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142 reviews

Functional Age Test Kit

US
US$199.00
US$199.00
/ each
/ month
/ each
US$289.00
/mo
Targeted longevity therapeutics
Longevity Panel
View results in app
  • At-home age testing kit.

  • Personal dashboard to view results & track progress in our app.

  • Breakdown of the 25 key biomarkers impacting your aging.

Optimize your aging with the only biological age test created by doctors. Zest examines aging across multiple body systems, offering insights into your metabolic health, cardiovascular function, cognitive performance, and physical fitness. 

 

Pair your blood test results with your digital data through the Zest app to see which lifestyle changes are making an impact. Track key biomarkers and take control of your health—your best years are yet to come. 

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Vitamin D3
Vitamin K2
Ca-AKG
Omega 3
Fisetin
Spermidine
Magnesium
Hyaluronic Acid
Berberine
Pterostilbene
Glycine
NAC
TMG
NMN
What's included:

Caps per bottle: 30

MG per cap: 500mg NMN & 500mg TMG

Item form: Acid Resistant Capsule

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1 Bottle
3 Bottles - Save 20%
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Purchase Two Tests and Save 20%
One Test $199
Two Tests $398 $318
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$279
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QUALITY
INGREDIENTS
GMP
CERTIFIED
PHYSICIAN
FORMULATED
3RD-PARTY
TESTED
SUGAR &
GLUTEN-FREE
VEGAN &
ALL NATURAL
INSULIN
SENSITIVITY
BIOLOGICAL
AGE
MEMORY
METABOLISM
ENERGY
How does the test work?
  1. Zest will deliver a test kit to your door. We provide instructions on how to take a finger-prick blood sample and send this back to our lab in the pre-paid envelope. 
  2. Download the Zest app and create your account.
  3. Test cognitive and functional performance in app. 
  4. Our lab will send your test results to your app, showing you the blood biomarkers that are impacting your rate of aging and where to improve.
  5. Zest will incorporate this digital and functional data, alongside your blood test data to give you a measure of your Functional Age, accurate to within 2 years. .
How will my results help me?
  1. Your Functional Age score will establish how well each of your body’s systems (cardiac, joints, kidney, liver and brain) are aging.
  2. Once we know this, the Zest App will provide tailored recommendations for you to improve this score and slow your rate of aging. 
  3. Recommendations will include, exercise targets, brain exercises, sleep improvements, supplement protocols and more to unlock a healthier lifestyle.
How often should I test?
  1. The Zest Functional Age score can be improved within three months, due to the incorporation of our functional and digital biomarkers. 
  2. No other test on the market is this sensitive. 
  3. We recommend testing, implementing lifestyle changes for 6 months and then testing again to see the improvement.
What countries do you ship to?

The Zest app is downloadable from all countries. Currently our blood tests and supplement packs are currently only available in the USA and Canada.

Zest Longevity Panel
Biomarkers

This test is comprised of the 9 biomarkers which have been shown repeatedly in the literature to be the most closely linked to health span and lifespan.

Using the results of this blood test alone, we can predict age to within 5 years of accuracy. When you combine these blood test results with digital and functional biomarkers through our app, the accuracy improves to within 1 year of a user’s chronological age, making it one of the most accurate biological clocks on the market. The field of longevity is rapidly evolving, and we are committed to adapting our panel based on new developments in the research (hence our recent addition of ApoB to the panel).

Biomarkers included in panel:
LDL
Blood
Chemical symbol for LDL's

LDL (low-density lipoprotein) cholesterol is another type ofblood lipid. High amounts of LDL cholesterol can significantly increase your risk of developing cardiovascular disease, dementia, and other chronic conditions.

CRP
Digital
Chemical symbol for LDL's

hsCRP is a high-sensitivity test for C-reactive protein (CRP), a protein that is elevated in states of inflammation. Increased levels of CRP correlate with an increased risk of cardiovascular disease, diabetes, kidney disease, and dementia.

