We are delighted to announce a new addition to our practice: Functional Medicine Consultations. This evidence-based, root-cause approach complements our existing gynaecological services and allows us to offer a more complete picture of women's health — one that addresses not just symptoms, but the underlying factors that drive them.
What is Functional Medicine?
Functional medicine is a patient-centred, science-based approach that focuses on identifying and addressing the root causes of disease. Rather than treating symptoms in isolation, functional medicine looks at the complex web of interactions in a patient's history, physiology, and lifestyle that can lead to illness.
In the context of women's health, this means going beyond a standard consultation to explore:
- Hormonal balance — understanding the full hormonal picture, including thyroid, adrenal, and reproductive hormones and how they interact
- Gut health — the microbiome plays a key role in oestrogen metabolism, immune function, and inflammation
- Nutritional status — identifying deficiencies in iron, vitamin D, B vitamins, magnesium, and other nutrients critical to women's health
- Chronic inflammation — a common driver of conditions such as endometriosis, PCOS, and autoimmune thyroid disease
- Stress and adrenal function — how chronic stress impacts hormonal health, sleep, and energy levels
- Environmental factors — the role of endocrine disruptors, toxin exposure, and lifestyle factors in hormonal imbalance
Who can benefit?
Functional medicine consultations are particularly valuable for women experiencing:
- Persistent fatigue that doesn't improve with rest
- Hormonal imbalances such as irregular periods, PMS, or difficult perimenopause
- Digestive issues including bloating, IBS-type symptoms, and food sensitivities
- Recurrent infections or autoimmune conditions
- Weight changes that seem resistant to conventional approaches
- Brain fog, low mood, or anxiety without a clear cause
- Skin conditions such as acne, eczema, or hair thinning linked to hormonal factors
It is also an excellent option for women who feel they have been told that their blood tests are "normal" but still don't feel well. Functional medicine uses more comprehensive testing and looks at optimal ranges, not just reference ranges.
What a functional medicine consultation actually looks like
A functional medicine consultation is longer and more in-depth than a standard appointment — typically 60 to 90 minutes for the initial visit. In my clinic, the process follows a structured path:
Before we meet, I send detailed questionnaires covering your diet, sleep patterns, stress levels, digestive health, energy, menstrual history, and environmental exposures. I review these thoroughly before the appointment, so our time together is spent on dialogue rather than form-filling.
During the consultation itself, I build a health timeline — a chronological map of your health from early life to the present. This might reveal, for instance, that recurrent thrush began after a course of antibiotics five years ago, that your fatigue coincided with a stressful job change, or that your skin and periods deteriorated after stopping the pill. These connections are often invisible in a standard ten-minute GP appointment.
Based on what we find, I may recommend advanced diagnostic testing. This can include comprehensive hormonal panels (looking at oestrogen metabolites, progesterone, DHEA-S, cortisol, and full thyroid function including antibodies), gut health testing (stool analysis for microbiome composition, markers of inflammation and digestive function), nutrient status (iron studies, vitamin D, B12, folate, magnesium, zinc), and inflammatory markers such as hs-CRP and homocysteine. These tests go beyond what is typically offered in standard NHS blood work, and they often reveal the missing piece of the puzzle.
Finally, I create a personalised treatment plan combining targeted nutrition, evidence-based supplementation, lifestyle modifications, and where appropriate, conventional medical treatments. Follow-up appointments allow us to track progress and adjust the plan.
Conditions where this approach works well
I find functional medicine particularly valuable for certain conditions that tend to respond incompletely to conventional treatment alone:
- PCOS — addressing insulin resistance through dietary changes, optimising vitamin D and inositol, and managing the inflammatory component can significantly improve symptoms alongside standard medical management
- Endometriosis — an anti-inflammatory dietary approach, gut health optimisation, and targeted supplementation (omega-3 fatty acids, NAC, turmeric) can complement hormonal and surgical treatments
- Recurrent infections — chronic thrush or recurrent UTIs often have underlying drivers such as gut dysbiosis, immune dysfunction, or oestrogen deficiency that respond to a root-cause approach
- Chronic fatigue — when standard blood tests come back “normal” but you still feel exhausted, functional testing often identifies subclinical thyroid dysfunction, adrenal imbalance, nutrient deficiencies, or mitochondrial issues
- Gut health issues — bloating, IBS-type symptoms, and food sensitivities are closely linked to hormonal health through the oestrobolome (the gut bacteria that metabolise oestrogen), and treating one often improves the other
How it complements conventional treatment
I want to be clear: functional medicine does not replace conventional gynaecology. It sits alongside it. I would never suggest a woman with a large ovarian cyst forgo surgery in favour of supplements, or that someone with severe endometriosis stop their hormonal treatment. What I offer is an additional layer of care — one that asks why the problem developed and what we can do to create the best possible environment for healing.
A patient starting HRT for menopause, for example, may see better results when we also address vitamin D deficiency, optimise her magnesium levels for sleep, and support her gut health. A woman with PCOS who is already on metformin might benefit from dietary changes that further improve her insulin sensitivity. The two approaches are genuinely complementary, and in my experience, women who engage with both tend to feel significantly better than those using either alone.
Book your Functional Medicine consultation
If you're interested in taking a deeper, root-cause approach to your health, we'd love to hear from you. Functional medicine consultations are available at our London clinics. Book your appointment here or contact us to find out more.
Interested in a holistic, root-cause approach? Dr. Kotur de Castelbajac is now offering functional medicine consultations alongside her gynaecological services.
Book a Functional Medicine ConsultationMedically reviewed by Dr. Victoire Kotur de Castelbajac, Consultant Gynaecologist (GMC-registered) — Last reviewed March 2026
Sources & Further Reading
- Institute for Functional Medicine — The leading global organisation for functional medicine training and clinical practice
- British Society for Ecological Medicine — UK professional body representing practitioners of nutritional and environmental medicine