Functional Medicine in Bangkok
A root-cause, doctor-led approach to gut, hormones, metabolism, fatigue, sleep and inflammation — biomarker-guided and personalized by licensed Thai medical doctors.
Root-Cause · Biomarker-Guided · Prescribed by Licensed Thai MDs
Paid consultation with Dr. Petch — by appointment.
Reviewed by Dr. Petch · Functional & Longevity Medicine · Last updated May 2026
5.0 Guest Rating
2,500+ Guests
Physician-Led Care
Biomarker-Guided
Your physician
Dr. Sarassawadee "Petch" Suwanjinda, MD
Chief Medical Strategy Officer · Functional & Longevity Medicine
Every functional medicine plan at Healthi Life is designed by Dr. Petch. She reviews your timeline and goals, orders the biomarker panel that matches your case, and writes a personalized plan integrated with our longevity programs and executive health check-up.
What is functional medicine?
Functional medicine is a root-cause, systems-based approach to health. Rather than treating symptoms in isolation, it looks at how diet, lifestyle, gut health, hormones, stress and environment interact to drive the way you actually feel. At Healthi Life, functional medicine is physician-led and biomarker-guided, integrated with our longevity diagnostics and designed by Dr. Petch alongside our wider clinical team. It complements conventional medicine — it does not replace it — and it pairs naturally with our longevity programs, our executive health check-up, and, where clinically indicated, with hormone replacement therapy and targeted regenerative protocols. The goal is not to chase symptoms — it is to map the upstream drivers and address them in a plan written for your biology.
"Treat the system. Not the symptom."
What functional medicine addresses at Healthi Life
Chronic Fatigue & Low Energy
Persistent tiredness, post-exertional fatigue, slow recovery and low daytime drive that conventional check-ups have not resolved.
Gut & Digestive Issues
Bloating, irregular transit, food sensitivities, IBS-pattern discomfort, post-antibiotic dysbiosis and chronic low-grade gut inflammation.
Hormonal & Metabolic Imbalance
Perimenopausal symptoms, andropause patterns, thyroid and adrenal complaints, weight resistance and metabolic shifts after 35.
Sleep & Stress Dysregulation
Poor sleep architecture, anxious mornings, flattened cortisol curves and burnout signatures in executives and high-performers.
Chronic Inflammation
Persistent low-grade inflammation tied to diet, gut health, environmental load or chronic stress — assessed through targeted biomarkers.
Preventive Optimization
For guests who feel 'mostly well' but want a doctor-led, root-cause framework to extend healthspan and prevent future decline.
Always physician-assessed · Never guaranteed outcomes
Our functional medicine framework
Six components used together — not a menu to pick from, a framework to work through.
Foundation
Comprehensive History & Intake
A long-form physician consultation that maps timeline, symptoms, lifestyle, stressors and family context — the data that 15-minute consults miss.
Format: 60 to 90-minute consult
When: Standard intake step
Diagnostics
Advanced Biomarker Testing
Targeted lab work matched to your case — inflammation, metabolism, micronutrients, lipids, glycemic control and beyond — interpreted in functional ranges, not only lab cut-offs.
Format: Blood draw at the House
When: Re-tested on physician schedule
Systems Health
Gut & Microbiome Assessment
Stool, breath or blood-based testing when clinically indicated to evaluate digestive function, microbial balance, intestinal permeability and food reactivity.
Format: Lab-based testing
When: When clinically indicated
Endocrine
Hormone & Metabolic Panels
Sex hormones, thyroid axis, cortisol pattern, insulin sensitivity, IGF-1 and related markers — a clear map of how the endocrine system is actually performing.
Format: Serum and saliva options
When: Reviewed at every milestone
Therapy
Personalized Nutrition & Lifestyle Plan
A physician-designed plan covering nutrition, movement, sleep, stress and environmental exposures — written for your biology, not a generic protocol sheet.
Format: Personalized document
When: Iterated at follow-up
Therapy
Targeted Supplementation
Where clinically indicated: pharmaceutical-grade supplementation matched to your biomarkers — never a generic shelf stack, always a physician-selected protocol.
Format: Oral / IV as appropriate
When: Reviewed and re-tested
Not sure what you need? Ask Dr. Petch on WhatsApp →
The Healthi Life functional medicine methodology
In-depth consultation, comprehensive testing across our 77-biomarker panel where appropriate, a physician-designed personalized plan, and scheduled re-testing and follow-up.
Root-Cause First
We look upstream — at gut, hormones, nutrition, sleep, stress and environment — instead of treating symptoms in isolation. Plans are designed to address drivers, not to suppress signals.
MD-Designed
Every functional medicine plan is designed by Dr. Petch, our Chief Medical Strategy Officer and a licensed Thai medical doctor with longevity and lifestyle medicine training. No template protocols.
Biomarker-Driven
We use our comprehensive 77-biomarker panel where appropriate, interpreted in functional ranges. Decisions follow data — not generic supplement stacks or wellness trends.
Re-Tested, Not Refilled
Scheduled physician reviews and re-testing confirm whether the plan is working. Plans adapt as your biology responds — never set-and-forget.
Dr. Sarassawadee Suwanjinda (Petch)
Longevity & Functional Medicine Physician · Co-Founder · Chief Medical Strategy Officer
Longevity & Functional Medicine Physician
Training
- MD — Davao Medical School Foundation 2016
- Thai Medical License No. 63464
Credentials
How a functional medicine program works at Healthi Life
- 01
In-Depth Consultation & History
A long-form consultation with Dr. Petch. Timeline, symptoms, lifestyle, family history, stressors and goals — the context that conventional 15-minute consults rarely capture.