Albumin
Functional
Albumin chemical symbol in green

Albumin is a blood protein that plays a crucial role transporting compounds around our body and helping to control blood pressure and pH. Albumin levels show how well your liver and kidneys are functioning. Low levels correlate with age and an increased risk of all-cause mortality.

ApoB
Blood
Chemical symbol for APOB in green and yellow

Apolipoprotein B-100 is a protein that helps carry fat and cholesterol through your body. It is a new and improved way of measuring cardiovascular risk and is thought to be a better predictor than LDL cholesterol levels, particularly for younger people. It is a newly popular biomarker which we have recently added to our panel as we strive to remain at the leading edge of longevity research.

Triglycerides
Blood
Chemical symbol for triglycerides

Triglycerides are a type of lipid found in the bloodstream. They are used as a source of energy, but high levels are harmful for your health. High triglyceride levels significantly increases risk of developing cardiovascular disease and diabetes, which are both linked to shorter lifespan and healthspan.

HDL
Blood
chemical symbol for HDL's

Cholesterol is a blood lipid (or fat) that is crucial for energyproduction and transport. HDL (high-density lipoprotein) cholesterol is a form that is generally beneficial to your health and longevity. High HDL levels will reduce your chances of developing chronic diseases including cancer, diabetes, cardiovascular disease, and dementia.

HbA1c
Blood
Chemical symbol for HbA!c

HbA1c is a longer term blood glucose level. It measures the amount of glucose bound to red blood cells in your circulation. Since the lifespan of a red blood cell is around 3 months, it gives us a snapshot of what your blood glucose levels have been like across the past 3 months. Higher values of HbA1c increase the risk of diabetes, cardiovascular disease and death of any cause.

Fasting glucose level
Blood
Chemical symbol for glucose

Fasting blood glucose is a measure of how much glucose - the main compound the body uses for energy - is present in your blood when you have been fasting for at least 8 hours. High blood glucose increases your risk of diabetes, cardiovascular disease, cognitive decline, and other age-related diseases.

Oestradiol
(Female only)
Blood
Chemical symbol for oestradiol

Oestradiol is the primary form of the major female sex hormone oestrogen. Oestradiol levels begin to decline around the onset menopause, which can result in bone weakness and decline in reproductive health. Low oestradiol levels can reduce your bone density and cause unpleasant symptoms such as hot flushes and mood swings, as well as increase the risk of cognitive dysfunction.

DHEAS
(Female only)
Blood
Chemical symbol for DHEAS

DHEAS (dehydroepiandrosterone sulfate) is the compound that the body uses to make testosterone and oestradiol, making it crucial for sexual function as well as bone, muscle and reproductive health. DHEAS levels naturally decrease with age which can cause fatigue, mood swings, and sexual or reproductive dysfunction. Low levels of DHEAS increase your risk of osteoporosis, stroke, cardiovascular disease, and cognitive dysfunction.

Testosterone
(Male only)
Blood
Chemical symbol for testosterone

Free testosterone is a measure of how much testosterone is circulating in the blood and able to act on your organs. Free testosterone levels naturally decrease with age, causing bone and muscle weakness, low libido, mood disorders, and increased risk of metabolic syndrome. Maintaining high testosterone levels is a powerful way to combat aging and lengthen your healthspan.

SHBG
(Male only)
Blood
Chemical Symbol for SHBG

SHBG (sex hormone-binding globulin) is a protein that binds to testosterone and other sex hormones in the blood, thereby helping to regulate their levels. In males, SHBG levels naturally rise with age, meaning less available testosterone and other sex hormones, causing bone and muscle weakness, low libido, and mood disorders. High SHBG levels have also been linked to an increased risk of Alzheimer’s disease.

Whats included in the Membership?
  • Your chosen longevity supplement stack, delivered monthly.
  • Zest longevity blood panel delivered every 3 months. This is an at-home finger-prick blood test consisting of the 9 blood biomarkers most closely linked to healthspan and lifespan.
  • Access to the Zest app.
  • Zest biological age calculation (coming soon).
What countries do you ship to?

