See what your food does to you.
A coin-sized sensor on the back of your arm reads your glucose every five minutes for two weeks. Paired with Vitality Tracker, it shows you how your own body answers your own meals, fasts, training and nights, which is the one thing a diet book cannot know. No diabetes required.
A sensor on your arm, a reading every five minutes.
A continuous glucose monitor is a small sensor you wear on the back of your upper arm. Under the adhesive patch is a soft, flexible filament thinner than a hair that sits a few millimeters into the tissue under your skin and measures glucose in the fluid there, every five minutes, day and night, for 14 days. A transmitter the size of a 20-cent coin sends the readings to your phone by Bluetooth. There is no needle left in you, nothing to prick, nothing to calibrate, and after the first day most people forget it is there.
Until recently, sensors like this were used almost only by people with diabetes, because they were built for them. What changed is that the same instrument turns out to be the clearest window anyone has into their own metabolism, and the price fell to where a month of looking costs less than a pair of running shoes.
Less than you expect, and less than a finger prick.
The sensor comes in a spring-loaded applicator: you press it against your arm, hear a click, and it is on. Most people feel a brief press or a pinch that is gone in a second; some feel nothing. The filament is flexible, so it moves with you. You can shower, swim and train with it (the GS3 is rated for up to a meter of water for up to an hour), sleep on it, and forget it. Two honest caveats: the first night’s readings can run low if you lie on the sensor for a long time, which is a pressure effect rather than your blood sugar, and VT marks those stretches; and a small number of people get a red, itchy patch from the adhesive, which a barrier film under the sensor usually solves. When the 14 days are up, the sensor tells your phone, you peel it off like a bandage, and you put the next one on.
Because the number that matters most is not the one on a lab form once a year.
It is the shape of your glucose across a day, and that shape is yours alone.
A fasting glucose or an HbA1c is a snapshot or an average. What they cannot show is how high and how often your glucose rises after meals, and that is where change shows first. When Stanford researchers put sensors on people whose standard tests were normal, they found glucose spending about 15 percent of the time in the range that defines prediabetes and 2 percent in the diabetic range, in people no clinic would have called anything but healthy (Hall et al., PLoS Biology, 2018, 57 participants). The sensor sees what the once-a-year test averages away.
In the study that founded personalized nutrition, 800 adults wore sensors for a week and ate 46,898 meals, and the same food produced wildly different responses in different people: one person’s safe lunch was another person’s spike (Zeevi et al., Cell, 2015). A larger British study found the same in 1,002 adults including identical twins, with person-to-person variation in glucose responses of 68 percent (Berry et al., Nature Medicine, 2020). A diet written for everyone is written for no one in particular. A month with a sensor writes yours.
A sensor does not make you lose weight. What it shows is the mechanism behind the next snack: in 1,070 people, the dip in glucose two to three hours after a meal, the crash that follows a spike, predicted how hungry they were and how much they ate for the rest of the day better than the spike itself did (Wyatt et al., Nature Metabolism, 2021). Once you can see which of your breakfasts dip you at eleven, you can stop having them, and VT’s energy engine and Weight Loss Plan do the arithmetic that follows.
The sensor is the only instrument that watches you while you sleep and eat. Six nights of four hours’ sleep lowered glucose tolerance in healthy young men to a degree the authors compared with normal aging (Spiegel et al., The Lancet, 1999), and a dinner at ten instead of six raised overnight glucose and cut fat burning during sleep in healthy volunteers, most in the early sleepers (Gu et al., JCEM, 2020). With your sleep and your glucose on one chart, a late meal, a short night and a high morning stop being three separate mysteries.
In 10,232 adults followed for up to eight years, the relationship between HbA1c and mortality was continuous across the whole range, including in people without diabetes, with the lowest rates below 5 percent (Khaw et al., Annals of Internal Medicine, 2004). That is an association, not a promise, and no trial has yet shown that a person without diabetes lives longer for wearing a sensor. What the evidence does support is that glucose control is a dial, not a switch, that it moves with food, sleep, movement and stress, and that you cannot turn a dial you cannot see.
