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Personalised care to support your health and vitality, including bioidentical hormone replacement therapy and Thermocheck® breast thermography.

Established in 1998. Led by Dr Nyjon Eccles.

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Integrative Health & Longevity Clinic, Harley Street, London

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Recharge your mind, body and soul with personalised bioidentical hormone treatment with functional medicine by Dr Nyjon Eccles, BSC, MBBS, MRCP, PHD

Natural Breast Health Clinic

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Our breast health clinic in London offers comprehensive assessment that will help to identify lifestyle or physiological imbalances

Personalised Bioidentical Hormone Treatments

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Meet the Younger You – Personalised Bioidentical Hormone Therapy with Functional Medicine Approach by Dr Nyjon Eccles, BSC, MBBS, MRCP, PHD

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Welcome to The Natural Doctor – one of London’s most experienced longevity medicine practices. For over 27 years, Dr Nyjon Eccles and our specialist clinical team have been doing something that most of medicine still doesn’t: treating the causes of ageing itself, not just its symptoms.

This is precision longevity medicine: a rigorous, evidence-based approach that measures your biological age, maps the systems driving it, and delivers personalised clinical interventions – from bioidentical hormone optimisation and advanced diagnostics to bespoke nutraceutical protocols and longevity programmes – that change the trajectory of how you age.

Whether you are managing active hormonal symptoms, investigating your cardiovascular risk, or investing proactively in the decades ahead – this is the practice that has been building that expertise since 1998.

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Trusted by 10k+ patients

The Natural Doctor is a Harley Street integrative and preventive medicine practice with a singular focus: helping high-achieving adults age with biological authority. We combine the most advanced diagnostics available in UK private medicine with over 27 years of clinical experience in bioidentical hormone therapy, mitochondrial medicine, functional nutrition, and precision preventive care.

Our approach begins with a principle that conventional medicine rarely applies: measure before you treat. Every patient who walks through our door receives a clinical assessment built around their actual biology – not a generic protocol. We measure hormonal status, metabolic health, inflammatory load, mitochondrial function, cardiovascular risk, and biological age directly. Then we act on what we find.

Our practice is led by Dr Nyjon Eccles BSc MBBS MRCP PhD – a pioneering integrated medicine physician, one of the UK’s most experienced longevity doctors, and the clinical innovator behind ThermoCheck® breast thermography, BioGroHair®, D3Plus, and the Precision Longevity Model™. Since 1998, Dr Eccles has been practising what the longevity science community is only now beginning to document.

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Dr. Nyjon Eccles

Dr. Sarah Jenkins

Dr. Vishal Aggarwal

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From our most established clinical services to our newest precision longevity programmes – each one is physician-led, evidence-based, and designed around your individual biology.

Thermocheck® Breast Thermography

Safe, radiation-free, painless breast health screening – the gold standard in early physiological detection, and the most advanced thermography breast scanning available in London. Particularly valuable for women with dense breast tissue. Recommended as a complement to mammography, not a replacement.

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BHRT / Natural Menopause Treatment - Women

Bioidentical hormone replacement therapy (BHRT) for women: a bespoke, science-led approach to perimenopause, menopause, and hormone optimisation as a longevity strategy. Plant-derived, body-identical hormones, individually compounded, comprehensively monitored. The most precisely personalised HRT available.

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BHRT / Recharge Programme - Men

Recharge your energy, drive, and healthspan with our BHRT programme for men – addressing testosterone deficiency, andropause, and DHEA decline through bioidentical, individually compounded hormone therapy. Includes our 70-biomarker Well Man Check.

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Well Woman Check - 68-Biomarker Longevity Assessment

The most comprehensive women’s health and longevity blood assessment available in private medicine. 68 biomarkers covering hormones, functional thyroid testing, metabolic health, cortisol, inflammation, oxidative stress, and nutritional status. With optional EpiAge® epigenetic age testing and ThermoCheck® add-on.

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Well Man Check - 70-Biomarker Longevity Assessment

A comprehensive 70-biomarker health and longevity assessment for men – covering testosterone, DHEA, PSA, full thyroid function, HOMA-IR insulin resistance, cardiovascular risk, and biological ageing markers. The starting point for any serious longevity strategy.

