Micronutrient-dense
Thistle meals are rich in plant-forward nutrients. Function tests key nutrients like Iron, Magnesium, Zinc, Omega 3s, and more—so you can learn what your body needs.
160+ lab tests
Total each year
Whole body
Tested 2x per year
$1 per day
$365 per year
Eat with confidence.
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160+ lab tests
Test inflammatory markers, nutrients, and more at one of 2k+ Quest Diagnostics locations.
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Turn insights into action
Get results explained by top doctors that help inform what your body needs next.
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Track the impact
Tailor what's on your plate, then test again to see the impact of your daily choices.
See if what you're eating is actually working.
Function includes 160+ lab tests that help you know what to eat, and what to avoid, for better health. New Function members receive an email after signup unlocking $200 off their first six weeks of Thistle meals—making it easy to eat what your body loves.
*Offer valid for new Function and Thistle members only. Check if Thistle delivers to your area in the FAQs. Codes are sent within 48 hours of signup. Cannot be combined with other promotional offers. See additional terms below.
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Anti-inflammatory
Thistle meals prioritize anti-inflammatory ingredients. Function tests inflammatory markers like hs-CRP, so you can see how levels are trending.
High-protein
Thistle meals deliver 20–40g+ of protein per serving to support steady energy. Function tests metabolic markers so you can see how your body responds.
Fiber-rich
Thistle meals contain 10–15g of fiber per serving, supporting heart health. Function tests heart biomarkers so you can monitor the bigger picture.
See if what you're eating is actually working.
Function includes 160+ lab tests that help you know what to eat, and what to avoid, for better health. New Function members receive an email after signup unlocking $200 off their first six weeks of Thistle meals—making it easy to eat what your body loves.
*Offer valid for new Function and Thistle members only. Check if Thistle delivers to your area in the FAQs. Codes are sent within 48 hours of signup. Cannot be combined with other promotional offers. See additional terms below.
Micronutrient-dense
Thistle meals are rich in plant-forward nutrients. Function tests key nutrients like Iron, Magnesium, Zinc, Omega 3s, and more—so you can learn what your body needs.
Anti-inflammatory
Thistle meals prioritize anti-inflammatory ingredients. Function tests inflammatory markers like hs-CRP, so you can see how levels are trending.
High-protein
Thistle meals deliver 20–40g+ of protein per serving to support steady energy. Function tests metabolic markers so you can see how your body responds.
Fiber-rich
Thistle meals contain 10–15g of fiber per serving, supporting heart health. Function tests heart biomarkers so you can monitor the bigger picture.
160+ lab tests chosen by top doctors
“The most powerful approach I’ve seen in my career. Uncompromising depth with no shortcuts.”
Hormones & thyroid
16 Biomarkers
- Thyroxine (T4) Free
- Thyroglobulin Antibodies (TgAb)
- Testosterone, Total
- Anti-Mullerian Hormone
- Thyroid-Stimulating Hormone (TSH)
Nutrients
19 Biomarkers
- Iron
- Calcium
- Magnesium
- Omega-3 Total
- Zinc
Heart & metabolic
18 Biomarkers
- LDL Small
- Lipoprotein (a)
- Apolipoprotein B (ApoB)
- Omega-3 Total
- Insulin
Aging
34 Biomarkers
- Sex Hormone Binding Globulin (SHBG)
- DHEA-Sulfate
- Insulin-like Growth Factor (IGF-1)
- Homocysteine
- Vitamin D
Mental health & focus
20 Biomarkers
- Cortisol
- High-Sensitivity C-Reactive Protein (hs-CRP)
- Iron
- Ferritin
- Methylmalonic Acid (MMA) (B12 Proxy)
Plus, bring your results wherever you go
Share with your doctor or connect directly to AI.
Not your average checkup
Standard checkup
160+
Lab tests annually
~26
Personalized action plan
Upload past results
No insurance needed
Every 6 months
Hormones & fertility testing
Heavy metal & toxin testing
Metabolic & pancreatic testing
Heart testing beyond cholesterol
Nutrient/electrolyte testing
Autoimmunity testing
Thyroid testing
Access to MRI & CT
Access to Galleri® Multi-Cancer Test
Access to Alzheimer's & brain testing
Access to mold-reactivity testing
Standard checkup
Lab tests annually
160+
~26
Personalized action plan
Upload past results
No insurance needed
Every 6 months
Hormones & fertility testing
Heavy metal & toxin testing
Metabolic & pancreatic testing
Heart testing beyond cholesterol
Nutrient/electrolyte testing
Autoimmunity testing
Thyroid testing
Access to MRI & CT
Access to Galleri® Multi-Cancer Test
Access to Alzheimer's & brain testing
Access to mold-reactivity testing
The new standard for health
Health for a new, discerning generation
“I’ve been so impressed by Function.”
