You’ve seen every specialist.
Your labs look “normal.”
You still feel awful.
Helping chronic illness sufferers worldwide who’ve tried everything uncover the underlying factors
that keep symptoms thriving — and finally get their lives back
3000+
People Supported
25+
Countries Served
11+
Years Experience
Welcome to Tsintavis Functional Medicine
Panagiotis Tsintavis is the only Registered Dietitian (RD) in Greece who also holds the Functional Medicine Certified Professional (FMCP) credential from the Institute for Functional Medicine. He is best known for functional lab analysis — finding the patterns and connections in results that have been called ‘normal’ for years. Dr. Varvara Zisimidou is an Internal Medicine specialist trained in Germany, with an additional qualification in Naturopathy from the Medical Association of North Rhine, and clinical training at the Department of Naturopathy and Integrative Medicine at Kliniken Essen-Mitte. Together, we bring two disciplines, two clinical perspectives while each continues to practice independently within our own professional scope.
Our approach is to look at the full biochemical picture — how different systems interact and influence one another. We work with people who have complex chronic conditions: those who have seen specialist after specialist, done the tests, followed the protocols, and still don’t have answers. Symptoms don’t grow in isolation. Neither does healing.
From Athens, Greece, we work with patients worldwide through online consultations. If you’ve been dealing with a complex chronic condition and are looking for a different way to understand the full picture, we’re here to help.
Conditions Functional Medicine Can Help With
Specializing in chronic illness that hasn’t improved despite your best efforts
The gut is often where chronic illness begins — and where healing starts.
- Bloating & Gas
- IBS (Irritable Bowel Syndrome)
- IBD (Crohn’s & Ulcerative Colitis)
- GERD & Acid Reflux
- SIBO / IMO / H2S Overgrowth / SIFO
- Food Intolerances & Sensitivities
- Chronic Sinusitis
- Helicobacter Pylori
Hormonal imbalances affect every system — we look at the full picture.
- Thyroid Disorders
- Adrenal Dysfunction
- Female Health (PCOS, PMS, Menopause, Infertility)
- Low Testosterone
- Metabolic Syndrome
- Pre-Diabetes & Insulin Resistance
- Type 2 Diabetes
- Obesity & Weight Resistance
- Burnout
- Osteoporosis
When the immune system turns on itself, systemic investigation is essential.
- Autoimmune Diseases
- Hashimoto’s Thyroiditis
- Multiple Sclerosis
- Rheumatoid Arthritis
- Eczema & Psoriasis
- Asthma
- Environmental & Food Allergies
- Chronic Inflammation
Brain symptoms often have biochemical and metabolic origins that go unaddressed.
- Depression & Anxiety
- Brain Fog & Cognitive Decline
- Chronic Fatigue Syndrome
- Migraines & Headaches
- Sleep Disorders & Insomnia
- Fibromyalgia
- Restless Leg Syndrome
- ADD & ADHD
- Autism Spectrum Disorder
- Parkinson’s Disease
- Alzheimer’s & Dementia
Supporting cardiovascular health and healthy aging through a systems-based approach.
- Cardiovascular Disease & Heart Health
- Elevated Cholesterol
- Healthy Aging
Skin conditions and toxic burden are often expressions of deeper systemic imbalance.
- Acne
- Hair Loss
- Environmental Toxicity
- Detoxification & Heavy Metals
If you don’t see your specific condition listed, book a Health Strategy Call. Our systemic functional medicine approach addresses the root imbalances
that create symptoms, regardless of the diagnostic label.
Success Stories from Around the World
Ready to finally get answers?
If you’ve been through the system, done the tests, and still don’t have a clear picture of what’s driving your symptoms — let’s talk. A 15-minute Health Strategy Call is the first step to understanding whether our functional medicine approach is right for you.