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Precision Longevity Programmes

Our flagship annual clinical partnerships — from the Precision Package (from £950) through the Annual Precision Longevity Programme (from £3,500) to the Elite Programme (from £8,000). Comprehensive biological age assessment, personalised protocols, and ongoing clinical management across the full longevity spectrum.

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“At The Natural Doctor, prevention is at the heart of everything we do. But prevention in 2025 means something far more specific than it once did. We now have the tools to measure biological ageing directly – to see, in your blood and in your cells, how fast your body is actually ageing and what is driving it. We can correct the hormonal imbalances, the mitochondrial decline, the metabolic dysfunction, and the inflammatory burden that accelerate that process. And we can do so with the same rigour and scientific precision that the best conventional medicine applies to disease. That is what Precision Longevity Medicine means to me – and it is what I have been building towards for the past 27 years.”

Dr Nyjon Eccles BSc MBBS MRCP PhD

Founder & Medical Director, The Natural Doctor

MEASURE · INTERPRET · CORRECT · OPTIMISE · MAINTAIN

Most medicine waits for something to go wrong. Precision Longevity Medicine intervenes before it does – using validated biomarkers to measure how fast your biology is ageing, identify the mechanisms driving that pace, and act on what it finds with genuine clinical precision.

The forces driving accelerated ageing – hormonal decline, mitochondrial dysfunction, insulin resistance, chronic inflammation, and epigenetic drift – are measurable years before clinical disease appears. We measure them. We interpret them. And we correct them.

This is the clinical framework that has defined our practice since 1998 – and that the precision longevity research published in the past five years has confirmed is the right approach.

MEASURE

Comprehensive biomarker assessment: biological age, hormonal network, metabolic health, inflammatory load, mitochondrial function, cardiovascular risk, and gut health

INTERPRET

Full physician interpretation by Dr Eccles – through the lens of functional biology and longevity science, not reference range comparison

CORRECT

Targeted interventions: BHRT hormone optimisation, mitochondrial support, metabolic correction, gut restoration, nutritional correction, and bespoke nutraceutical protocols

OPTIMISE

Regular retesting to track your biological age trajectory and refine your protocol as your biology responds

MAINTAIN

Annual programme structure that sustains the gains and adapts as your life and biology evolve

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The science of biological ageing has advanced more in the past ten years than in the previous fifty. The twelve hallmarks of ageing – from mitochondrial dysfunction and epigenetic drift to cellular senescence and chronic inflammation – are now well-characterised, measurable, and in many cases addressable through clinical intervention.

What has not kept pace is clinical practice. Most patients are still assessed against population reference ranges that tell you whether something is abnormal – not whether it is optimal. They are still given hormone levels rather than hormone networks. They are still offered statins rather than endothelial biology assessments. They are still told their TSH/thyroid profile is ‘fine’ on the basis of a single TSH test.

The Harley Street Advantage

The Natural Doctor has been practising differently for a quarter century. We offer advanced blood testing London patients deserve – comprehensive, functional, and interpreted with the depth that 27+ years of clinical experience provides. As a leading longevity clinic London trusts, we are not a wellness centre. We are a precision longevity clinic staffed by physicians – and the difference matters.

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Our diagnostic toolkit goes significantly beyond what any standard NHS or private GP panel provides. At The Natural Doctor, we use the most validated longevity diagnostic tools available:

EpiAge® epigenetic age testing

Your biological age vs chronological age – measured through DNA methylation, the most validated biological age test UK science has to offer

PULS Cardiac Test

A nine-protein algorithm measuring endothelial damage and 5-year ACS risk – identifying the 50% of cardiac patients with normal lipid profiles that standard testing consistently misses

Heart Rate Variability (HRV) testing

Autonomic nervous system resilience, biological stress load, and cardiovascular recovery capacity

ThermoCheck® Breast Thermography

Our proprietary radiation-free breast health screening – developed and refined by Dr Eccles over 27 years of clinical practice

Well Woman and Well Man Checks

68 and 70-biomarker comprehensive panels – the most thorough longevity blood test London private medicine offers

COMING SOON

A more personalised approach to better ageing.

