My Full Training, Credentials and How I Work

A hormone specialist, not a generalist with an interest in hormones.

Endocrinology is the medical specialty of hormones, and hormone treatment is also cardiovascular medicine: blood pressure, blood counts, lipids and long-term risk, the daily work of internal medicine. On the Costa del Sol most hormone care comes from general practitioners, from specialists in other fields, or from hospital departments with waiting lists. Here it is one physician, double board certified in Internal Medicine and Endocrinology, personally and without the waiting list.

That practice has ranged from CEOs in their fifties, sixties and seventies on carefully monitored TRT to elite athletes needing natural optimization of their own physiology. What you are buying is easy, prolonged access to a highly trained, seasoned specialist. The difference, explained.

I Clinical Services

Our Clinical Pillars

Every program is designed by a single endocrinology specialist, integrated into a 12-month protocol, and delivered at home or on a private video call. Clinic visits are also available, at a private partner clinic on Avenida Ricardo Soriano, Marbella, for patients who prefer a clinical setting. Hormone and weight loss medicines are run as monitored programs, not renewal prescriptions.

I The Flagship Assessment

Body Composition Assessment

For Men & Women

Muscle mass, visceral fat and thyroid, measured in one session with medical-grade InBody 380 bioimpedance and point-of-care ultrasound, performed and read by the specialist himself. You leave with a written report and numbers you can act on.

What the assessment changes

A scale gives you one number and no explanation. This assessment tells you what you are actually made of: how much muscle you carry, where the fat sits, and what your thyroid is doing, before any treatment decision is made. It is the baseline every serious protocol is built on, and the reassessment months later is where progress stops being an impression and becomes a number. A DXA scan can always be ordered in addition to complete the picture.

II Most Requested

Hormone Optimization: HRT & TRT

For Men & Women

Hormone care for women and men, taken equally seriously. For peri- and post-menopausal women: estradiol, progesterone and, where indicated, testosterone, chosen by route and dose to fit your risk profile, never a standard packet. For men: testosterone replacement with rigorous monitoring of estradiol, hematocrit, PSA, and cardiovascular markers.

What hormone optimization feels like

The point is simple: to help you feel like yourself again, more energy, a clearer head, steadier mood, and strength you can rebuild. We do it properly and safely, watching your bloodwork closely the whole way, because good hormone care is as much about what we monitor as what we prescribe. For women, it is about moving through menopause on your own terms instead of being ruled by it. Nothing here is a one-size dose; it is your levels, your symptoms and your life, adjusted over time. It also covers continuing or starting hormonal treatment while you are visiting the coast, HRT, thyroid, contraception used for medical reasons, and testosterone where indicated.

III

Medical Weight Loss & Body Composition

Lose Fat. Keep Muscle. Stay Strong.

Semaglutide, tirzepatide and dual-agonist protocols personalized to each patient's metabolic data, body composition, and hormonal profile. Body composition tracking and nutrition coaching layered with a sessional nutritionist partner. One of the fastest-growing areas in European private medicine, delivered by a specialist with the clinical depth to do it properly.

How the weight comes off, and stays off

These medicines genuinely work, but the result depends entirely on how they are used. We start from your real metabolic and hormonal data, dose carefully, and protect your muscle while the fat comes off, so you end up lean and strong rather than just lighter and tired. Just as important is what happens when you stop, and we plan for that from day one so the weight stays gone. This is medical weight loss run by a specialist who tailors the dose, protects your muscle, and plans from day one for the day you stop.

IV

Male Fertility & Hormonal Recovery

Fertility. Recovery. Starting Your Family.

Personalized fertility and hormonal recovery protocols for men seeking to restore reproductive health, optimize sperm parameters, and support natural hormone production. Every protocol begins with comprehensive hormonal, metabolic, and fertility testing, allowing treatment to be tailored to each individual's biology, goals, and timeline. Evidence-based strategies may include lifestyle optimization, targeted supplementation, and specialist-prescribed therapies where clinically appropriate.

