Gut & Digestive Health
IBS, IBD, acid reflux, SIBO, leaky gut, constipation, diarrhea, food intolerances, bloating, gas
Meet the providers leading your care
Why Parsley clinicians are different
Board-certified clinicians, rigorously trained in functional medicine.
Board-certified clinicians
All Parsley clinicians are MDs, DOs, NPs, or PAs trained at top hospitals and universities in fields like internal medicine and family medicine.
Functional medicine fellowship
Each clinician completes Parsley’s intensive, evidence-based fellowship, plus advanced coursework through the Institute for Functional Medicine.
Conventional + functional care
We combine whole-body functional medicine with the ability to prescribe conventional medications when appropriate, no tradeoffs required.
Evidence-based clinical protocols
Parsley maintains the only complete, documented set of evidence-based functional medicine protocols, continuously reviewed and refined across the practice.
The Parsley clinical collective
Your care is supported by a national team of senior clinicians, shared case review, and AI-enabled tools that surface insights across the practice.
Outcomes tracking
We track progress across the entire practice so care improves not just for one patient, but for everyone we serve. Backed by peer-reviewed studies.
Your integrated care team
Your care is delivered by a coordinated team working together to support you clinically and day to day.
Not just good doctors.
The right ones for you.
Parsley providers are board-certified in conventional medicine and specially trained in functional medicine.
We offer clinical rigor and root-cause depth — without compromise.
Board-certified from top institutions
Practiced in conventional medicine
Advanced training in functional medicine
Evolve protocols with emerging science
Prescribe medications as appropriate
Progress tracking via clinically validated Parsley Symptom Index (PSI)
Dr. Robin Berzin, MD
Founder & CEO of Parsley Health
Not just good doctors.
The right ones for you.
Parsley providers are board-certified in conventional medicine and specially trained in functional medicine.
We offer clinical rigor and root-cause depth — without compromise.
Board-certified from top institutions
Practiced in conventional medicine
Advanced training in functional medicine
Evolve protocols with emerging science
Prescribe medications as appropriate
Progress tracking via clinically validated Parsley Symptom Index (PSI)
Dr. Robin Berzin, MD
Founder & CEO of Parsley Health
Not just good doctors.
The right ones for you.
Parsley providers are board-certified in conventional medicine and specially trained in functional medicine.
We offer clinical rigor and root-cause depth — without compromise.
Board-certified from top institutions
Practiced in conventional medicine
Advanced training in functional medicine
Evolve protocols with emerging science
Prescribe medications as appropriate
Progress tracking via clinically validated Parsley Symptom Index (PSI)
Dr. Robin Berzin, MD
Founder & CEO of Parsley Health
Meet your care team
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Data tells us a lot — but so do your history, habits, and lifestyle.
We build a complete picture of your health so we can uncover and treat the root cause.
Dr. Elizabeth Zapp, MDMedical Director
Conditions & symptoms we treat
Hormone Health & Balance
Fatigue, weight changes, PMS, acne, irregular cycles, hair loss, insulin resistances, PCOS
Autoimmune & Inflammation
Crohn’s disease, Hashimoto’s, lupus, psoriasis, rheumatoid arthritis, ulcerative colitis, joint pain
Unexplained Symptoms
Allergic reactions, anxiety, bloating, brain fog, fatigue, headaches, insomnia, joint pain, low mood, skin rashes
Mental & Emotional Health
Agitation, anxiety, brain fog, changes in appetite or weight, difficulty concentrating, fatigue, feeling hopeless, insomnia, irritability, loss of interest in activities, low mood
Heart Health
High cholesterol, hypertension, family history of heart disease, elevated inflammation markers, cardiovascular risk assessment
Metabolic Health
Weight gain or resistance, insulin resistance, prediabetes, type 2 diabetes, metabolic syndrome, GLP-1 support, unexplained fatigue
Longevity & Healthspan
Blood sugar imbalance, disease prevention, heart health, memory changes, muscle loss, sleep issues
Perimenopause & Menopause
Hot flashes, low libido, memory issues, mood swings, night sweats, sleep disturbances, weight changes, vaginal dryness
Fertility, Pregnancy, & Postpartum
Anemia, gestational diabetes, irregular periods, PCOS, PMS, postpartum recovery
Detox & Environmental Exposure
Mold exposure, chemical sensitivity, mercury and heavy metals poisoning, chronic fatigue, headaches
Conditions & symptoms we treat
Gut & Digestive Health
IBS, IBD, acid reflux, SIBO, leaky gut, constipation, diarrhea, food intolerances, bloating, gas
Hormone Health & Balance
Fatigue, weight changes, PMS, acne, irregular cycles, hair loss, insulin resistances, PCOS
Autoimmune & Inflammation
Crohn’s disease, Hashimoto’s, lupus, psoriasis, rheumatoid arthritis, ulcerative colitis, joint pain
Unexplained Symptoms
Allergic reactions, anxiety, bloating, brain fog, fatigue, headaches, insomnia, joint pain, low mood, skin rashes
Mental & Emotional Health
Agitation, anxiety, brain fog, changes in appetite or weight, difficulty concentrating, fatigue, feeling hopeless, insomnia, irritability, loss of interest in activities, low mood
Heart Health
High cholesterol, hypertension, family history of heart disease, elevated inflammation markers, cardiovascular risk assessment
Metabolic Health
Weight gain or resistance, insulin resistance, prediabetes, type 2 diabetes, metabolic syndrome, GLP-1 support, unexplained fatigue
Longevity & Healthspan
Blood sugar imbalance, disease prevention, heart health, memory changes, muscle loss, sleep issues
Perimenopause & Menopause
Hot flashes, low libido, memory issues, mood swings, night sweats, sleep disturbances, weight changes, vaginal dryness
Fertility, Pregnancy, & Postpartum
Anemia, gestational diabetes, irregular periods, PCOS, PMS, postpartum recovery
Detox & Environmental Exposure
Mold exposure, chemical sensitivity, mercury and heavy metals poisoning, chronic fatigue, headaches
A physician-led model that combines conventional and functional medicine
Parsley Health delivers functional medicine through a physician-led clinical model designed to be consistent, evidence-based, and deeply personalized. Our clinicians are board-certified and conventionally trained, with additional fellowship training in evidence-based functional medicine. Care is guided by shared clinical protocols and continuously refined through outcomes data, research, and physician oversight.
Nearby? Visit us in person.
We serve patients across the country. Our functional medicine providers deliver the same level of care and connection, whether online or in one of our centers.
Progress you can see and feel
We use our proprietary, clinically-validated Parsley Symptom Index (PSI) to track progress in our care. Parsley members complete the PSI before their first visit and consistently over time establish a baseline of symptom severity and track clinical progress. Nearly 9 out of 10 members report symptom improvement within their first year of care.
Frequently Asked Questions
Parsley clinicians are MDs, DOs, NPs, and PAs. They are board-certified and many have additional specialty credentials. Our care teams include physicians, nurse practitioners, and physician assistants who complete the same advanced functional medicine training and practice within a shared clinical system to ensure consistent, high-quality care.
Expert-led care, designed to work for your health.
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