The world's healthiest smoothie?

Health isn’t one-size-fits-all. It’s personal, nuanced, and different for everyone. Erewhon and Function partnered to intentionally select every ingredient to maximize nutritional value, and make a smoothie that supports major health pillars we all need—loaded with key macronutrients for balance and glycemic stability to help your body feel its best.

Get a $25 credit toward a Function membership with purchase. First-time members only.

Claim now
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Turns out science tastes good.

This is a nutrient-dense smoothie, formulated to deliver key micronutrients + metabolic stability.

Key micronutrients
Key micronutrients

Essential minerals and vitamins–like magnesium and vitamins A, C, K, E, and B–support immune and nervous system health.

Balanced macros
Balanced macros

High-quality protein with leucine helps maintain muscle and keep you feeling full, while omega-3 fats support metabolic health and a healthy inflammatory response.

Glucose index
Glucose index

Low sugar and low glycemic load, combined with high fiber and balanced fat and protein, help slow glucose absorption and promote steady energy.

Testing is easy

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160+ lab tests

Schedule at 2k+ Quest Diagnostics locations
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Results explained

By top doctors and 1000s of hours of research
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Follow your plan

Take action. Test again.

100+ lab tests chosen by top doctors

“The most powerful approach I’ve seen in my career. Uncompromising depth with no shortcuts.”

Mark Hyman, M.D.
Mark Hyman, M.D.
Former Cleveland Clinic physician

Hormones
& thyroid

16 Biomarkers
Thyroxine (T4) Free
Thyroglobulin Antibodies (TgAb)
Testosterone, Total
Anti-Mullerian Hormone
Estradiol

Cancer & other
silent risks

34 Biomarkers
GRAIL Cancer Test
Prostate Specific Antigen (PSA), Total
Rheumatoid Factor (RF)
Mercury
Lead

Heart
& metabolic

18 Biomarkers
LDL Small
Lipoprotein (a)
Apolipoprotein B (ApoB)
Omega-3 Total
Insulin
Omega-6 Total

Aging

26 Biomarkers
Sex Hormone Binding Globulin (SHBG)
DHEA-Sulfate
Insulin-like Growth Factor (IGF-1)
Homocysteine
Vitamin D
Platelet Count

Mental health
& focus

36 Biomarkers
Cortisol
High-Sensitivity C-Reactive Protein (hs-CRP)
Iron
Ferritin
Methylmalonic Acid (MMA) (B12 Proxy)
MTHFR, DNA

+More

All-in-one
lab testing

See all tests

Real people. Real results.

Function like Emeline
The silent threat of mercury toxicity
Function like Fernando
The deeper issue beneath my fatigue
Function like Holly
Finally finding the source of fatigue
Function like Alan
From diabetes diagnosis to action

Not your average checkup

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 GRAIL Cancer Test

Access to Alzheimers & brain testing

Access to mold reactivity testing

Standard checkup

What could cost you $15,000 is $340

Your health shouldn’t depend on insurance.
HSA/FSA Eligible

Function membership

<$1

/day
$340 for first-year memberships, charged annually
Join Function
160+ lab tests annually
Testing 2x/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 advanced MRI and CT scans anytime
No insurance, transparent pricing
Join Function

This is the most comprehensive lab testing I have ever had. I am thrilled to know more about my health and how to improve it.

Best money I have spent on healthcare.

Function blows my mind. The experience, price, and clinician notes are all phenomenal.

160+ lab tests and whole-body insights
$365
$340
$25 credit
With access and gift code

EREWHONSMOOTHIE

Checkout

Frequently asked questions

Which tests are included with a Function membership?

Membership includes 100+ lab tests across every major organ system—selected by the world’s top doctors to monitor for thousands of diseases. And 60+ tests halfway through the year to see what’s changed. Hormones, heart, thyroid, nutrients, metals, metabolism, autoimmunity, liver, and inflammation—what others skip, we don’t. If it impacts your future, we test it.

Advanced Add-Ons like Galleri and MRI and CT scans are available for an additional cost. See the full list of tests.

Is Function FSA/HSA eligible?

Yes—check with your plan to confirm eligibility. Members receive an itemized receipt to submit for reimbursement.

Why are we called "Function"?

Your body, mind, and healthcare system should function. But corrupted food systems, chronic stress, and outdated practices can push you toward dysfunction. We exist to change that. We give you insights across your body—heart, hormones, thyroid, nutrients, toxins, inflammation, and more—so you can stay in control.

Is the smoothie available at all Erewhon locations?

The smoothie is available in all Los Angeles Erewhon locations.