How we handle fertility

This is a sensitive area, and it is treated with the seriousness it deserves. We start with a clear picture of your hormones and fertility, then build a plan around your body and your timeline, whether that means protecting your fertility while on testosterone or recovering it after coming off. It is quiet, unhurried, judgment-free care, and every step is explained so you always know where you stand. We stay honest about what is and is not possible, no promises, just proper medicine and a clear plan.

V

Longevity & Performance Counseling

Education-Led. Evidence-Informed. Specialist-Guided.

Specialist counseling and education on anti-aging, focused on peptide therapy and NAD+ protocols, alongside the nutrition, training, and lifestyle that support them. We teach you what these protocols are, how they work, and how they're used. Education and counseling only. We do not sell or supply peptides, NAD+, supplements, or any products.

What this actually covers

This is guidance, not a sales pitch. There is a lot of noise around peptides, NAD+ and anti-aging, and much of it is marketing. Our job is to cut through it with honest, specialist-led answers on what these protocols are, how they really work, what the evidence does and does not show, and where the genuine risks sit, alongside the training, nutrition and sleep that do most of the work. We do not sell or supply any products; we simply help you make safe, informed decisions.

VII Foundation

Advanced Diagnostics & Lab Analysis

Hormones. Heart. Thyroid. Caught Early.

Comprehensive hormonal, metabolic and cardiovascular workups through vetted reference labs. Every protocol begins with data, not guesswork.

What we test, and why it matters

Everything starts here, because you cannot fix what you have not measured. We run a genuinely thorough workup across your hormones, metabolism and cardiovascular health through vetted labs, and then a specialist actually reads it, in context and against how you feel, rather than waving through a few numbers as normal. That interpretation is where the value lives, and it is what turns a page of results into a real plan. It is the honest starting point for everything else we do.

VIII Concierge

Private Prescriptions & Continuity of Care

For Expats on the Costa del Sol & Across Spain

Discreet, specialist-led prescriptions for expats and visitors who need to start or continue treatment on the Costa del Sol, or anywhere in Spain by video. Run out of a medication, left a prescription at home, or need a hormonal or metabolic issue handled properly while you are here? It is reviewed and issued by a double board-certified specialist, in English or Dutch, by video, at your residence, or in clinic. It starts with a short consultation, so every prescription rests on a specialist's judgment.

How the concierge prescription works

This is the opposite of a faceless online prescription form. You speak with an actual specialist, double board-certified in Internal Medicine and Endocrinology, who reviews your history and your reason for the medication before anything is issued. It exists for the situations that come up on a trip: you have run out of your regular medication, your hormone or thyroid treatment needs continuing, or something has come up that you would rather handle privately and quickly than sit in a public clinic for. Everything is done discreetly, in English or Dutch, by video, at your hotel or villa, or in clinic, and often the same day. Every prescription follows a proper consultation and the physician's clinical judgment, the same standard our long-term patients receive. For anything urgent or an emergency, always go straight to a hospital or call 112.

IX Independent

Surgical Coordination & Second Opinions

The Right Surgeon. The Right Procedure. One Guide.

Facing surgery in a health system you do not fully know is one of the biggest decisions you will ever make. We help you choose the right surgeon for your specific procedure on first-hand clinical insight, not marketing, and stay alongside you from the first question through your recovery. Independent by design: we do not operate, and no surgeon pays us to be recommended.

How we guide a surgical decision

It starts with a private intake where we go through your diagnosis, your records and your questions. If the real question is whether anyone should operate at all, we give you an honest, independent second opinion first. When surgery is the right path, we identify the surgeon whose hands genuinely fit your specific procedure, arrange the consultations, translate the options and trade-offs into plain language, and stay involved through the admission and your recovery. One physician, in English or Dutch, standing between you and a high-stakes decision in an unfamiliar system.

For women: menopause care here is its own discipline, not a footnote to men's medicine. The HRT & Menopause page is where to start, or take the one-minute menopause check.

II The Practice

Specialized Medicine. One Standard.
No Compromises.

A specialist-led longevity and hormone consultancy built around a doctor double board-certified in Internal Medicine and Endocrinology, with established experience in testosterone replacement, hormone replacement therapy, metabolic medicine, and counseling on peptide science. Care is prescribed and monitored by the specialist personally, never delegated and never sold off a shelf.