The Zest app is downloadable from all countries. Currently our blood tests and supplement packs are currently only available in the USA and Canada.

Why is the Zest Membership better?

Tally Health Complete Membership
Novos Longevity Kit
Elysium Starter Pack
GlycanAge Testing Subscription
Humanity Health App
Tracking App
At Home Blood Testing
Every 6 months
Yearly
Yearly
NMN Daily Dose
250mg
250mg
Split Dosage Packs
Water Soluble and Fat Soluble
Supplement Active Ingredients
4.45 grams
6.9 grams
2.95 grams
Membership Unit Price
(per Month)
$54.49/g
$23.23/g
(½ the NMN of Zest)
76.27
(No NMN)

Zest is your one stop shop and the only fully comprehensive longevity program incorporating supplements, testing and lifestyle tracking for the best price.

Pay 23 cents more per month for 2x the amount of NMN compared to Novos.

Scattered pills on black background
Supplements on a black background

What are the benefits of each supplement?

benefits

Learn about the benefits of each ingredient below, turn on ‘Geek Mode’ to get technical.

Zest Supplements on a background with lemons and foliage

Why combine NMN & TMG

NMN has been proven to provide anti-aging benefits by enhancing the function of common proteins (Sirtuins and PARPS), through NAD+ production.

NMN is clinically proven to improve: 

  • Energy production in mitochondria
  • Oxidative stress
  • DNA damage
  • Cognitive impairement
  • Inflammatory conditions


TMG has been approved by the FDA to lower homocysteine in our blood plasma which can help fight off cardiovascular issues.

NMN & TMG work together as NMN-induced NAD+ production requires the use of the methylation process, supported by TMG. TMG is known as a  methyl group donor. NMN and TMG together offer one of the best ways to activate and support the healthy function of our internal anti-aging processes.

Essentials blend bottle on a blue background

What is NMN?

NMN (Nicotinamide mononucleotide) stands as the hero of longevity supplements.  Derived from niacin (Vitamin B3),  NMN helps to boost NAD+ in your cells. This can lead to a boost in your cellular energy levels,  improved cognitive health for a sharper mind, improved cardiovascular health through better vascular function, and an improved metabolism.

Zest’s Pure NMN Capsules use Enteric Coated Acid-Resistant non-GMO capsules that are designed to resist stomach acids and absorb in the small intestine, improving the bioavailability of the NMN by 30% compared to regular capsules.

What are the effects?

NMN and in turn NAD+  affect energy levels, sleep quality, mental focus, fatigue levels and metabolism, to slow your rate of aging.

Essentials Blend bottle on a yellow and white background

What is TMG?

TMG, or Trimethylglycine, is a compound derived from beets and other plants. Also known as betaine, TMG plays a role in supporting methylation processes in the body. It is often included in supplements for its potential benefits in promoting liver health, cardiovascular function, and overall cellular methylation.

Trimethylglycine operates in the body as a methyl donor for various crucial biological processes. By donating methyl groups, TMG supplements aids the conversion of homocysteine to methionine, contributing to a balanced methylation cycle.  It also ensures supplements the use up methyl groups (such as NMN) can work effectively.

What are the effects?

TMG improves the efficiency of NMN supplements, and acts to improve mood, detoxification in the liver, reduce joint inflammation and promote muscle development.

Scattered pills on black background
Supplements on a black background

What are the benefits of each supplement?

benefits

Learn about the benefits of each ingredient below, turn on ‘Geek Mode’ to get technical.

Why are Zest Supplements better?

7.2 g of actives included every day, more than any other longevity company on the market. 