Two sensors, 28 days, your ordinary life.
By the end of it you will have:
- Your morning number, and whether it rises before you wake. Many people see their glucose climb in the hour before getting up, the dawn effect, and learn that a high fasting reading is not the same as a bad night.
- Your meal library. Every meal you log in VT gets its own response curve: how high, how fast, how long. After a month you know your three or four worst and your ten reliable ones, and the surprises are the point. The founder’s was oats.
- What training does. A hard session can raise glucose for an hour; a walk after dinner can flatten the curve by a third. You will see both, on your own numbers.
- Your nights. A flat line between midnight and six is what good looks like; a late meal, alcohol or a short night each leave a shape you will learn to recognize.
- Your baseline. Daily average, time in range, how often you spike and how far, and an estimated HbA1c, all against which the next month, and the next year, are measured. The Vitality Score’s blood-sugar area starts from here.
The sensor’s app shows the line. VT shows what the line is about.
The sensor’s own app does one thing well: it shows your glucose line and sounds the alarms people with diabetes rely on. Keep it; it stays installed, and VT reads your readings through it. What VT adds is everything the line is about.
| The sensor’s app | With Vitality Tracker | |
|---|---|---|
| What you see | The glucose line, and daily averages | The same line, with every meal, fast, workout, bedtime and night drawn on it |
| Meals | Not on the chart | Each logged meal gets its own response curve; after a month you have your personal meal library, with NOVA class, glycemic index and load on every ingredient |
| Sleep | Not on the chart | Your night’s glucose beside your sleep stages, overnight heart rate and HRV, so a high morning has a visible cause |
| Training | Not on the chart | Sessions marked on the line, with the after-dinner walk and the hard interval both visible |
| The numbers | Average, time in range | Average, time in range, estimated HbA1c, how much of each day the sensor covered, the exposure above 5.6 and 7.8 mmol/L, and the two-hour response to each meal |
| Bad data | Shown as readings | A failing sensor’s impossible readings are caught and taken out of your averages; the first-day warm-up and the night you lay on it are marked |
| The sensor itself | A countdown | Where it is worn (left arm, right arm, abdomen), when it expires, a reminder 12 hours before, and the difference between sites, which for some people is a whole mmol/L |
| Over time | This sensor | Every sensor you have ever worn, as one history, with your baseline month as the reference |
| Explanation | None | Eir reads the glucose beside everything else and tells you what moved and what in your logs explains it, with the evidence |
| Alarms | Yes, and they stay the sensor’s | Notifications for thresholds you set, one per episode; VT does not replace the sensor’s alarms |
| Your data | The maker’s | Yours: exported in full whenever you like |
From the store to your Baseline Month report.
Sibionics GS3
| Sibionics GS3 | |
|---|---|
| Wear time | 14 days per sensor |
| Warm-up | 1 hour |
| Readings | Every 5 minutes, by Bluetooth, to a phone within about 10 meters; the sensor stores 14 days if the phone is away |
| Calibration | None required |
| Accuracy | MARD 8.83 percent in adults, the manufacturer’s figure; readings lag blood by several minutes, which is why a finger-prick and a sensor rarely agree to the decimal |
| Water | IP38: showers and swimming, no deeper than 1 meter and no longer than 1 hour at a time |
| Size | 24.8 × 17.8 × 2.9 mm, about a 20-cent coin |
| Wear site | Back of the upper arm, per the quick-start guide; VT records which arm |
| Phone | iPhone or Android with Bluetooth; the Sibionics GS3 app plus the VT app |
| Removal | Peel off; the filament comes with it. Dispose of the sensor as household waste unless your council says otherwise |
| In the box | One sensor, one applicator, the product insert |
About Sibionics
Sibionics was founded in Shenzhen in 2015 by a group of thirty scientists, with the stated aim of giving every user accurate and convenient health management. Continuous glucose monitoring has been its main line of work since 2016: its first sensor, the GS1, launched in China in 2021 as the country’s first calibration-free all-in-one CGM and later received the CE mark; the GS3, the sensor we sell, was introduced at the ATTD diabetes technology conference in Amsterdam in March 2025.
