Function Health: The Complete 2026 Guide You Need

Introduction

Most people only see a doctor when something goes wrong — but what if you could catch problems years before symptoms even appear? That’s the core promise of Function Health, a preventive health platform that’s quietly becoming one of the most talked-about tools in proactive wellness circles in 2026.

Longevity Health gives you access to over 100 lab biomarker tests, detailed personalized insights, and physician-reviewed results — all without a traditional doctor’s referral. In this guide, you’ll learn exactly what Function Health is, how it works, what it tests, what it costs, and how it connects to your mental and emotional well-being. Whether you’re new to the concept or ready to sign up, this is the honest breakdown you need.

What Is Function Health?

Function Health is a membership-based preventive health testing platform co-founded by Dr. Mark Hyman and Jonathan Swerdlin. Launched with the mission of democratizing access to comprehensive lab testing, it allows members to get a deep, data-rich picture of their health through an extensive blood panel — without needing a physician’s referral or an insurance approval process.

The platform is built on a simple but powerful premise: know your numbers before disease knows your name. Instead of waiting for illness to prompt a visit, Longevity Health equips you with the kind of detailed biological data that used to be reserved for elite executives and longevity clinics.

What Makes Function Health Different?

Traditional annual physicals typically test fewer than 20 biomarkers. Function Health tests over 100, spanning:

• Hormones (thyroid, sex hormones, cortisol, DHEA)
• Metabolic health (blood sugar, insulin, HbA1c)
• Cardiovascular risk (cholesterol panels, Lp(a), ApoB)
• Nutrient levels (vitamin D, B12, magnesium, omega-3)
• Inflammation markers (CRP, homocysteine)
• Organ function (liver, kidney, thyroid)
• Autoimmune indicators
• Cancer screening markers

This breadth of testing transforms a routine checkup into a comprehensive health audit — one that can surface hidden risks long before they become medical emergencies.

How Does Function Health Work?

The Function Health process is designed to be simple and accessible. Here’s what new members typically experience:

Step 1: Join the Membership

Function Health operates on an annual membership model. Once you join, you gain access to your first comprehensive lab panel.

Step 2: Get Your Blood Drawn

Function Health partners with Quest Diagnostics and LabCorp — two of the largest lab networks in the United States. You simply schedule a local blood draw appointment at a nearby facility. No hospital visit, no long waits.

Step 3: Receive Your Results

Within days, your results are uploaded to the Function Health dashboard. Every biomarker is presented with:

• Your actual value
• The optimal reference range (not just the “normal” range)
• A plain-English explanation of what it means
• Physician-reviewed commentary on out-of-range values

Step 4: Take Action

The real power is in what comes next. Function Health doesn’t just hand you numbers — it provides actionable insights tied to lifestyle adjustments, further testing recommendations, and suggested conversations with your primary care provider.

What Does Function Health Test? A Deeper Look

Function Health’s testing panel is one of the most comprehensive available outside a clinical research setting. Here’s a breakdown of key categories:

Hormonal Health

Hormones regulate nearly every system in your body — energy, mood, metabolism, sleep, and libido. Longevity Health tests:

• Thyroid panel (TSH, Free T3, Free T4, Reverse T3, thyroid antibodies)
• Adrenal function (cortisol, DHEA-S)
• Sex hormones (testosterone, estradiol, progesterone, FSH, LH)

Many people walk around with subclinical hormone imbalances that standard care never catches. Longevity Health surfaces these early.

Cardiovascular Risk

Heart disease remains the leading cause of death in the US. Function Health goes beyond basic cholesterol to include:

• Lp(a) — a hereditary risk factor that 20% of the population carries and most people never test for
• ApoB — a more accurate predictor of heart disease than LDL cholesterol
• hsCRP — a sensitive inflammation marker tied to cardiovascular risk

Metabolic Health

Metabolic dysfunction drives obesity, type 2 diabetes, and cognitive decline. The panel includes fasting insulin, HOMA-IR (insulin resistance score), HbA1c, and glucose — providing a nuanced picture of how your body handles energy.

Nutritional Status

Even people eating healthy diets can have surprising deficiencies. Longevity Health tests for vitamin D, B12, folate, magnesium, zinc, ferritin (iron stores), and omega-3 index — nutrients that directly impact energy, brain function, mood, and immunity.

Function Health and Mental Wellness: The Overlooked Connection

Here’s something most people miss: your biology directly shapes your mental health. Low thyroid function causes depression. Vitamin D deficiency worsens anxiety. High cortisol disrupts sleep and emotional regulation. Insulin resistance is now linked to cognitive decline and even mood disorders.

Function Health doesn’t position itself as a mental health platform, but the data it surfaces has profound implications for emotional well-being. When you understand what’s happening inside your body, you’re empowered to address the root causes of how you think, feel, and cope — not just the symptoms.

This aligns with a growing recognition in the health community that mental health awareness and physical health are deeply intertwined. You can’t sustainably improve one without attending to the other.

If you’re already using a health optimization platform like Longevity Health or Mochi Health for medically supervised weight management, adding mental health support to your stack creates a genuinely holistic care approach. For those who need accessible entry points, free mental health services near you can complement the insights you gain from biomarker testing.

What Does Function Health Cost?

Function Health operates on a subscription pricing model:

At approximately $499 per year for two comprehensive panels, Longevity Health works out to roughly $4.15 per biomarker tested per panel — significantly cheaper than ordering individual lab tests outside of insurance.

Is It Worth It?

For people who:

• Have a family history of chronic disease
• Are managing or preventing metabolic conditions
• Want to optimize performance, energy, or longevity
• Have felt “off” without a clear diagnosis

…the answer is almost always yes. The cost of discovering — and addressing — a single missed risk factor (like elevated Lp(a) or low vitamin D) far outweighs the membership price.