Our new Precision Longevity Programmes combine advanced testing, detailed health assessment and personalised strategies to help you understand your health today – and take a proactive approach to your future.

Over 27 years of clinical practice, Dr Eccles has developed a portfolio of proprietary products that emerged directly from patient outcomes and longevity research – not from marketing. Each one is clinically formulated and available through The Natural Doctor.

D3Plus and D3Plus Extra

Our clinically formulated vitamin D3 + K2 supplement – addressing the most widespread nutritional deficiency in longevity medicine and one of the most impactful single interventions for mitochondrial function, cardiovascular health, and immune resilience.

Bespoke Mitochondrial Support

Supplements developed by one of the world’s leading Mitochondrial Medicine Experts.

BioGroHair®

A clinically designed hair restoration system – oral and topical – developed from the longevity biology of hair follicle stem cell decline. One of the UK’s most comprehensively evidenced nutraceutical hair programmes.

Ripple Longevity Complex™

Our multi-hub longevity nutraceutical formula: eleven evidence-selected ingredients addressing AMPK, mitochondrial biogenesis, NLRP3 inflammation, and epigenetic regulation simultaneously.

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About Dr Nyjon Eccles

Listen to a podcast with Dr Nyjon Eccles, BSC, MBBS, MRCP, PHD, discussing his journey, qualifications and how his revolutionary treatments are helping his patients.

Dr Eccles Talks About Breast Health

Listen to a podcast with Dr Nyjon Eccles, BSC, MBBS, MRCP, PHD, sharing his expertise on breast health and the various options to achieve optimal breast health.

Dr Eccles And His Inventions in Hair Loss

Listen to a podcast with Dr Nyjon Eccles, BSC, MBBS, MRCP, PHD, sharing his expertise on hair loss and top tips for hair loss.

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The most important decision in longevity medicine is not which programme to choose – it is the decision to measure your biology and act on what you find. The Natural Doctor has been helping patients make that decision for over 25 years.

8 Upper Wimpole St, Marylebone, London W1G 6LH
020 7224 4622
info@thenaturaldoctor.org
Monday to Friday 9.30 am – 5 pm

Remote consultations available across Europe · Marbella longevity retreats by appointment

Google Rating

4.8

The Natural Doctor - Breast Health & BHRT Clinic London

4.8

Alice Cutler

16:12 25 Sep 26

Had another great Breast scan at The Natural Doctor. This is my 4th time at the practice and Susie, the clinician, was as lovely and friendly as the previous staff who have performed the scan for me. They all make you feel very at ease and talk you through any concerns you may have. I can't recommend the team and The Natural Doctor practice itself, highly enough.

sally123lilac

09:10 15 Sep 26

I attended the Clinic yesterday for a thermography breast scan.I was greeting by a very courteous receptionist who led me to the waiting room.The scan was carried out by an extremely personable, professional, warm and friendly young woman, who explained the process to me.The scan was carried out quickly (faster than my previous clinic) with up to date scanning equipment.I was then offered a coffee to take away after the scan.Definitely 5 stars. I would use this Clinic again and would highly recommend the Clinic to friends and family.

35 Lukins

13:12 12 Sep 26

Excellent service and made to feelvery comfortable.

Tracey Edwards - Red Ox

14:33 08 Sep 26

Great communication, well presented clinic, great location.Appointments conducted in a sensitive and appropriate manner, by friendly professional staff putting me at ease.Complimentary tea or coffee to take away, nice touch after a caffeine free morning!

Kathryn Scorza

10:03 08 Sep 26

The Natural Doctor offers very efficient, courteous service, with discretion and consideration for patients and an emphasis on preventing disease developing. My regular thermographic breast scans provide peace of mind, backed up with expert analysis and long experience. Treatments are based on well-researched natural supplements and other products and prescriptions, underpinned by allopathic medical qualifications.

