Step 1. Take your Online Health Assessment
Step 2
Step 2. Receive Free Phone Call To Discuss
Step 3. Schedule Your Functional Medicine Consultation
Step 4
Step 4. Follow Up Result Analysis & Treatment Plan
Step 5
Step 5. Follow Up Support & Optimize
Root Cause Health Solutions
Get To The Root Cause Of What Is Wrong... and then Treat It!
Step 1
Step 1. Take your Online Health Assessment
Step 2
Step 2. Receive Free Phone Call To Discuss
Step 3
Step 3. Schedule Your Functional Medicine Consultation
Step 4
Step 4. Follow Up Result Analysis & Treatment Plan
Step 5
Step 5. Follow Up Support & Optimize
Functional & Integrative Medicine in Los Angeles- With Expertise and Integrity
Entrust your care with a Board-Certified Physician with 25+ Years of Experience
Sophisticated, evidence-based care for complex health conditions, disease prevention, healthy aging and optimal genetic potential
Dr. Rashel Tahzib is a board-certified physician with two decades of experience in functional medicine, specializing in functional, integrative, and anti-aging medicine in Los Angeles. She combines conventional medical expertise with advanced systems biology to uncover root causes, restore balance, and optimize long-term health.
You deserve answers—and a dedicated physician who looks deeper.
–Schedule a Comprehensive Consultation
–Explore Our Personalized Care Programs
Beyond Symptoms, A Root-Cause, Systems Biology Approach to Healing
Treating the Whole Person—Not Isolated Symptoms
Dr. Rashel practices systems biology and upstream medicine, viewing the body as an interconnected whole rather than a collection of unrelated diagnoses.
Instead of a “name it and blame it” pharmaceutical approach, she focuses on identifying why dysfunction occurs, addressing imbalances at their origin.
Using cutting-edge functional diagnostics, patients gain clarity around:
- Hormonal and metabolic dysfunction
- Inflammation and immune imbalance
- Gut and microbiome health
- Nutrient deficiencies and toxic burden
- Optimizing genetic potential and advanced regenerative treatments
This approach allows treatment to be precise, personalized, and effective.
At Advance Health, we look beyond surface-level symptoms. While conventional medicine often manages illness downstream, functional medicine investigates upstream imbalances—the real reasons your body isn’t functioning optimally.
Expertise in Complex, Chronic, and Unexplained Conditions
When Conventional Medicine Has Fallen Short
Dr. Rashel Tahzib specializes in patients with complex or unresolved health concerns, including those who feel unheard, misdiagnosed, or stuck in symptom management.
Her approach is ideal for individuals seeking:
- Deeper answers
- A physician-led functional medicine model
- Thoughtful integration of conventional and holistic care
Every patient receives personalized attention, strategic testing, and a clear plan forward.
Advanced Diagnostics. Personalized Treatment. Lasting Results
Understanding What’s Happening—and Why
Dr. Rashel Tahzib utilizes the latest advancements in functional medicine testing to help patients understand the root drivers of their symptoms—not just the diagnosis.
Each treatment plan is:
- Evidence-based
- Customized to the individual
- Designed to restore physiological balance
- Focused on long-term disease prevention
Patients are educated and empowered to make lasting informed, confident decisions about their health.
Functional Medicine Focused on Longevity and Vitality
Getting You Better—and Keeping You Well
Our goal is simple:
Improve your health now and protect it for the future.
We prioritize:
- Preventive medicine
- Therapies aligned with the body’s natural physiology
- Avoidance of unnecessary drugs and surgeries
- Long-term wellness and resilience
By reducing reliance on medications when appropriate, patients experience fewer side effects and more sustainable outcomes.
Ready to Take Control of Your Health?
If you’re looking for a functional and integrative medicine physician in Los Angeles who combines medical depth with personalized care, Dr. Rashel Tahzib is here to help.
Conditions Treated
Autoimmune Disease Reversal
Rheumatoid arthritis, lupus, multiple sclerosis, Hashimoto’s and Graves thyroid disease, celiac disease, psoriasis, inflammatory bowel disease, and many others.
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Digestive Health Restoration
We treat a variety of digestive problems including: GERD, Esophagitis, Gastritis, H Pylori, SIBO, IBS, Ulcerative Colitis, Crohn’s disease, and many others.
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Thyroid Health Optimization
Symptoms of a low functioning thyroid include: fatigue, constipation, hair loss, brain fog, infertility, weight gain and many others.