Tally Health Essential Stack
Infiniwell Longevity + Pack
Elysium Starter Pack
Verso
Amount of Actives
4400.9 mg
3180 mg
2920 mg
640 mg
Split dosages into Water soluble and Fat soluble 
3d Party Lab-Tested NMN Purity Reports
Not included
NMN Daily Dose
Not included
200mg
250mg
250mg
Omega 3 Fish Oil
Refrigerated to minimize oxidation
Not included
Not included
Not included
Not included
Price
$210
= 5c per mg
$259.95
= 8c per mg
$270
= 9c per mg
$60
= 9c per mg

What to look for in an age test?

Zest Functional Age Test
Other Biological Age Test
Measure Cognitive Function
Measure Cardiovascular Performance
Measure Functional Fitness
Track digital data from your wearable device
Compare your biomarkers to a sample greater than 300,000 people
Ability to re-test and track improvements

Why did we build Functional Age?

Many tests take a single proxy for biological age (Inflammation age, DNA methylation etc.) However, these tests were not designed to give insight into an individuals personal longevity, but for research purposes, predominantly in animal models.

Imagine a scenario where an individual in their 60’s receives an age score in their 20’s. The data is not actionable nor does it provide insight on how to improve your healthy lifespan.

Epigenetic clocks can’t actually tell you much about your own health. That’s because they were designed to assess large groups of people, not individuals. Consequently, their results can be unreliable. (NY Times 2024.)

To tackle this problem Zest has created the only multifaceted age testing system, from the ground up, Functional Age.  We benchmark the biomarkers linked to aging and pull data from your blood, wearable device, and functional performance tests. Then provide analysis that is actionable and relevant to the individual taking the test, not the mouse or yeast trial that other common tests were developed for.

If you have excellent blood biomarkers, but warning signs present in your cognitive performance, Zest will detect it, rather than telling you that you are fit to live to 120. Giving you the necessary information to optimize this area and create a truly personalized action plan for your aging journey. 

What others 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
"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

Did you know..

Blood Tests can predict your age with incredible accuracy?

Our blood test is comprised of the 10 markers which have been shown repeatedly to be the most closely linked to healthspan and lifespan.

Want to learn more?

Explore every biomarker below in detail.
Fingers taking a blood sample with a lancet
LDL
Blood
Chemical symbol for LDL's
CRP
Blood
Chemical symbol for LDL's
Albumin
Blood
Albumin chemical symbol in green
ApoB
Blood
Chemical symbol for APOB in green and yellow
Triglycerides
Blood
Chemical symbol for triglycerides
HDL
Blood
chemical symbol for HDL's
HbA1c
Blood
Chemical symbol for HbA!c
Fasting glucose level
Blood
Chemical symbol for glucose
Oestradiol
(Female only)
Blood
Chemical symbol for oestradiol
DHEAS
(Female only)
Blood
Chemical symbol for DHEAS
Testosterone
(Male only)
Blood
Chemical symbol for testosterone
SHBG
(Male only)
Blood
Chemical Symbol for SHBG

Which supplement is right for me?

Reduce stress
Better sleep
Slower aging
Increased metabolism
Look younger
Improved cognition
Better memory
Increased energy
Benefit
Core
Plus
Unlimited
Slow Rate of Aging
Improved Sleep
Enhance Cognitive function
Improve Mood
Boost Energy Levels
Improve Skin Health
Regulate Metabolism
Cardiovascular Health
Joints, Bones & Flexibility
Looking Younger
SUPPLEMENTS

Your Pro-Longevity Routine.
Delivered to your door.

Delivered

Zest Science's science-backed approach harnesses your body's natural mechanisms to promote a longer, healthier life.

We’ve curated clinical grade ingredients and the most holistic biological age test on the market using methodologies backed by decades of research and real clinical experience.

