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Functional Age Metrics
Realise your health goals
Extend Fertility
Your lifestyle impacts everything from libido to fertility. Zest tracks and detects hormone imbalances early. A personalized protocol supports healthy hormone levels, giving your body the best chance for natural conception and reproductive health.
Target Longevity
Through detailed tracking of inflammation, cardiovascular, and cellular aging markers and with targeted supplements like NMN, you can extend both your lifespan and the number of healthy, active years you enjoy.
Controlled Weight Loss
Improving metabolism , makes it easier to lose fat and maintain lean muscle. By tracking metabolic biomarkers like fasting glucose and insulin resistance, and optimizing nutrition and training, Zest helps you unlock a younger, fitter body.
Sharper Cognitive Health
Cognitive aging starts decades before we notice memory loss. By monitoring cognitive performance, Zest helps identify what’s dulling your thinking. With science-backed interventions and lifestyle tweaks, you can sharpen your mind and beat brain fog.
Better Sleep
Sleep is a core pillar of biological age. By tracking wearable data and hormone levels like cortisol and melatonin patterns, Zest helps you uncover what’s disrupting your rest—and gives you science-based strategies to sleep deeper, longer, and better.
Improved Metabolic Health
Tracking biomarkers like HbA1c, triglycerides, and CRP allows Zest to catch early signs of metabolic dysfunction. By reversing functional age, your body becomes more efficient at managing blood sugar and inflammation—two key drivers of chronic disease.
Prevent Chronic Disease
Identifying issues years before symptoms appear, Zest gives you the tools to take control of your long-term health. Participants reduce risk of age-related diseases like heart disease, diabetes, and cognitive decline
Fitness & Recovery
Zest combines physical test data (like grip strength and VO2 max) with blood markers to build a training and recovery protocol tailored to your biology—so you bounce back faster and perform better.
How Functional Age Testing Works
Ready to See Your Functional Age?
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.
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.