Joanne Kehoe

16:02 05 Sep 26

This will be my 4th Thermogram check with The Natural Doctor and each time I'm made to feel welcome by the staff . This time I've also had a well woman blood test with a later consultation with Dr. Eccles.I trust Dr Eccles with my health so much so I've also taken my daughter for a blood test and consultation and he was absolutely amazing.He has explained more in a 45min consultation than the NHS have over a 2 year period.Excellent team keep up the good work.

Lynn Hannay

16:39 17 Aug 26

very professional and supportive. I was immediately made me feel at ease and cared for .

Annie FIELD

16:14 14 Aug 26

Very efficient and slick procedure. I would certainly recommend the Natural Doctor

Donna Burgoyne

10:47 17 Apr 26

"This was my 4th time at the clinic for my annual thermogram. The atmosphere is very calming. I was met by Nazret who immediately put me at ease and explained the procedure..Once again the whole process was conducted very professionally and all questions I asked were either answered either immediately or also emailed later to me.I highly recommend an appointment for piece of mind."

Zion4

14:57 09 Apr 26

Having attended The Natural Doctor's Clinic on 3 occasions over the past few years for Breast Thermography Screening, followed by consultations with Dr Eccles, I wholeheartedly recommend this great service for women.If, like myself, you prefer to use an alternative to Mammography for breast screening, Thermography is a great, non-invasive, pain-free method of identifying early on any areas of potential concern. My experiences with the Clinic have all been very positive. The pre and post-appointment communication is very thorough and helpful. The clinicians that carry out the screening have been personable, kind, attentive women, who put you at ease during the procedure. And with Dr Eccles you are in safe hands; he is approachable, amicable whilst highly professional; he clearly cares about his patients and getting the best outcomes for you, using natural therapies and supplementation, and I thoroughly endorse his Thermography service.

Maureen Mcgachan

12:20 26 Feb 26

I had my first thermocheck with Nazret on the 18th Feb 2026.I was made very welcome at the clinic , Nazret was very patient with me as I was a bit nervous and unorganized! She was professional, helpful and knowledgeable.

Tracey Edwards - Red Ox

16:10 17 Jan 26

Excellent communication, professional and polite staff, well presented clinic, great location.Appointments conducted in a sensitive and appropriate manner, putting me at ease.Very well looked after and all enquiries dealt with swiftly and efficiently.Highly recommend!

Lynn Hannay

17:31 21 Nov 25

very professional and supportive. Michelle immediately made me feel at ease .

Julie Berry

17:01 17 Nov 25

Just been for my annual breast thermography at the Natural Doctor. Always a delight - the technicians that do the scans are all lovely and you know you are in safe hands. Such. a good way to take care of your breast health - non-invasive and picks up any problems in plenty of time to put things right before they get serious. Highly recommended.

Claire

18:14 14 Nov 25

Honestly it feels strange to say this, but it was such a lovely experience from beginning to end!I was looked after my the lovely and incredibly tentative Nazaret (apologies if I have spelt this incorrect) after experiencing breast appointments elsewhere which have left me wary, it’s safe to say that today restored my confidence and I took great comfort knowing this service is so well thought out and accessible to all 💫⭐️✨🌟Thank youClaire 😊

Sian Bristow

22:17 24 Oct 25

Very relaxed and comfortable atmosphere which puts you at ease. Staff are are very helpful and if unable to answer any questions they will find out and email the answer.

Caroline Collier

15:34 29 Sep 25

Very professional and would thoroughly recommend. Katia explained the process really clearly.

Marina Helenius-Beal

11:15 26 Sep 25

Thank you so much to Katia at The Natural Doctor for her outstanding service during my thermo scan. I couldn’t have been treated any better, she was professional, kind, and made the whole experience so comfortable. I would highly recommend Dr. Eccles and The Natural Doctor team to anyone looking for expert, compassionate care.

Fiona Whitby

19:30 11 Sep 25

I attended the clinic today to have a thermogram breast scan.I was welcomed by reception. I arrived ahead of my scheduled appointment and was happy to be seen earlier than expected.The technician was lovely and made me feel at ease throughout the procedure

Sonia Brown

11:38 11 Aug 25

Thank you so much for offering so much education and insight as part of the process. The scanning technician was so so so lovely. Every step of the process was fully explained. Looking forward to getting the report and using this as part of a proactive way of looking after my health.

