Function Health Alternatives: 5 Ways to Track Your Biomarkers Without the Clinic Visit
Function Health tests 160+ biomarkers twice a year with clinician review — but has no wearable integration and no daily feedback. These five alternatives give you different ways to track biomarkers and biological age on your own terms.
Written by the Nuvo Longevity editorial team at Firefly Labs LLC.
Function Health tests over 160 biomarkers twice a year at $499 annually, with a clinician reviewing every result. That's a serious offering. But it has a real gap: no wearable integration, no daily feedback, and no way to see how your habits are actually moving your numbers between those two lab visits.
If you've been using Function Health or considering it, you've probably noticed the pattern. Results arrive, you read them, and then you wait six months for the next snapshot. What happens in between is invisible.
These five approaches give you different ways to track biomarkers and biological age on your own terms, without requiring a clinic visit every time you want data.
1. Nuvo: Daily Biological Age From Your Apple Watch and Blood Results
Nuvo is the most direct answer to Function Health's biggest limitation. Instead of a result twice a year, Nuvo recalculates your biological age every day using 37 longevity biomarkers drawn from both your Apple Watch and your blood test results.
It pulls wearable data through HealthKit in real time — heart rate variability, resting heart rate, VO2 max, sleep stages, activity — and combines that with blood values you enter manually: HbA1c, fasting glucose, HDL cholesterol, CRP, creatinine, albumin, ApoB, and others. All 37 biomarkers feed into one score that updates daily.
What makes it different from Function Health
Function Health has no wearable integration. Your Apple Watch data and your lab results live in completely separate places, and nothing connects them. Nuvo bridges both in a single number.
There's also no habit tracking in Function Health. Nuvo logs recovery interventions — sauna, cold plunge, breathwork, meditation, red light therapy, massage — directly against your biological age score, so you can see what actually moves it over time. That feedback loop doesn't exist anywhere else.
Privacy architecture
Nuvo runs entirely on-device, encrypted. No account required. No data transmitted to external servers. For anyone who has looked at Function Health's data-sharing model and felt uneasy, this is a concrete architectural difference — not a policy statement.
Nuvo is available on iPhone and Apple Watch at $2.08 per month billed annually. Learn more at nuvolongevity.com.
2. InsideTracker: Blood Biomarker Depth With Scientific Credibility
InsideTracker combines roughly 40 blood biomarkers with DNA analysis and has a founding team from MIT and Tufts. The scientific credibility is real. If you want validated, research-backed interpretation of your blood panel, it delivers that.
The trade-off is cost and cadence. InsideTracker runs $489 or more in year one, and like Function Health, it produces scores on a lab-visit schedule rather than daily. There's no Apple Watch-native daily loop — your biological age score updates when you complete a new lab draw, not when you go for a run or log a solid night of sleep.
It's a strong choice if you want deep blood analysis with DNA context and you're comfortable with the price. Less useful if daily feedback from your wearable is what you're after.
3. Humanity: Wearable-Only Biological Age Scoring
Humanity produces a biological age score from wearable data alone, no blood test required. That makes it easy to start. The app connects to Apple Health and other sources to generate a score based on activity, sleep, and heart rate patterns.
The limitation is the same one that affects most wearable-only tools: blood biomarkers carry significant predictive weight for biological age. HbA1c, CRP, and fasting glucose tell you things no wrist sensor can detect. A wearable-only score is useful context, but it's an incomplete picture.
Humanity charges up to $180 per year, with a free tier that users describe as limited. It's a reasonable entry point if you're not yet doing regular blood panels and want to start tracking biological age from your existing device.
4. At-Home Lab Testing Services
Several services now let you order blood panels online, collect samples at home or at a local draw site, and receive results digitally. This doesn't replace Function Health's clinician review, but it gives you more frequent access to your own data at a lower cost per draw.
The real value is frequency. If you're tracking how lifestyle changes affect your CRP or HbA1c, a six-month gap between measurements makes it nearly impossible to connect cause and effect. Running a targeted panel every 8 to 12 weeks tightens that loop considerably.
The biomarker trends worth watching in 2026 include HbA1c, CRP, VO2 max, and telomere-adjacent markers — knowing which panels to prioritize helps you spend your testing budget efficiently rather than testing everything at once.
