Function Health vs InsideTracker: Best Blood Testing Service in 2025 & 2026?

In the era of personalized health and data-driven wellness, two names stand out in the blood testing space: Function Health vs InsideTracker. Both platforms promise insights into your biology, helping you take control of your health through regular lab testing and actionable recommendations. But how do they stack up against each other in 2025—and looking ahead into 2026?

Whether you’re a biohacker, a wellness enthusiast, or simply looking to optimize your long-term health, this deep-dive comparison will help you decide which service is the better fit for you.

What Are Function Health and InsideTracker?

Function Health

Function Health offers a comprehensive blood testing platform built around annual lab work, testing 100+ biomarkers across critical health systems—cardiovascular, hormonal, metabolic, nutrient levels, and more.

• Founded by: Dr. Mark Hyman and collaborators
• Core approach: Functional medicine meets modern lab testing
• Key feature: Lifetime health tracking with deep biomarker analysis
• Membership model: Annual subscription starting at around $499/year
  

Function Health stands out by providing full access to your lab results, unlike many traditional healthcare systems that gatekeep tests or only share partial results.

InsideTracker

InsideTracker is a performance-focused health platform that combines blood testing, DNA, and fitness tracking (e.g., Apple Health, Garmin, Fitbit) to provide personalized nutrition and lifestyle recommendations.

• Founded by: Scientists from Harvard, MIT, and Tufts
• Core approach: Optimize performance and longevity
• Key feature: Actionable plans with daily habit recommendations
  
• Plans: Blood tests start around $189/test; bundles available
  

InsideTracker caters heavily to athletes, high performers, and those focused on longevity optimization.

Biomarker Testing: Depth & Breadth

Winner for testing depth: Function Health

If you’re looking for comprehensive lab work across multiple systems, Function Health offers broader coverage.

Health Insights & Recommendations

• Function Health gives you full lab reports plus personalized interpretations aligned with optimal functional ranges, not just disease thresholds.
• InsideTracker translates your results into daily goals, like “Eat more magnesium-rich foods” or “Get 20 minutes of sunlight,” aiming to optimize your healthspan.

Winner for actionable coaching: InsideTracker

While Function gives more data, InsideTracker is stronger at translating it into behavior change.

Pricing & Plans (as of late 2025)

Function Health’s membership model may offer better value for comprehensive annual testing. InsideTracker, however, allows à la carte testing more frequently if you’re tracking progress every quarter or training for specific goals.

Pros & Cons

Function Health

Pros:

• Most comprehensive biomarker panel
• Lifetime tracking of all tests
• Transparent lab data
• Functional medicine insights

Cons:

• Less focus on daily habit recommendations
• No wearable integration (yet)
• Annual-only testing model may not suit everyone
  

InsideTracker

Pros:

• Excellent app and recommendations
• Integrates wearables and DNA
• Customizable test panels
• Strong for athletes and longevity optimization

Cons:

• Fewer biomarkers tested
• It can get expensive with frequent testing
• More lifestyle-focused than clinically comprehensive

Looking Ahead: 2026 Trends

Here’s what to watch for in the coming year:

• AI-driven health optimization: Expect smarter, more predictive health insights based on your longitudinal data.
• Integration with EHRs and wearables: Function Health may move toward integrating with devices like Oura, Apple Watch, or even electronic health records.
• Consumer control of lab data: Both platforms are part of a broader shift toward patient-owned health data.

Final Verdict: Which Is Best?

Choose Function Health if:

• You want the most comprehensive snapshot of your internal health
• You prefer annual lab work with in-depth analysis
• You’re interested in functional medicine and root-cause approaches

Choose InsideTracker if:

• You want ongoing lifestyle coaching and habit nudges
• You’re optimizing for performance, recovery, and longevity
• You use wearables and like app-based health tracking

Conclusion

Both Function Health vs InsideTracker are powerful tools, but they serve slightly different goals. Function Health is ideal for deep, data-rich health monitoring. InsideTracker shines for users looking to take action on their health data—especially athletes or longevity-focused individuals.

The best choice in 2025–2026 depends on your goals, lifestyle, and how involved you want to be in your health journey.

FAQS

What is the main difference between Function Health and InsideTracker?

Function Health focuses on comprehensive annual lab testing with over 100 biomarkers and functional medicine insights. InsideTracker, on the other hand, emphasizes performance optimization, frequent testing, and personalized lifestyle recommendations.

Which service tests more biomarkers?

Function Health tests over 100 biomarkers, whereas InsideTracker tests around 40–45, depending on the plan.

Which one is better for athletes or fitness enthusiasts?

InsideTracker is better suited for athletes and active users due to its habit tracking, wearable integration, and performance-focused metrics.

Is blood testing done at home or at a lab?

Both services typically require you to visit a partner lab (like Quest Diagnostics). InsideTracker may offer mobile phlebotomy (in-home testing) in select areas for an extra fee.

Do I need a doctor’s referral to use these services?

No, both Function Health and InsideTracker are direct-to-consumer services. No doctor’s referral is required.