BLOOD 
TESTING 
QUALITY
INGREDIENTS
GMP
CERTIFIED
TEST 30
BIOMARKERS

Frequently Asked Questions

  1. Order your functional age test via our website
  2. Receive your at-home finger prick blood test kit, collect your dried blood sample and send it off in the prepaid mailer.
  3. Download our app and receive your blood test results directly to your phone, no need for any follow-up results appointments
  4. Repeat steps 6 & 7 until you find the perfect and most optimized longevity protocol for you, and then use the app to stay accountable.
  5. Download our app and select a membership that works for you. 
  6. Start following our science-backed longevity protocol.
  7. Watch your functional age score come down, continue adding the new recommendations to your daily protocol, and iterate towards a lower biological age over time.
  • Your chosen longevity supplement stack, delivered monthly.
  • Zest longevity blood panel delivered every 3 months. This is an at-home finger-prick blood test consisting of the 9 blood biomarkers most closely linked to healthspan and lifespan.
  • Access to the Zest app.
  • Zest biological age calculation (coming soon).

The supplement subscription only includes supplements and app access, no blood tests. Without the blood biomarkers, we are unable to calculate biological age.

Mainstream supplements are typically designed to augment ingredients which you could regularly find in your diet to help you meet your daily recommendations. Longevity molecules are different because:

1) you don’t find any of these ingredients in your regular diet and
2) there are no established daily recommendations of these ingredients.

These ingredients have come out of recent cutting-edge research on how to biologically slow the aging process. There aren’t any government guidelines recommending certain levels of these ingredients to promote health, since they are so new and they target the aging process as a whole rather than focusing on a specific disease. Our ingredients cannot be found in most supermarkets or drug stores.

  • At 7.2 g grams per dose, we have the highest amount of pure active ingredients of any other longevity company on the market, so you’re actually getting therapeutic doses that make a difference.
  • We have the purest and highest quality ingredients, and provide purity reports and 3rd party Lab Testing as well as sourcing information for all ingredients.
  • We don’t mess around with vitamin gummies, green juice blends, or other influencer fads which aren’t backed by science. We only supply the real deal, high quality and therapeutic doses backed by 100+ clinical trials.
  • We separate our supplement packs into hydrophobic and hydrophilic to optimize absorption and reduce gastrointestinal upset. This means the ingredients are actually getting into your cells, unlike for many multivitamin companies which just cause you to make expensive pee.
  • We have expertly curated our supplement stacks to target all 12 root causes of aging, making you biologically younger on the inside.

Zest’s functional age calculation is the most accurate and holistic biological age score on the market, and the only one which takes into account your cognitive function as well as your physical health. We use a combination of blood biomarkers, digital biomarkers and functional biomarkers (including memory tests) which we run through our machine learning algorithm to give you the most accurate and research-backed biological age measurement yet. Our blood test includes markers for your cholesterol levels, hormone levels, liver enzymes, and other tests grounded in 100+ years of research (the OG science, not just the latest fads). We then add this to our digital biomarkers such as resting heart rate, sleep, mood, VO2 max score, and other metrics which give real insight into your day to day functionality. Finally we include grip strength and some cognitive tests as part of our “functional biomarkers” and together this makes up the data that goes into our functional age algorithm to give you a result for your biological age.

At Zest, we want to make longevity easy. We have a team of medical doctors and longevity scientists constantly examining the latest literature to determine which ingredients should go into the ultimate life-extending supplement stack. We continuously update these packs as new research emerges to ensure the ingredients you’re taking are at the forefront of medical and scientific research. No need to spend hours doing your own research, we are the experts and we have you covered! Just subscribe to the membership and Zest takes care of the rest.

The Zest app is downloadable from all countries. Currently our blood tests and supplement packs are currently only available in the USA and Canada.

Still have a questions?

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

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Image of the Zest blood testing kit on a white backgroundYellow Icon with the text "30 day supply of longevity supplements free"
Zest Functional Age test
At home blood test to determine your age on the inside
$289 $199
Longevity supplement starter pack
Includes: 30 Day supply of NMN & TMG
$80 Free
Total
$359 $199
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Image of a longevity daily supplement pack
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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!

Functional Age Test Kit