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Candida Overgrowth
Candida overgrowth is one of the most common conditions I treat. It’s one of the most underdiagnosed, misdiagnosed, and mistreated conditions conventionally.
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BioIdentical Hormone Replacement Therapy
Regain the zest for life and look and feel great with customized bioidentical hormone replacement therapy.
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Small Intestinal Bacterial Overgrowth (SIBO)
SIBO occurs when excessive bacteria grow in the small intestine, leading to bloating, gas, digestive discomfort, and nutrient deficiencies.
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Chronic Infections / Lyme Disease
Lyme, CMV, Herpes, Epstein Barr cause debilitating symptoms like joint pain, brain fog and neurologic symptoms.
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Chronic Fatigue / Fibromyalgia
Fatigue, muscle/joint pain, brain fog, insomnia, gastrointestinal problems, headaches, flu like symptoms and more.
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Hormone Imbalance / Women’s Health
Symptoms of hormone imbalance include irregular or heavy periods, breast tenderness, insomnia or interrupted sleep, acne, erectile dysfunction, weight gain and more.
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Low Testosterone / Men’s Health
Signs of low testosterone include fatigue, reduced muscle mass, weight gain, low libido, erectile dysfunction, mood changes, brain fog, and more.
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Functional Medical Weight Loss
A personalized, root-cause approach to weight management that focuses on balancing hormones, improving metabolism, and underlying health issues.
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Insulin Resistance / Hyperlipidemia
Insulin resistance reduces the body’s response to insulin, raising blood sugar levels. Hyperlipidemia involves high blood fat levels, increasing the risk of heart disease and metabolic disorders.
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Fertility Optimization
Address underlying factors such as nutrient deficiencies, adrenal health, and stress to enhance fertility and support a healthy pregnancy.
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Conditions Treated
01.
Schedule a Functional Medicine Consultation
Schedule Functional Medicine Consultations with Dr. Rashel available in Colorado and California.
02.
Schedule a Functional Wellness Consultation
Schedule your Functional Wellness Consultation from anywhere today! Available in Colorado and California.
04.
Begin Health Restore Candida Clear Program
Begin to Heal Your Gut and Tackle Candida with Candida Clear Programs
05.
Feel Better Now Health Restore Supplements and Kits
Improve your health now with Dr Rashel’s Health Restore Kits
AFFILIATIONS & ASSOCIATIONS
Latest Testimonials
***** ” Dr. Rashel Tahzib is most knowledgeable doctor who pays attention and cares. That is the most I can expect from a doctor. She helped me with my autoimmune disease that I was suffering for many years and helped my wife with her hormone deficiency . We are so grateful to her.”-Vicky S.M
“Dr. Rashel Tahzib is the most knowledgeable doctor who pays attention and cares. That is the most I can expect from a doctor. She helped me with my autoimmune disease that I was suffering from for many years and helped my wife with her hormone deficiency. We are so grateful to her.”
Vicky S.M.
"Dr Rashel is so wonderful. Best Doctor if you have thyroid or hormone problems. My Wife and I both work with Dr Rashel and she is so caring and spends so much time attention we feel like family."
Robert
Los Angeles
"Dr Rashel helped me and my wife with fertility and helped us have our healthy beautiful baby girl.
My wife had seen many doctors and done cycle after cycle of failed IVF."
Chris
Los Angeles
"Thank you Dr Rashel for everything you have done for me I can never than you enough.
I found Dr Rashel after having gone to more than a dozen doctors and finding myself more and more disappointed ..."
Jila
Los Angeles
About Dr. Rashel
Solving Problems That Are
Beyond Your Control
Dr. Rashel Tahzib is a Functional Medicine specialist, one of the few physicians who are certified to practice Functional Medicine by The Institute for Functional Medicine certified physician list. She is a board-certified Family Medicine Physician with over 20 years of medical clinical experience.
- Family Medicine Physician
- Root Cause Answers
- Functional Medicine Practitioner
- Personalized Treatments
AFFILIATIONS & ASSOCIATIONS
We want you to feel confident in the unique care we provide and ensure it’s the right fit for your health needs.
To get started, please complete the form below with your contact information and answer a few quick questions to determine if we are a good fit for you and your conditions.
Take Your Free Online Health Assessment today and you will have taken the best first step you can to addressing your health problems and getting rid of your symptoms for good. Dr Rashel Tahzib will review your results and we will contact you to discuss next steps.
Dr. Rashel offers a mobile and virtual practice operating in the Greater Los Angeles and Denver area. This allows greater access and flexibility to patients while maintaining the high level of personalized medicine that works with you.
