Function Health (@function)

@mrbeast health challenge. $250,000 on the line. And lab tests through Function that showed Sara and Tré numbers they couldn’t ignore. After six months, they lost almost 160 pounds together. Now they’re back home. What does it take to make those changes last? Watch Sara and Tré’s full story. Link in bio.

You don’t play at an elite level at 40 by guessing about your health. Chris Paul uses data to understand what his body is telling him. Function members have access to 160+ lab tests. Know your numbers. Not medical advice. Consult a medical professional with any medical questions. For marketing purposes only.

4 snacks @rumerglennwillis always has on hand for her health: 1️⃣ Walnuts — They support brain health and libido. 2️⃣ Pumpkin seeds — A solid source of zinc, which plays a role in hormone regulation. 3️⃣ Cucumbers — An easy way to sneak veggies into her and her daughter’s day. 4️⃣ World’s Smartest Smoothie — Ingredients curated by Mark Hyman, M.D., and Function. These are the staples she keeps stocked for her and her family's health.

@rumerglennwillis' grocery bag has a few non-negotiables: ✔️Chickpeas — For salads, or homemade hummus if you're feeling ambitious. ✔️ ️Sardines — High in omega-3s and good for brain health. ✔️Brazil nuts — Just 2 covers your daily selenium, which supports thyroid function. ✔️Dark chocolate — 70% or higher, for lower oxidative stress and better blood flow to the brain. As she puts it: "If there wasn't already enough reason to love chocolate, I just gave you two more."

For those who love tracking their day-to-day health and want to see where it’s headed. @function and @google Health are partnering to bring your daily tracking and your lab results into one view. Google Health Coach pulls it all together into personalized health insights. Later this fall, millions of people will be able to track their day-to-day health—and see what’s behind it. This is about more information about your own body. With the simplicity and context that make it easier to make daily decisions.

Women deserve more information about their bodies. And more say in what happens next. We’re welcoming Dr. Jen Ashton to Function’s Medical & Scientific Board. A double board-certified physician in OB-GYN and Obesity Medicine, she’ll help guide our work in women’s health so more women can understand their biology, connect the dots, and make informed decisions about their health. After caring for thousands of women over two decades, this work is personal to her. She’s seen how earlier access to information can make a difference—and wants more women to have it. That’s central to Function’s mission to enable everyone to live 100 healthy years: helping people understand their health and take action earlier. Meet Dr. Jen Ashton and hear what drew her to Function.

Is "Ferritin Face" real? Here is what the science actually says. If you’ve seen the "Ferritin Face" trend popping up on your feed, you’re not alone. Posts claim that dark under-eye circles, sallow skin, and dullness are instant giveaways of low iron. Here is the breakdown: 1️⃣ It’s not a formal diagnosis: Dark circles can be caused by genetics, thin skin, or lack of sleep. While iron deficiency can cause paleness (which can make dark circles look darker), your face alone can’t diagnose your iron levels. 2️⃣ Diagnostic thresholds have changed: The American Society of Hematology (ASH) recently updated guidelines to recommend a higher ferritin threshold in most adults.— it's no longer 15ng/ml. 3️⃣ Check your health: Ferritin reflects your iron stores. It typically falls before hemoglobin and serum iron do, so it's one of the earlier signals of low iron. Always talk with your healthcare provider before taking iron supplements. @drmarkhyman Not medical advice. Consult a medical professional with any medical questions. For marketing purposes only.

You were told your iron levels are fine. But did anyone check your ferritin? Ferritin is a marker of the body’s iron reserves, and it can be low even when hemoglobin is within the lab reference range. And that difference matters when you’re trying to understand fatigue, thinning hair, trouble focusing, or changes in exercise performance. One number doesn’t tell the entire iron story.

Men often fear what they'll find when checking their health, but learning what’s actually happening in their body is what shifts the power back to them. That’s exactly what @function was built for.

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.

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."

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.

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.

Function gives you access to 160+ lab tests so you can better understand your health, track key biomarkers over time, and make more informed decisions.

The world’s longest-living populations share some surprisingly simple habits. But healthy habits are only part of the picture. Function gives you access to 160+ lab tests so you can better understand your health, track key biomarkers over time, and make more informed decisions. #health #brain

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.” @rumerglennwillis tests and tracks her health with 160+ lab tests through Function. You can, too.

“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

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.

“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

“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.” @rumerglennwillis

@rumerglennwillis 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.

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.

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 @claude. 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.

Do you want Claude to act like your personal health expert? Now you can. Connect @claude to Function.

What if ChatGPT actually knew your body? Learn how to connect Function to ChatGPT.

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, and more intention. To become the co-creator of her own healthy life. Function Member since 2025

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.

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?