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Fix your low energy
Diagnostic testing, clinicians, and AI working together to help you understand your low energy and how to fix it.
Low energy manifests in different ways
Low energy isn't just something you have to live with. It's your body telling you something isn't right, even if your bloods came back 'normal’.
The 3pm crash, every day
Coffee just to stay upright
Flat, even when nothing's wrong
Not feeling like yourself any more
Frequent anxiety and worry
Our members shifted from guesswork to clarity
"My energy was low and my hands and nose were always cold for years. I thought it was just me. Calibre tested my leptin, a hormone the NHS doesn't measure, and traced the pattern back to a hormonal imbalance. They gave me specific strategies. The mystery was solved."
Faheem
,
36
Business Owner
"
We built Calibre because we needed it ourselves"
— Alex, founder and CEO
I grew up knowing I'd inherited a genetic risk for heart disease. Regular blood tests from childhood, low-dose medication from 18. I never really understood why.
Then in 2019, at the peak of a demanding job, my energy tanked. The tools that had worked for a decade stopped working. My uncle died unexpectedly and my parents were aging quickly. I was struggling with the present and worried about the future. Then I met Dr Reinhold.
He had a unique approach I had never seen from a doctor before. He looked at my full picture, from my sleep, my food, my stress, my bloods, my genetic risks and more. He explained what I'd inherited, how it was showing up in my markers, what I could actually do about it, and what was outside my control. He also clearly showed me why my energy was tanking, and what my levers were to get back on track.
Within six months, my energy was back. Within twelve months, every modifiable long-term risk marker for my cardiovascular risk (triglycerides, ApoB, blood pressure to name a few) was in the optimal zone. For the first time, I understood what was happening in my body, why and exactly what I could do about it.
That's the level of proactive and holistic care we built Calibre to give people.
How we compare
Coffee, supplements, another sleep gadget. They mask the symptoms. Calibre finds the cause.
Got more questions?
Talk to us
If you'd rather speak with someone before joining, book a 15-minute call with a member of our team.
Built by world-class experts
Dr Reinhold Innerhofer
Chief Medical Officer
Former elite sports scientist and clinician behind Calibre’s methodology, combining diagnostics, data, and preventive medicine.
Dr Samantha Field
First Clinician
Consultant in Public Health with experience spanning the NHS, government, international health organisations, and academia.
Dr Priyesh Parekh
Clinician
Specialising in cardiology diagnostics and preventative care, with experience across NHS practice, Neko Health, and the BMA
Advisor
Dr Michelle Griffin
Obstetrician & Gynaecologist
Leading women’s health expert spanning the NHS, Public Health England, the WHO, Cancer Research UK, and founder of MFG Health.
Advisor
Dr Christoph Binder, PhD
Professor of Atherosclerosis Research, University of Vienna
Leading cardiovascular researcher with over 140 publications, including Nature and Nature Medicine, specialising in atherosclerosis.
Advisor
Dr Harald Esterbauer, PhD
Head of Genetics, University of Vienna
Genetics researcher leading the clinical genetics laboratory at the Medical University of Vienna, with landmark work on obesity and insulin resistance
Advisor
Dr Moritz Plieger
General Practitioner & Vitality Researcher
Researcher focused on endocrinology, neuroscience, and pharmacology, contributing to Calibre’s causal model of energy and vitality.
Frequently asked questions
I've already tried Thriva or Neko. How is Calibre different?
Those services give you data. Calibre is designed to deliver outcomes. That’s why we have personalised blood tests, and assess your lifestyle, health history and wearable data in order to build the complete picture of your health. This is joined up and reviewed by a dedicated doctor who provides you with a holistic health assessment and then builds a plan around the 2 to 3 specific things actually driving your energy and long-term health. Not another dashboard to decode alone.
What if I've already tried more sleep, less caffeine, and supplements?
You're not alone. Most Calibre members have already tried what generic advice recommends. That's why we don't start with generic advice. We start with your specific context and data, find what's actually driving your energy, and build a plan around the 2 to 3 things that matter for your body. The cause of low energy often differs from person to person.
How long until I feel a difference?
Most members report noticeable improvements within 4 to 8 weeks. Meaningful change in your biomarkers typically shows in the first re-test at month 6. Your Energy Score is remeasured every quarter so you can see progress objectively, not just how you feel on any given day. Results may vary and will also depend on you implementing the plan.
Do I need to give up coffee, alcohol, or my current routine?
Maybe. Calibre isn't a restrictive protocol. Your dedicated clinician looks at what you're currently doing and identifies the specific changes that will move your energy for your body. Often it's not what people expect. One member's energy improved by swapping white rice for sweet potatoes. Another's by reducing high intensity cardio. We will show you the full picture and provide you with different choices on how to improve your energy.
What if my results indicate something serious?
Your dedicated doctor reviews every result. If anything requires urgent attention or specialist input, we'll flag it immediately and provide a GP referral letter for onward care. Calibre works alongside NHS care, and is not a replacement for primary or acute care.
Where do I get my blood drawn?
We partner with clinics across London, giving you a choice of locations and flexible appointment slots.
Why £39 a month? What's included?
Everything. Your 50+ biomarker panel, your dedicated doctor, quarterly reviews, five days of lifestyle tracking every quarter, wearable integration, your Calibre Energy Score, your personalised plan, advanced testing where indicated (DEXA, VO₂ max, CGM, hormone panels). No upsells. No supplement commissions. Comparable care assembled separately would cost around £5,000 a year.
My GP said my bloods are normal. Can Calibre still help?
Yes. Standard NHS panels are designed to detect disease, not to identify what's driving your energy or what’s optimal for you. Being within reference range doesn't mean your body is running at its best. Calibre tests specific markers most GPs don't run, including leptin, fasting insulin, Free T3, ApoB, and interprets them in the context of your full picture, so we can find what's driving your energy even when your bloods look fine.
Can I pause or cancel my membership after I sign up?
Yes to both. If you need to pause or cancel your membership for any reason, just reach out to us via WhatsApp, and we'll sort it out.
Is my data secure, and how is it handled?
We are privacy-first by design, and our data practices are built to meet the latest UK data protection and GDPR standards. We follow CQC-regulated policies that apply to UK clinical care providers.
Your health data is only accessible to you and your clinical team. It is not shared beyond that without your explicit consent, except where legally required.
See our privacy policy or email us at privacy@getcalibre.com.
