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How does Zest Work?

Test at home & change what matters
One score to reveal how your brain and body are aging, plus a detailed performance breakdown and personalized protocol to extend your healthy lifespan.
Start the Quiz

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It’s as easy as...

Test, Track & Optimize.

Test
Functional Age
Easy sample collection & in-app assessments, accessible from your own home. We measure biomarkers from all body systems to gain a holistic picture of your body's age on the inside.
Blood Biomarkers
Digital Biomarkers
Functional Biomarkers
Track
Biomarkers that matter
Track the health of your brain and body based on key longevity biomarkers. We use bespoke Zest reference ranges developed after 2+ years of longevity research, because normal is not the same as optimal.
Optimize
Your Healthy Lifespan
Receive a longevity protocol personalized to your biology. Target improvement in metrics linked to your health and longevity. Discover supplement & lifestyle recommendations based on your results.
Actionable results

“74% of users improve Functional Age within 3 months”

How Zest works

Step 1:
Receive your home age test in the mail.
Step 2:
Do a finger-prick blood test and send it to our lab.
Step 3:
Receive results in our app within 1-2 weeks.
Step 4:
Optimize with supplements based on your results

Why Choose Zest

Increased energy
Reduces stress
Better sleep
Increased metabolism
Better memory
Slower aging
Look younger
Improved cognition
Feel better now and in the future

Control your health and feel the benefits.

Improving functional performance now will immediately improve your quality of life. Preventing age related diseases and living healthier is an added bonus for future-you.
Embrace you aging journey

Aging doesn’t have to be scary

Whether it’s your cognitive performance or physical health, knowing your baseline and tracking progress is the first step to taking back control.
Forge your own path

For the first time, ever the science exists to make change

We don’t need to follow the same physically and emotionally draining path of previous generations. The science now exists to allow us to live better for longer.
Your connection to the latest research

We do the research, so you don’t have to.

Our team of medical physicians and longevity scientists stay at the forefront of the latest research. We keep up to date with rapidly evolving longevity science, and deliver it directly to your mobile device in our longevity news tab.

We are committed to advancing healthcare through personalized scientific research

We believe health is personal. That’s why our research includes people of all ethnicities and backgrounds.  Health optimization should work for everyone. We’re replacing ‘one-size-fits-all’ advice with truly personalized insights, designed for your unique biology.
&
Zest is proud to partner with the University of Cambridge Memory Lab to detect and prevent cognitive decline in mid-life. Zest’s Functional Age test assesses cognitive performance through Sequence Memory, Digit Span Memory, and Precision Memory tests in our app. These scores play a crucial role in calculating Functional Age while also helping to validate clinical models of memory processing ensuring they can be effectively applied in public health settings.
Participation in research studies is entirely optional, and we will always seek your explicit consent before using your data for research. We never sell personal data and strictly adhere to HIPAA regulations to safeguard your information with the highest standards of security and confidentiality.

As seen on:

Image of a longevity daily supplement pack
Image of a longevity daily supplement pack
Image of a longevity blood test package from Zest
Image of a longevity blood test package from Zest
Image of a daily longevity supplement pack

Join our community

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More than 10,000+ people have Joined Zest and unlocked their personalized pro-longevity plans. Get started with Zest today!

GET STARTED

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?

Contact Us