- 02
Comprehensive Biomarker & Functional Testing
Targeted lab work matched to your case, drawing on our 77-biomarker panel where appropriate. Additional functional tests (gut, hormone, micronutrient) are ordered only when clinically indicated.
- 03
Physician Interprets Results & Designs a Plan
Dr. Petch reviews results in functional ranges, identifies upstream drivers, and designs a personalized plan covering nutrition, lifestyle, supplementation and clinical referrals as needed.
- 04
Implementation
Guided implementation — nutrition, movement, sleep, stress, targeted therapies. Coordinated with relevant Healthi Life services when integration is the right path.
- 05
Re-Testing & Ongoing Adjustment
Scheduled re-testing and physician follow-up. The plan is refined based on how your biology actually responds — not a generic refill on the calendar.
Personalized · Re-tested · Physician-monitored at every milestone
Safety, scope and Thai medical context
Delivered by licensed Thai physicians
Functional medicine at Healthi Life is delivered by licensed Thai medical doctors, with plans designed by Dr. Petch and coordinated with Dr. First when regenerative or hormone therapies are part of the picture. No part of the program is delivered without a physician relationship.
Complements — does not replace — conventional medicine
Functional medicine is designed to complement conventional medicine, not to replace it. It is not a substitute for emergency care, specialist disease management, or established standard-of-care treatment. Where a specialist referral is the right path, we make it.
Individualized after assessment
Every plan is individualized after physician assessment. We do not publish generic protocols, do not promise specific outcomes, and do not begin therapies without a consultation and the relevant biomarker context. Suitability, scope and duration are set by your physician.
Functional medicine programs — investment
One transparent program. Three phases. Everything physician-led.
01
Initial consultation
By appointment
In-depth physician consult with Dr. Petch. Timeline, symptoms, goals, lifestyle, family context — the long-form intake.
02
Functional medicine program
Indicative · on assessment
Biomarker panel, functional testing where indicated, personalized plan and physician implementation.
03
Re-test & follow-up
Included
Scheduled physician review and re-testing to confirm response and refine the plan on data.
What's included in every program
- Physician consultation with Dr. Petch
- Targeted biomarker panel (case-matched)
- InBody scan (standard inclusion)
- Functional testing where clinically indicated
- Personalized nutrition & lifestyle plan
- Scheduled re-test & physician follow-up
Indicative pricing. Final investment depends on case complexity and testing scope — confirmed after physician consultation.
Frequently asked questions
What is functional medicine?
Functional medicine is a root-cause, systems-based approach to health that looks at how diet, lifestyle, gut health, hormones, stress and environment interact to drive symptoms — rather than treating symptoms in isolation. At Healthi Life, functional medicine is physician-led and biomarker-guided, integrated with our longevity diagnostics and prescribed by licensed Thai medical doctors.
How is functional medicine different from conventional medicine?
Conventional medicine is built around diagnosis and management of established disease — vital, and not something functional medicine replaces. Functional medicine complements it by mapping the upstream drivers that produce symptoms long before disease is diagnosable: gut function, hormonal balance, inflammation, nutrition, sleep, stress and environmental load. At Healthi Life, the two work together, with our physicians referring to specialist care whenever it is the right path.
Who is functional medicine for?
Functional medicine suits guests who are not 'sick enough' for conventional answers but not feeling well — chronic fatigue, gut issues, hormonal shifts, sleep and stress dysregulation, stalled metabolism — as well as guests who feel mostly well and want a physician-led, preventive framework to optimize healthspan. Every plan begins with a consultation; suitability is assessed individually.
What conditions can functional medicine help with at Healthi Life?
Common reasons guests come to us include chronic fatigue, gut and digestive issues, hormonal and metabolic imbalance, sleep and stress dysregulation, chronic low-grade inflammation, and preventive optimization. Functional medicine is not a guaranteed cure for any condition — it is a personalized, physician-led framework that is always assessed and adjusted on an individual basis.
How long does a functional medicine program take?
Program length varies by individual, complexity and goals. A typical first cycle includes the consultation, testing, plan design and at least one scheduled re-test and follow-up over several months. Some guests work with us short-term to address a specific concern; others integrate functional medicine into a longer-term longevity program. Dr. Petch monitors progress at every follow-up.
Can functional medicine be combined with a longevity program or HRT?
Yes — and many guests do exactly this. Functional medicine pairs naturally with our longevity programs, executive health check-ups and, where clinically indicated, hormone replacement therapy or peptide protocols. All combinations are physician-designed by Dr. Petch and coordinated with Dr. First when regenerative or hormone therapies are part of the plan.
Medical disclaimer
The content on this page is provided for educational purposes and does not constitute individual medical advice, diagnosis or treatment. Functional medicine at Healthi Life is delivered by licensed Thai medical doctors and is designed to complement conventional medicine — it is not a substitute for emergency care, specialist disease management, or established standard-of-care treatment. Plans are individualized after physician assessment. Do not begin, modify, or stop any therapy based on website content. Book a consultation to discuss your specific situation.
Ready to address the root cause, not just the symptom?
A paid consultation with Dr. Petch. We review your timeline, goals and biology, and decide together whether functional medicine is the right framework for you. By appointment.
Root-Cause · MD-Designed · Thai-Licensed Physician
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