Andrew Huberman
"Function helps me understand my own biology."
Baya Voce
"I deeply believe in Function's mission."
Jay Shetty
"Helped me finally identify imbalances and optimize my hormones."
Mari Llewellyn
Gold standard testing, on your schedule
Labs trusted by the medical community. Test at 2000+ Quest locations nationwide, or schedule an at-home blood draw with a licensed specialist.
Over 75 million results delivered to Function members
75M+
75M+
2,000+ lab test locations across the US
2,000+
2,000+
Or we’ll come to you—have a licensed specialist come to your home or office.
What could cost you $15,000 is $365
Plus, new members get $200 off Thistle meals—making it easy to eat for your biology.
- 160+ lab tests annually
- Tested 2x a year and on-demand
- Insights from top doctors and researchers
- All-in-one for your whole body
- Tracked in one secure place
- Clinicians review every result and flag issues
- Personalized protocol for instant action
- Add MRI and CT scans anytime
- No insurance, transparent pricing
Frequently asked questions
What is Function?
Function is a membership that gives you access to 160+ lab tests, doctor-reviewed insights, and a personalized health plan so you can understand your results and take action over time.
Which tests are included with a Function membership?
Members get access to 160+ lab tests annually, covering heart, hormones, thyroid, liver, and kidneys, as well as potential heavy metal exposures, nutrient levels, inflammation, potential cancer signals, and more. See all that's included here.
What is the Thistle offer?
As a Function member, you get a $200 credit toward Thistle, the fresh, healthy meal-delivery service. It's a $50 credit on your first order, then a $30 credit on each of your next five weekly orders — six weeks, $200 total.
Who is eligible to claim the Thistle offer?
This offer is for new customers only and is valid in the U.S. where Thistle delivers (see below). You will receive $200 off your first 6 consecutive weeks of Thistle: $50 off your first week and $30 off each of the following 5 weeks, for a maximum total savings of $200. One use per customer. Thistle credit expires Saturday, October 31 at 11:59 PM PST. No cash value. Promotion codes cannot be combined with other promotional offers. Offer is discontinued upon cancellation. Thistle reserves the right to extend, modify, or discontinue this offer or change these terms at any time without notice. By signing up for a Function membership, you understand and agree that your name and email address will be shared with Thistle to validate activation of your membership.
Thistle currently delivers in the following regions:
West Coast
- San Francisco Bay Area, Napa & Sonoma, Sacramento, Davis, Reno-Tahoe, Los Angeles, San Diego, Santa Cruz, Orange County, Inland Empire, Ventura County, Palm Springs, Santa Barbara, Santa Cruz, Monterey, Las Vegas, Phoenix, Tucson, Portland, Salem, Seattle-Tacoma, Olympia, Salt Lake City, Park City, Denver, Fort Collins, and Colorado Springs
East Coast
- New York City, Philadelphia, Washington D.C., Arlington, Richmond, Norfolk, Virginia Beach, and parts of New Jersey, Delaware, Maryland, Massachusetts, Rhode Island, Hartford, Raleigh, Charlotte, and Atlanta
Midwest
- Chicago metropolitan area, Madison, Milwaukee, and Minneapolis
How do I redeem the Thistle offer?
Sign up for Function here. Once you're a member, we'll email you within 48 hours with instructions on how to redeem the $200 Thistle offer at thistle.co. Redeem the offer before Saturday, October 31 2026 at 11:59 PM PST, and Thistle will automatically apply the credit across your first 6 weekly orders.
Do I have to sign up for Thistle to keep my Function membership?
No. Function membership and Thistle are independent. Using—or skipping—the Thistle credit doesn't change your Function membership.
What if I have issues with my Thistle code?
For help with your code or Thistle subscription, contact Thistle's support team at thistle.co/contact. For anything related to your Function membership, contact Function's support team.