Mayellen Phelan

06:47 09 Aug 25

I booked in to have my repeat follow up breast thermography scan, as always I was met by a lovely female scan technician who immediately put me at ease and answered any questions I had thoroughly and sensitively. I thoroughly recommend Dr Eccles and his team for anyone wanting to have a painless, safe and accurate alternative to a mammogram.

Tatina Semprini

00:49 18 Apr 25

I've been having these thermal breast scans (breast thermography) since 2008. It's a quick and easy treatment as well as comfortable and non-invasive, and it gives me peace of mind knowing it's safe and has no bad side effects like radiation. I also like to be proactive and know what's happening in my body on a regular basis so I can deal with it promptly if necessary. The staff has always been very friendly and helpful, so the whole experience is a pleasant one.

Nicola Barnes

20:15 29 Nov 24

The scan technician was really friendly and put me at ease. She was very knowledgeable about thermography and about the other treatments on offer at the Natural Doctor. I would definitely recommend the treatment.

Julia S

14:08 27 Nov 24

Great quality vitamins that are always delivered in a timely fashion! The staff at The Natural Doctor are always very friendly and helpful.

Joanne Kehoe

11:07 28 Oct 24

After suffering Breast Cancer 6 years ago I knew I had to be in charge of my own breast health .So after searching I found Dr . Eccles and he's changed my whole life approach to breast health .I now feel reassured and can get on with my life knowing I'm doing everything I can to stay healthy .I highly recommend Dr.Eccles and his team . They make you feel really comfortable throughout.

Sonia Rossi

22:12 22 Apr 24

Absolutely great service, been going for a number of years now, for the thermographic breast imaging. Staff is very professional and very kind and observant at the same time. Results come through within a couple of days.Would continue to use this service as an alternative to mammogram, for as long as the clinic is there.

Catherine Hancox

11:31 16 Mar 24

I have found all the staff to be helpful and understanding.A pleasure to deal with.My consultation with Dr Eccles was not only informative medically speaking, but he also tried so hard to find a solution to my problems. At the end of the consultation, I felt much calmer. I really felt as if he were 'routing' for me. I am most grateful.

Julie Berry

15:44 06 Oct 23

Always a delight to pay a visit to the Natural Doctor. He's currently the only doctor I trust. Genuinely concerned with people's health. I've been having regular thermal scans for years, having been pegged as 'at risk' for breast cancer. All the ladies that do the scans are lovely and you know you are in safe hands with his advice on how to put things right if they look a bit dodgy - the scans pick up any problems way in advance of anything serious. A no-brainer for me.

Muxloe Property

19:48 17 Jun 22

The Dr helped me feel like myself again after lots of low level symptoms. My GP dismissed me. It was worth every penny. Thank you

Janie Wolf

09:06 31 May 22

Dr Eccles has given me my life back, because he has balanced my hormones in a way that enables me to live my life to the full again!I was not only suffering with menopause fatigue and the many other symptoms of menopause, but I had ongoing lethargy with Auto-Immune Hashimotos and a struggling thyroid. It came to the point I didn’t know which symptom was due to which hormone deficiency.After my second thorough consultation with Dr Eccles, he had tweaked my dose and found I was indeed Iodine deficient. Now I am beginning to have normal levels of energy again and it is getting better and better, for the first time in five years! I sleep like a baby and my overactive bladder has been calmed. I am so glad I found Dr Eccles, life is too short to suffer with debilitating symptoms, he is the best doctor for me!

Nicky Emlick

21:19 23 Feb 22

Highly recommend this practice. My experience so far after taking the thermogenic breast scan, and Bio identical hormone replacements has been a very pleasant and informative process.

Crazy T

10:06 27 Oct 21

I started seeing Dr Eccles almost 3 years ago for fertility issue , after struggling for 9 years and 2 miscarriages 2 years a part .I had done blood test with them and was on natural hormonal medication for almost 2 years ,and it worked for me and i fell pregnant and i have a 5 month old son now .I am still seeing him for general health and hopefully working towards second pregnancy.He is amazing , listens to every concern and answer all queries very nicely and in friendly manner and girls at receptions are also great and quick at responding to any questions or concerns i might have.

