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Test

  • Discover your starting point
  • Through testing Functional Age with an at home blood test
Zest's functional age test image
Get started

Track

  • Develop a personalized longevity routine.
  • Free App to suggest lifestyle modifications.
  • Ensure your protocol is ACTUALLY working by syncing your daily health data.
Zest app home screen on mobile device
Get started

Optimise with supplements

  • Supplement with longevity molecules.
  • Take the ingredients right for you.
  • Slow your rate of aging. 
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Get started

Test

Discover your starting point through testing Functional Age with an at home blood test

Starting at
$179
/month
SHOP NOW

Track

Develop a personalized longevity routine with our App's lifestyle suggestions.

Starting at
FREE
SHOP NOW

Optimize

Curated supplement packs, Zest app access to help slow your rate of aging.

Starting at
$149
/month
SHOP NOW

Functional Age Metrics

Sequence Memory
Digit Span Memory
Blood Biomarkers
Digital Biomarkers
Cognitive Performance
Physical Performance

What Zest users are saying

"Great to see an age test that covers more than one body system. I was shocked to see my cognitive performance needs to improve!"
Initials P and D of a zest user
Peter Dylan,
Chicago, IL
"Zest is the easiest longevity solution I have found. Informative, clear information, that isn't overly expensive."
Initials G and S of a zest user
Glenda Short,
Rochester, NY
"At my age, staying healthy is a priority, but it can be overwhelming. Zest has simplified everything. It's comforting to know that these technologies exist"
Initials A and P of a zest user
Alan Peterson,
‍Dallas, TX
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"I recently tried Zest's functional age test, and I'm thoroughly impressed. The process was straightforward, and the insights I gained into my biological age were eye-opening. The combination of the home blood test, digital biomarkers from my wearable device, and the functional performance tests provided a comprehensive view of my health."
Initials A & H of a zest user
Alison Holmes,
Boston, MS
"As a woman in my 60s, I found Zest's functional age test easy to use and incredibly insightful. The results gave me a clear understanding of my health, and the personalized advice has helped me make positive changes. I now feel more in control of my aging process, thanks to Zest."
Initials L & S of a zest user
Lisa Sulivan,
Nashville, TN
"Zest's functional age test was exactly what I needed. The process was quick, and the insights were spot on. The supplements they recommended have seamlessly fit into my busy lifestyle, helping me feel more energized and proactive about my health."
Initials L & S of a zest user
Abishek Singh,
Queens, NY

How Functional Age Testing Works

Smart phone app, three screens overlayed across each other.
GET STARTED

Ready to See Your Functional Age?

FREE
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Age testing is the first step in a successful longevity routine. Test your starting point, track  performance, then optimize with targeted supplements.
Understand your body’s true age and get actionable insights to feel younger and healthier.

Get Started
Zest app home screen on mobile device

Frequently Asked Questions

Your kit includes everything you need to collect a small blood sample at home, safely and easily. Inside you’ll find a lancet, collection cards, alcohol swabs, bandages, and a pre-paid return envelope. No lab visits, no hassle.

Once your blood sample is returned, we analyze key biomarkers linked to aging and combine them with data from your wearable devices and in-app functional performance tests. Our machine learning algorithm calculates your Functional Age a snapshot of how old your body really is compared to your chronological age. We also provide a peronsalized protocol for you to improve your scores.

Zest blood tests anlayze clinically relevant blood biomarkers including:
‍
‍Inflammation: CRP
‍Metabolic health: HbA1c, fasting glucose, triglycerides
‍Cardiovascular risk: LDL, HDL, ApoB
‍Liver & protein status: Albumin
‍Hormones (for men & women): Testosterone, Oestradiol, SHBG, DHEAS

We recommend retesting every 3 to track your progress, assess what’s working, and update your personalized protocol. Functional age is dynamic, and improvements are often visible within just a few months of following your plan.

All of your results, scores, and recommendations are delivered in the Zest app. You’ll get a breakdown of your Functional Age, biomarker analysis, and a tailored plan covering supplements, training, recovery, nutrition, and sleep.

Zest offers targeted longevity supplements designed to support the areas that impact your biological age the most, such as cellular energy, inflammation, brain health, and hormone balance. Your personalized protocol will recommend the right supplements based on your test results.

Still have a questions?

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