Parsley Health vs Function Health: functional medicine clinic vs lab membership
Last updated September 3, 2026.
Parsley Health and Function Health both attract people whose labs keep coming back "normal" while they still feel wrong, but they sell different depths of help. Parsley is a functional medicine medical practice: clinicians, visits, insurance. Function is a lab-testing membership: a very large panel of biomarkers, reviewed and explained, without becoming your doctor.
What does each one cost?
Function Health charges $365 a year for a membership built around 160+ lab tests, per its own site, with results explained by clinicians, but it is not a medical practice managing your care. Parsley Health is a medical practice: it now accepts insurance in all 50 states for visits, offers a $250 Clinical Lab Review as an entry point that credits toward its annual Complete Care membership if you continue, and bills lab work to insurance where possible, per its own site. Function is cheaper and broader on raw testing. Parsley is deeper: real doctors who can diagnose and prescribe.
What is the experience like?
Function Health is data-first: order the panel, get blood drawn at a lab, receive a clinician-reviewed summary of 160+ biomarkers, repeat over time to track trends. Parsley Health is relationship-first: a dedicated care team, multiple provider visits through the year, root-cause investigation of complex symptoms, and a structured annual program. Function tells you what your numbers say. Parsley tries to fix what the numbers mean, combining traditional, functional, and longevity medicine.
Which one should you pick?
If you want comprehensive baseline data on yourself and you are generally healthy, Function's panel is unmatched value per biomarker. If you have symptoms nobody has explained, need a doctor who will actually treat you, or want insurance to carry the load, Parsley is the medical practice in this comparison. And if you are still figuring out whether your symptoms are serious, Pymander's free AI doctor consult can help you frame the question before either membership. Emergencies bypass all of it: call 911. Pymander routes emergency red flags to 911, and its escalation logic is documented in its safety architecture working paper.
What a Pymander AI doctor consult looks like
Illustrative example, not a real member's messages.
Common questions
What is the difference between Parsley Health and Function Health?
Parsley is a functional medicine medical practice with clinicians who diagnose and treat, now accepting insurance in all 50 states. Function Health is a $365-a-year lab-testing membership covering 160+ biomarkers with clinician-reviewed results, but it does not provide ongoing medical care.
How much does Function Health cost?
$365 a year for membership covering 160+ lab tests, per its own site.
How much does Parsley Health cost?
Its Clinical Lab Review entry point is $250, which credits toward its Complete Care annual membership if you continue. Visits and standard lab work can bill through insurance in all 50 states; specialty tests and the membership itself are separate, per its own site.
Which should I choose for unexplained symptoms?
If you need treatment, prescriptions, and a doctor managing your case, Parsley, because it is a medical practice. If you want the broadest possible data snapshot first, Function, then bring those results to a clinician, Parsley explicitly accepts outside results from providers like Function.
Does either replace my primary care doctor?
Parsley says it does not replace your primary care doctor; it complements with root-cause care. Function is testing only and pairs with whatever doctor interprets the results.
What if it is an emergency?
Skip the workup question and call 911. Pymander is built to recognize emergency red flags in your text and direct you to call rather than continue.