Kelly Hafner

15:58 09 Sep 21

I began to see Dr Eccles six years ago and he continues to provide excellent care and attention every time I see him. I have referred several friends to him and they have all been very happy. Both Dr Eccles and his staff genuinely care and always go the extra mile. I highly recommend him for all areas of female health, immunity and healthy ageing in general!

Victoria Harris

09:54 12 Aug 20

A very friendly but professional service. Experts in their field that go over and above to ensure you have the best service and experience.Highly recommend.

Alison Kittle

14:33 14 Aug 19

Been visiting this clinic for nearly 10 years. It reassures me about my breast health and if I raise any concerns they are always answered well. Staff are professional but friendly. Dr Eccles knows his field. Will keep returning for my check ups. Peace of mind is worth so much.

maria

13:27 16 Jul 19

For several years I have been seeing Dc Eccles for general l wellbeing. After I started seeing him, I felt much better. Excellent Doctor with very good supplements and product. I highly recommend Dr Eccles and his prescription.

Anwen Pragnell

14:50 20 Jun 19

A recent breast health scare in my 30's lead me to seek a less invasive option to check breast health. The Thermocheck scan, detailed report and Skype consultation with Dr Eccles was very professional and reassuring. I now feel more informed and supported in preparation for my hospital appointment. I highly recommend Dr Eccles and his team to provide an efficient, professional service and support your health naturally.

Arthur Moore

09:27 16 Jan 18

Thank you for giving me the opportunity to use your excellent product. Although it has only been 2 weeks, both myself and my wife have noticed, the hair growth has certainly become thicker, more of a covering. This is very encouraging, following many years of not really being bothered about my hair loss, now that I am noticing an improvement I am very excited at the prospects of once again having a full head of hair.

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Feel Better Today.Age Well Tomorrow.

Integrative Health & Longevity Clinic, Harley Street, London

Empower Your Health: Breast Cancer Awareness Month

NEW! Express Thermocheck® Breast Thermography Scan

Recharge Programs For Men

Natural Breast Health Clinic

Personalised Bioidentical Hormone Treatments

Real Stories, Real Results

AS FEATURED IN

Personalised Longevity Medicine You Can Trust

Meet the Doctors

BSC, MBBS, MRCP, PhD, Founder & Director

MBBCh, FRSM, ESAG, BCAM - Women’s Health, BHRT & Intimate Wellness Expert

MD MSc, Consultant Physician & Pharmaceutical Innovation Specialist

Popular Treatments

Thermocheck® Breast Thermography

BHRT / Natural Menopause Treatment - Women

BHRT / Recharge Programme - Men

Well Woman Check - 68-Biomarker Longevity Assessment

Well Man Check - 70-Biomarker Longevity Assessment

Precision Longevity Programmes

Dr Nyjon Eccles BSc MBBS MRCP PhD

The Precision Longevity Model™

MEASURE

INTERPRET

CORRECT

OPTIMISE

MAINTAIN

Why Precision Longevity Medicine – and Why Now?

Advanced Diagnostics – Seeing What Standard Medicine Cannot

EpiAge® epigenetic age testing

PULS Cardiac Test

Heart Rate Variability (HRV) testing

ThermoCheck® Breast Thermography

Well Woman and Well Man Checks

Precision Longevity Programmes

Proprietary Longevity Products

D3Plus and D3Plus Extra

Bespoke Mitochondrial Support

BioGroHair®

Ripple Longevity Complex™

Listen to Dr. Eccles Latest Podcasts

“Prevention is our mantra”

Latest News from The Natural Doctor ®

Your Hormones Are Not a Mood Problem

Perimenopause: What to Expect

Are Hormones to Blame? How Hormones Influence Energy, Mood and Metabolism

Begin Your Precision Longevity Journey

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Age Well Tomorrow.

Empower Your Health:
Breast Cancer Awareness Month