According to data from the Centers for Disease Control and Prevention, 6 in 10 American adults have at least one chronic disease, and 4 in 10 have two or more — most of which are preventable or manageable with early detection.

Function Health vs. Traditional Healthcare: A Realistic Comparison

What Traditional Annual Physicals Miss

Standard primary care visits typically include:

• Basic metabolic panel (14 markers)
• Lipid panel (basic cholesterol)
• CBC (complete blood count)
• Blood pressure and weight

That’s it. Important markers like Lp(a), ApoB, insulin, cortisol, thyroid antibodies, and most micronutrients are never ordered unless you have symptoms — which often means you won’t know until damage has already occurred.

What Function Health Adds

Function Health fills the gap between “your labs are normal” and genuinely optimal health. It gives you:

• Data on where you fall within optimal ranges, not just disease thresholds
• Trending data across panels to see improvement or decline over time
• Physician-reviewed insights translated into plain language
• A foundation for more productive conversations with your own doctors

Function Health: Who Is It Best For?

Longevity Health is an excellent fit for:

• Health-conscious adults who want proactive, data-driven insight
• People over 35 where chronic disease risk begins to rise
• Athletes and high performers optimizing recovery, energy, and cognition
• Anyone with a family history of heart disease, diabetes, cancer, or autoimmune conditions
• Those exploring longevity and healthy aging strategies
• People struggling with unexplained symptoms like fatigue, brain fog, mood changes, or weight gain

It is less suited for:

• Acute illness or emergencies (this is not urgent care)
• People who need insurance-covered diagnostics
• Those looking for a replacement for regular primary care

Actionable Tips to Get the Most Out of Function Health

1. Fast for 10–12 hours before your draw — most metabolic and lipid markers require fasting for accuracy
2. Test at the same time of year — seasonal variation in vitamin D and hormones can skew comparisons
3. Bring your results to your doctor — use Longevity Health data to drive better conversations with your primary care provider
4. Track trends, not single snapshots — one panel gives a picture; two panels a year reveal patterns
5. Connect your mental health — if results show hormonal or nutritional imbalances, explore how they may be affecting your mood and cognitive function
6. Don’t panic at out-of-range values — Function Health uses optimal ranges that are tighter than clinical cutoffs; many “flags” are opportunities, not crises

The Role of Preventive Health in a Mental Health Crisis

America is facing simultaneous crises in physical and mental health. The two are not separate. Emerging research consistently shows that metabolic dysfunction, nutritional deficiency, and hormonal imbalance contribute directly to anxiety, depression, and cognitive decline.

Platforms like Longevity Health represent a new model of care: one that’s proactive, personalized, and data-driven rather than reactive and symptom-focused. When you understand your body at this level, you’re better equipped to support your mental health from the inside out.

For those navigating mental health challenges alongside physical health optimization, it may be worth understanding how platforms like Headway connect patients with mental health providers — or exploring how a mental health walk-in clinic can provide immediate support while you work on long-term health optimization.

According to the World Health Organization, mental health conditions affect 1 in 8 people globally — and the gap between diagnosis and treatment remains enormous. Integrating physical health data through tools like Longevity Health into a broader wellness strategy is one meaningful way to close that gap.

FAQ: Function Health

1. What is Function Health and how does it work?

Function Health is a membership-based preventive health platform that provides access to comprehensive lab testing — over 100 biomarkers — through major lab networks like Quest Diagnostics and LabCorp. Members get results through a user-friendly dashboard with physician-reviewed insights and actionable recommendations.

2. How much does Function Health cost?

Function Health charges approximately $499 per year for membership, which includes two comprehensive lab panels annually. Individual add-on tests are available at extra cost. Insurance is not accepted, but HSA and FSA funds can typically be used.

3. Does Function Health replace my primary care doctor?

No. Longevity Health is a complement to, not a replacement for, primary care. The platform is designed to give you richer data to share with your own physicians — not to diagnose or treat conditions independently.

4. Is Function Health available nationwide?

Yes. Longevity Health partners with Quest Diagnostics and LabCorp, which have thousands of draw locations across the United States, making it accessible for most people regardless of where they live.

5. Can Function Health help with mental health issues?

Function Health doesn’t treat mental health conditions directly. However, many biomarkers it tests — thyroid hormones, cortisol, vitamin D, B12, inflammatory markers — are closely tied to mood, cognition, and mental wellness. Identifying and correcting imbalances in these areas can meaningfully support mental health alongside dedicated mental health care.

6. How is Function Health different from a standard blood test?

A standard blood test typically covers 14–20 markers focused on detecting disease. Longevity Health tests 100+ markers focused on optimizing health — including cardiovascular risk factors, hormonal balance, nutritional deficiencies, and metabolic function that standard care routinely misses.

Conclusion

Function Health is redefining what it means to know your own body. By delivering over 100 biomarker tests, physician-reviewed insights, and personalized health data directly to you, it shifts healthcare from reactive to proactive — from waiting for symptoms to preventing them.

The implications extend far beyond physical health. When your hormones are balanced, your nutrients are optimized, and your inflammation is controlled, your mental clarity, emotional resilience, and overall quality of life improve alongside your physical numbers. Longevity Health isn’t just a lab test — it’s a framework for living better.

Whether you’re managing chronic risk, optimizing performance, or simply tired of feeling “fine” without actually thriving, Longevity Health gives you the data to take control.

Ready to stop guessing and start knowing? Visit Function Health’s official website to join the waitlist or start your membership today. Your future self will thank you.