The most comprehensive health check. 2,000+ locations. 160+ lab tests. Advanced imaging. Private AI chat. Starting at $1/day. Check your health.
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Share this with your loved ones.
Cari’s story could be their story.
Cari, a 51-year-old mom of 4, did lab testing through Function, including the Galleri® Multi-Cancer Test, and was alerted by the Function clinical team with life-changing news: The test had identified a signal linked to ovarian cancer.
She joined Function in pursuit of wellness. She never expected to learn about potential cancer. But this new information gave her the power to take control.
Cari completed ultrasounds to confirm the diagnosis. Stage 3B ovarian cancer—caught in the nick of time.
Early testing can change everything.
It’s time to test and know.
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We went on a hot girl walk with Rumer Willis and Dr. Danna Chung—and got a 101 guide to understanding your hormones.
The takeaway: Understand your body early. What's worth testing? Hormones, nutrients, inflammation, metabolism—so you can see the patterns of how your health may be shifting over time.
As Rumer puts it: "It's like making a map of your body."
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Your brain plays a key role in regulating your hormones—here's how to see a more complete picture.
An MRI can look at the brain itself, offering insight into whether something might be affecting those hormonal signals.
Labs and MRI each tell a different part of the story of your health.
Dr. Danna Chung's hope for Rumer's MRI results? "Really boring."
Because a boring brain = nothing concerning was found.
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Fertility isn’t really covered in medical school.
Dr. Danna Chung learned that firsthand—as a patient, and as a doctor working to close that gap for other women.
Her take: The experience of becoming a mother isn't one-size-fits-all. That's why knowing how your body is functioning matters—labs and an MRI together give a clearer picture.
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Becoming a mom changed how Rumer takes care of herself. Her advice:
- Start asking questions.
- Start tracking your cycle.
- Start gathering your own information so you can advocate for your health with confidence.
As she puts it, “When you have real information in your hand, it becomes a lot harder for people to ignore you.”
@TheRue tests and tracks her health with 160+ lab tests through Function. You can, too.
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“I’m the health nut in my family.
I'm the one slinging cotton underwear at my sisters and reminding my mom to stay on top of her health. Helping my family stay healthy feels more important than ever.
Next for me: An Annual MRI through Function. I want to know what’s happening inside my body and make sure I can be there for my family for decades to come.”
—Rumer Willis
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You know lab tests can give insights on what your body is doing. But what about where it’s happening?
That’s where MRIs come in.
Function’s Chief Medical Scientist Daniel Sodickson, M.D., PhD says they’re powerful together.
Together, labs and MRI give you a clearer understanding of what's happening beneath the surface.
Not medical advice. Consult a medical professional with any medical questions. For marketing purposes only.
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“I didn't expect small changes to move a hormone number.
I changed what I wore, what I ate, the products I used, and saw the numbers shift.
It's wild to see how much my daily choices can impact my health.
I tested my hormones through Function. You can, too.” — Rumer Willis
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“I'd have eight more kids if I could. That’s why protecting my fertility is one of the most important things to me. I want to know what's happening inside my body—before a problem shows up.
But sex ed never gave us the full picture, and by the time most people get their fertility checked, it can already feel late.
That’s why I’m taking my health into my own hands by testing through Function.” — Rumer Willis
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Rumer Willis shares a vulnerable, honest look at loving a parent who’s living with dementia—and what it’s taught her about caring for herself in the process.
She’s learned that being strong doesn’t mean choosing between missing who her dad was and being present with who he is now. It means holding both, while still taking care of herself in the process.
It’s why she checked her own inherited risk through an ApoE gene test, given her family history.
Check your health with Function.
*Access ApoE testing for an additional cost.
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We’ve spent years asking the internet health questions. Now AI can have more context about who’s asking.
Function members can now connect their lab results and Clinician Notes to the AI tools they already use.
@drmarkhyman @OpenAI @perplexity_ai
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True Story: Mason's hs-CRP had been high for months. His wife's was elevated, too.
Diet and lifestyle changes didn’t work. His doctors couldn’t explain why.
Then he connected his Function data to @claudeai. It pointed to something no one else had.
If both of their levels spiked at the same time, the cause was most likely environmental.
An inspection of their HVAC system confirmed active mold.
Days after the repair, Mason's inflammation marker dropped.
Function member since 2025.
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Do you want Claude to act like your personal health expert?
Now you can. Connect @claudeai to Function.
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What if ChatGPT actually knew your body?
Learn how to connect Function to @ChatGPT.
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True Story: Tierra was fit on the outside from teaching yoga and bodybuilding. But she didn’t know what was happening inside her body. Function gave her a deeper look. Revealing simple things like her blood type, and more serious signals like high LDL Cholesterol.
So she changed how she showed up:
- more rest
- smarter fuel
- more intention
To become the co-creator of her own healthy life.
Function Member since 2025.