At-home testing won't match Function Health's 160-biomarker breadth, but for tracking the markers most tightly linked to biological age, a focused panel run quarterly often tells you more than a comprehensive one you only see twice a year.
5. WHOOP: Continuous Sensor Data With a Biological Age Metric
WHOOP offers 24/7 sensor data and includes a WHOOP Age metric on its $239 per year Peak tier. If you want continuous physiological monitoring and are willing to pay for proprietary hardware, it provides serious depth on recovery, strain, and sleep.
The gap is blood biomarkers. WHOOP has no integration with lab results, so its biological age metric is derived entirely from wearable data. It reflects how your body is performing day to day — not what your metabolic markers look like underneath.
It also requires you to wear their specific device. If you already own an Apple Watch, you're paying for hardware you may not need. Nuvo runs on the Apple Watch you already own, which is a meaningful practical difference for most people in this category.
How to Choose Between These Approaches
The right choice depends on what you're actually trying to answer.
If you want the deepest possible blood panel with clinician oversight twice a year, Function Health is still strong. But if you want to understand how your daily habits connect to your biological age, you need something that updates more frequently and integrates your wearable data.
A practical framework:
- Daily biological age with blood and wearable data combined: Nuvo
- Deep blood analysis with DNA context: InsideTracker
- Wearable-only biological age without blood tests: Humanity
- More frequent blood testing without the $499 annual commitment: At-home lab testing
- Continuous physiological monitoring and you don't mind proprietary hardware: WHOOP
Many people in this space use more than one approach. You might run a targeted blood panel every quarter, enter those results into Nuvo, and let your Apple Watch fill in the daily picture between draws. That combination gives you both depth and frequency.
If you're working on lowering your biological age through habit changes, the real-world biomarker results from people tracking HbA1c, CRP, VO2 max, and biological age together are worth reading before you decide which tools to use.
The goal isn't to replicate a clinic visit at home. It's to build a feedback loop that makes your daily choices visible in your biology. Function Health gives you a detailed snapshot. These alternatives help you understand what's happening in between.
Frequently Asked Questions
What is the main limitation of Function Health for daily health tracking?
Function Health tests over 160 biomarkers twice per year with clinician review, but it has no wearable integration and no daily biological age score. Your Apple Watch data and your lab results remain in separate apps with no single number connecting them.
Can I use Nuvo alongside Function Health?
Yes. You can enter your Function Health blood results directly into Nuvo, which combines them with your Apple Watch data to calculate a daily biological age score. This gives you daily updates between your twice-yearly Function Health draws.
Which Function Health alternative works best without a blood test?
Humanity and WHOOP both produce biological age or health scores from wearable data alone, without requiring blood test input. The trade-off is that blood biomarkers like HbA1c and CRP carry significant predictive weight that wearable sensors cannot detect.
Is Nuvo private? Does it share my health data?
Nuvo processes all data on-device, encrypted. No account is required to use the app, and no data is transmitted to external servers or sold to third parties. This is an architectural design decision, not just a policy.
How often does Nuvo update your biological age score?
Nuvo recalculates your biological age every day using real-time Apple HealthKit data from your Apple Watch combined with any blood biomarker values you've entered. The score reflects your current status, not a snapshot from your last lab visit.
What blood biomarkers does Nuvo track?
Nuvo ingests HbA1c, fasting glucose, HDL cholesterol, CRP, creatinine, albumin, ApoB, alkaline phosphatase, lymphocyte percentage, MCV, red cell distribution width, white blood cell count, and others — 37 longevity biomarkers in total, combined with wearable data.
Is InsideTracker a good alternative to Function Health?
InsideTracker is a strong alternative if you want deep blood analysis with DNA context and scientific credibility. It costs $489 or more in year one and produces scores on a lab-visit cadence rather than daily. It does not have an Apple Watch-native daily loop.
The gap Function Health leaves open isn't about the quality of its testing. It's about what happens between visits. If you want to see how your habits are actually moving your biology, you need a tool that updates every day, not twice a year. That's the problem these alternatives are built to solve. Start with nuvolongevity.com if you want to see what a daily biological age score looks like on the Apple Watch you already own.