InsideTracker Ultimate vs Function Health: Which Is Better in 2026?

For most people, we'd recommend Function Health first — with a clear exception. At $499 a year for two draws of 110+ biomarkers each, Function delivers the broadest consumer blood screening available, including advanced markers like ApoB, fasting insulin, and thyroid antibodies that can be surprisingly hard to get ordered through a typical doctor's visit. It's the better value per data point and the better baseline-and-trends tool. The exception: if what you actually want is to be told what to do, InsideTracker Ultimate is worth its $589-per-panel price. It measures fewer markers (around 43) but converts them into ranked, personalized food and supplement recommendations plus its InnerAge biological age score — interpretation and intervention guidance that Function largely leaves to you or your physician. Put simply: Function surfaces more data; InsideTracker does more with less data. Choose based on whether you have someone (yourself included) equipped to act on 110+ raw markers — if not, InsideTracker's prescriptiveness is the feature that matters. Both require a US lab visit.

The experiential difference shows up the moment results land. Function presents a large dashboard: 110+ markers flagged against optimal-range frameworks, built for scanning, spotting outliers, and tracking trends across its twice-yearly cadence. It's genuinely comprehensive — and genuinely a lot. Users without a knowledgeable provider (or strong health literacy) can find themselves staring at flagged values wondering what, concretely, to change.

InsideTracker answers that question directly. Its platform ranks food and supplement recommendations by projected impact on your specific markers, and its InnerAge score gives you a single optimization target to move between tests. In day-to-day use it feels less like a lab report and more like a plan.

Structural differences worth weighing:

Note the pricing asymmetry: two InsideTracker panels a year approach $1,200, while Function's membership includes two draws for $499. If you plan to retest regularly, Function's economics are hard to beat. And a standard YMYL reminder we'd give with either: consumer panels are screening and optimization tools, not a substitute for a physician's diagnostic workup.

Choose Function Health if you want the widest possible biomarker net — especially markers your doctor won't easily order — plan to retest and track trends over years, and either have a knowledgeable provider or are comfortable interpreting results yourself. The per-marker value is unmatched.

Choose InsideTracker Ultimate if you want your blood work translated into a ranked action plan of food and supplement changes, you're an athlete tuning performance, or the InnerAge biological-age target motivates you. Also pick it if you want a single test without committing to an annual membership.

Look elsewhere if you need at-home collection (both require lab visits; finger-prick options like Thorne exist), or you're outside the US, where Function isn't available.

These are arguably the two best consumer blood-testing platforms right now, and they're more complementary than competitive: one maximizes breadth, the other maximizes actionability. Neither choice is a mistake — the mistake is paying for data you won't act on.