You are seen the way you prefer: by secure video, the comfort backbone of the experience, by concierge home visit, the premium differentiator where the doctor comes to you, or in clinic at a private partner clinic on Avenida Ricardo Soriano, Marbella, on request. One specialist, one standard, across every channel.

Serving the affluent international resident population of Marbella and the wider Costa del Sol who are performance- and longevity-focused and expect a standard of care that matches their lifestyle.

The training behind the care
Internal MedicineBoard certified in Spain
Endocrinology and NutritionBoard certified in Spain
Nine years of hospital trainingAfter the national MIR examination
Master's degree, Universidad de MálagaMorphofunctional assessment, 60 ECTS and a thesis
Andrology, ASESANational course, 2025 and 2026
Bedside ultrasoundExpert course, performed and read in the room
See every qualification in full

"The patient is at the center of the model. I go to the patient, not the other way around."

EN / NL
English & Dutch at Every Patient Touchpoint
100%
Endocrinologist-Led Protocols, No Delegation
Concierge
Home Visits Across the Costa del Sol
Clinic
Sessional visits at a private partner clinic, available on request

“Best Endocrinologist for weight loss and improved body composition.”

Lianne Nicole Muller, Google review

“Best sports endocrinologist in town”

Joel Amador, Google review

“I started working with this endocrinologist to help with weight loss, and the results have gone far beyond the scale. The weight I’ve lost has significantly improved my kidney function, which has been a huge relief. What stood out most was how available he was always ready to answer questions and explain the plan clearly. That level of support gave me real confidence and a lot of peace of mind throughout the process.”

Christopher Abraham, Google review

“Heel profesionele doctor!!!”

David Martinez, Google review
Read All 21 Reviews on Google

Unedited, exactly as written by the reviewer. A selection is shown here; every review, including those in other languages, is on the Google profile.

The Arithmetic of Waiting

Decline is quiet. The bill is not.

From the middle of life onward, muscle, bone, recovery and the hormones that govern them drift a few percent a year. Nothing announces it. It reads as a busy season, a slower week in the gym, a shorter temper. By the time it is loud enough to interrupt you, the easiest decade to act in has already been spent.

Left to drift

Managed by nobody

A ten minute appointment. One number, read against a population average, and the word normal doing the work of a diagnosis. The years pass either way. What is straightforward at fifty is expensive at sixty, and bought back at seventy only in part.

Placed in the right hands

Managed properly

The same years, read by a specialist who measures what actually matters and reads it against you, not an average. Strength that holds. Sleep that restores. A body that keeps pace with the life you built. Not a promise of youth, the compounding return of starting early and doing it properly.

Knowledge, guidance, experience, and a network of the finest specialists in Spain.
Independent. No investors. Answering to no one. First, do no harm.

What is silently accumulating is measurable.

The Body Composition Assessment Muscle quantity, muscle quality, visceral fat and thyroid, measured in one visit with ultrasound and segmental bioimpedance.

Request a Consultation

The evaluation is unhurried. The conversation is private. The earlier it happens, the more there is to work with.

V Book a Consultation

Request a Consultation

5.0 on Google from 21 reviews on the verified profile I manage. Unedited, and you can read every one of them there.

A private consultation with the specialist, by secure video or at your residence across the Costa del Sol. Tell me what you need and how to reach you. I reply personally, usually the same day.

Your Details

Your information is handled with absolute discretion and never shared with third parties. Consultations available in English and Dutch.

VI Get in Touch

Contact the Practice

Consultations available in English and Dutch, by secure video or at your residence across the Costa del Sol.

Email
contact@longevity-marbella.com
WhatsApp
The fastest route. I reply personally, usually the same day.
Coverage Area
Fuengirola, Marbella, Estepona, Puerto Banús
In-clinic appointments are also available at a private partner clinic on Avenida Ricardo Soriano, Marbella, upon request.
Languages
English & Dutch
Native level, consultations in both
Dr de Windt, MD

Dr de Windt, MD

Double board certified in Spain • Internal Medicine and Endocrinology • Full authority to diagnose and prescribe • Número de colegiado 292911860

Your care is directed and monitored by me personally.