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True Story: Holly, Function member since 2025
They called her "the napper." Holly was exhausted every single day.
When she tested with Function, her thyroid antibodies were more than 75 times the normal range.
Her thyroid hadn't been working for a decade and no doctor had ever caught it.
This test isn't offered in routine care, but it's absolutely standard for every Function member.
With an autoimmune diet and the right medication, her energy finally came back.
Now Holly isn’t just awake. She’s thriving.
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Tiffany Lester, MD, Function’s Women’s Health Medical Director, explains why we need to talk about creatine.
It’s one of the most researched supplements available.
So why are women just now hearing about it?
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We teamed up with @ErewhonMarket to build a smoothie designed around what your body actually needs. @drmarkhyman walks us through how every selected ingredient earned its place, chosen using Function's data on the health gaps most people have in common.
The World’s Smartest Smoothie? is only available at Erewhon locations.
First-time members only get a $25 credit toward a Function membership with purchase.
functionhealth.com/campaign/…
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Forty minutes later, Craig understood why.
The Annual MRI with Spine can look for signs of cancer, prior stroke, fatty liver, herniated discs, and more.
Because a parent knowing more about their health is a gift to the whole family.
Now available to all Function members in 200+ locations. functionhealth.com/scans
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For Tova, every birthday past 39 is a milestone.
That's the age her father died of cancer.
Every year since has felt like both a gift and a reminder: never take your health for granted.
That's why she gets an annual MRI.
Because the goal isn't simply to live longer.
It's having more time with the people she loves.
Now available to all Function members in 200+ locations.
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True Story: Ana was a lifelong marathon runner. But she was battling muscle pain, twitching, brain fog, and crushing fatigue. Function helped uncover critically low ferritin and sodium, key markers that were missed for years. Now, she’s showing up stronger and more energized for the people she loves.
Function member since 2025.
Function gives you access to 160+ lab tests to get deeper insights into your health. Join today for $365/ year and take control.
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True Story: After her pregnancies, Sarah faced debilitating postpartum depression and anxiety.
Through Function, she uncovered low nutrient levels, out- of- range heart markers, and a common MTHFR gene variant involved in folate metabolism. Insights she wishes she had earlier in her fertility journey.
Now she feels informed, empowered, and more in control of her health.
Function member since March 2024.
Function gives you access to 160+ lab tests to get deeper insights into your health. Join today for $365/ year and take control.
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True Story: Erin lost her baby girl to a rare brain tumor.
The unimaginable grief turned into a fierce determination to understand her own body.
Function helped reveal heart risk, anemia, and signs of chronic stress.
Clarity that finally gave her a path to heal.
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True story a Function Team Member: My dermatologist said get labs. I already had 160+ of them.
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Shoutout to every dad who has never once researched his own symptoms but automatically fixes your car, dinner, WiFi, and your heart.
Happy Father's Day to every dad out there doing the thing 🧡
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True Story: Cameron had no symptoms and no idea he had a genetic condition causing his body to absorb too much iron.
Through Function, he discovered his Ferritin, a marker of iron storage, was nearly 500. Well above range.
Further testing revealed hereditary hemochromatosis.
Now, he donates blood regularly and is taking steps to protect organs he didn’t know were at risk.
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True Story: Ralph had no symptoms and no idea he was at higher risk for a heart attack.
Tests revealed an elevated Lp(a) and a calcium score over 600. A silent threat Ralph only discovered through Function.
That data sparked his transformation.
Today, Ralph is a certified health coach on a mission to help others catch what he almost missed.
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True Story: At 37, Jennifer uncovered a critically low Ferritin level through Function.
Something her routine labs had missed for years.
That one result pushed her to dig deeper with a follow-up colonoscopy that revealed two large, high-risk precancerous polyps.
She had them removed early, boosting her energy and potentially changing the course of her life.
Function member since 2025.
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You know your thoughts can affect your body.
But your body can also affect your mind.
Key nutrient levels can be involved in your mood.
Your body wants to be well.
Get a deeper look.
Check your health.
Featuring @drmarkhyman and @jayshetty.
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What if you could see inside your body before symptoms showed up?
@DanielSodickson, M.D., PhD, Chief Medical Scientist at Function, believes in starting annual MRIs early.
To check signals for hundreds of conditions, including signs of cancer.
Not to create fear. But to create context.
Because the earlier you know what’s normal, the sooner you can catch what’s not.
@drmarkhyman
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True Story: Meagan suffered through unexplained vitiligo, crushing anxiety, and exhaustion for years.
Through Function, she discovered heart disease risk, severe iron deficiency, and inflammatory markers that standard exams missed.
Function member since 2025.
Function gives you access to 160+ lab tests to get deeper insights into your health. Join today for $365/year and take control.
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Your symptoms are common.
Fatigue. Dry skin. Low mood. Low-grade inflammation.
We adapt. We dismiss. We make them our baseline.
But that’s the risk.
Because together, these signals can point to something deeper like autoimmune disease.
Don’t normalize the noise.
Check your health.
Featuring @drmarkhyman and @jayshetty.
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Good news: This is possible with Function + Claude Pro/Max.
Head to customize (on the left side tool bar) —> Connectors —> search "Function" —> click Browser Connectors —> type in "Function" —> hit connect
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This one's for every woman who knew something was off… and was told otherwise.
PCOS (Polycystic Ovary Syndrome) has been renamed PMOS: Polyendocrine Metabolic Ovarian Syndrome. The name finally reflects what this condition actually is. A metabolic and endocrine issue, not just an ovarian one.
And there's more: a simple AMH blood test can now replace a transvaginal ultrasound for diagnosis. That's a real shift in access.
The science caught up. Your experience was always valid.
Drop your thoughts below 👇
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Long live moms.
And all you do, and all we owe of you.
For making us out of nothing.
For the sleepless nights, the packed lunches, the drives to practice—and still showing up the next day.
For teaching us how to walk, how to eat, how to say please and thank you. For crying when we left, and welcoming us back when we needed you.
Thank you for everything.
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Share this post with a woman who needs this reminder: It’s not your imagination. Perimenopause can start earlier than you think.
Function gives access to 160+ lab tests so you can finally understand what's happening in your body.
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Disease can be influenced by your daily choices. So can your health.
What you cook.
How you handle stress.
The habits you repeat.
The power was never only in the doctor's hands.
It's in yours.
Check your health.
@drmarkhyman @jayshetty
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Watch the full podcast episode here: piped.video/watch?v=n0SCIl2R…
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You track your steps. Your sleep. Your spending.
But what about your biology?
People may be left guessing until something feels off.
@DanielSodickson M.D., PhD and @drmarkhyman , M.D. explore a new way to get deeper health insights.
Start with access to 160+ lab tests that check for thousands of signals, and the option of MRI and CT to look for signs of cancer and 100s of potential conditions.
Together, they can give you a clearer picture of your body’s signals and structures.
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Earth Day reminder: your body is built for nature.
The ocean doesn’t just calm your mind—it impacts your biology.
From negative ions in sea air to the benefits of blue spaces, spending time by the water can shape both your mental and physical health.
Want to see how your body responds to more time by the sea?
Test the biomarkers mentioned in this post to see the impact.
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The difference between a clear mind and brain fog often begins with what you eat. @drmarkhyman
What’s on your plate shapes how you think, feel, and age.
Start with these 5 foods to support your brain health.
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True Story: Meagan suffered through unexplained vitiligo, crushing anxiety, and exhaustion for years.
Through Function, she discovered heart disease risk, severe iron deficiency, and inflammatory markers that standard exams missed.
Function member since 2025.
Function gives you access to 160+ lab tests to get deeper insights into your health. Join today for $365/year and take control.
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Chronic inflammation isn't always loud.
It can be quiet. Building in your gut. In your tissues. In your fat.
And most people don't connect it to what's on their plate.
Change what you eat and see what shifts in your body over time.
@drmarkhyman @jayshetty
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Just like Chris Paul said: Information is king.
With Function, get the results of 160+ lab tests all in one place.
Featuring @drmarkhyman and @CP3
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Staying healthy isn't just a personal win. It's the greatest gift you can give the people you love.
Featuring @drmarkhyman and @CP3.
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Spoiler: The food industry isn't built to nourish you.
It's engineered for shelf life. Engineered for profit.
Your body responds to what you put in it.
Check your health.
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Eat different.
What’s “healthy” isn’t universal—it’s individual.
Test to understand the difference between what’s “good for you” and what’s good for your biology.
✅ Start with 160+ lab tests. functionhealth.com
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4️⃣ Why raw food works for some people:
🔎 It can increase exposure to certain vitamins, enzymes, and heat-sensitive compounds in whole foods.
Why 👉 Cooking can reduce the availability of some nutrients, while raw preparation preserves them in their original form. For others 👉 Raw food diets may be difficult to tolerate for those with digestive issues.
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3️⃣ Why intermittent fasting works for some people:
🔎 Time-restricted eating (limiting food intake to a shortened daily window), may improve insulin sensitivity and overall metabolic health.
Why 👉 Longer breaks from eating can allow insulin levels to drop naturally, promote fat loss,and reduce systemic inflammation.
For others 👉 Intermittent fasting may make blood sugar harder to manage and may not be appropriate for those with certain medical conditions, such as diabetes, or higher nutrient needs.
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2️⃣ Why plant-based works for some people:
🔎 Plant-based eating can support lower cholesterol levels—an important marker for cardiovascular health.
Why 👉 Eating more healthy plant-based fats and fiber can help your body handle fats better and lower harmful cholesterol levels over time. For others 👉 Those with higher protein needs must take care to incorporate diverse, protein-rich plant sources to meet their requirements.
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