The company is headquartered in Shenzhen with a second base in Irvine, California, employs more than five hundred people with roughly a quarter in research and development, and also works on AI retinal screening, capsule endoscopy and an implantable artificial retina. The GS3 carries a CE mark for the European market; it is not FDA-cleared.
Sibionics’ own About page →Who should talk to a doctor first
The Sibionics GS3 is a medical device. Its manufacturer’s intended use is “for the continuous monitoring of interstitial fluid glucose levels in patients 3 years and older with type 1 or type 2 diabetes”. Many people without diabetes choose to wear one to see their own glucose responses, and that is what this page is about. Three things follow.
- If you have diabetes or take any medicine that lowers glucose, your glucose management stays between you and your clinician, and the sensor’s own alarms, not Vitality Tracker, are what you rely on. Talk to your clinician before changing anything on the strength of what you see.
- If you are pregnant, under 18, have a skin condition where the sensor would sit, or have had reactions to medical adhesives, talk to your doctor before buying.
- Vitality Tracker is not a medical device. It describes and tracks your measures against your own history, for general wellness and for discussion with a health professional. It does not diagnose, predict or monitor any disease, and a reading that worries you is a question for your doctor, with your VT report in hand.
Remove the sensor before an MRI, CT or X-ray, and do a finger-prick test if a reading does not match how you feel.
The Baseline Month, and the months after.
Delivery within New Zealand. Libre 2+ and Ottai sensors you already own connect to VT as well; the GS3 is the one we distribute and support.
Get the Sibionics GS3 from the VT store →| Price | |
|---|---|
| Baseline Month pack, two sensors | Coming soon |
| Single sensor | Coming soon |
| Members on a paid plan | Coming soon |
Questions, in your words.
No. The GS3 is sold without one in New Zealand. If you have diabetes, read the box above first.
A brief press or pinch for most people, nothing for some. Wearing it, you forget it.
Yes. Showers and swimming are fine within the IP38 limits (1 meter, 1 hour); it stays on through sweat and most sport. Use a barrier film if your skin is sensitive.
The sensor measures the fluid under the skin, which trails blood by several minutes; a difference of a few tenths is normal. A reading that does not match how you feel deserves a finger-prick check.
They can, and for some people by a whole mmol/L. VT records which arm each sensor is on, so you can see it and choose.
For the month, yes, as far as you can: the meal library is the point. After that, log the meals you want to learn from.
Your live dashboard works from the first reading. The patterns, your meal library and your baseline take the month.
No. The GS3 app runs the sensor and its alarms; VT reads your readings through your Sibionics account and adds the context. Both stay installed.
It is yours, stored in Australia, exportable in full as CSV, never sold and never shown advertising.
- Hall H, Perelman D, Breschi A, et al. Glucotypes reveal new patterns of glucose dysregulation. PLoS Biology 2018;16(7):e2005143. doi:10.1371/journal.pbio.2005143
- Zeevi D, Korem T, Zmora N, et al. Personalized nutrition by prediction of glycemic responses. Cell 2015;163(5):1079–1094. doi:10.1016/j.cell.2015.11.001
- Berry SE, Valdes AM, Drew DA, et al. Human postprandial responses to food and potential for precision nutrition. Nature Medicine 2020;26(6):964–973. doi:10.1038/s41591-020-0934-0
- Wyatt P, Berry SE, Finlayson G, et al. Postprandial glycaemic dips predict appetite and energy intake in healthy individuals. Nature Metabolism 2021;3(4):523–529. doi:10.1038/s42255-021-00383-x
- Spiegel K, Leproult R, Van Cauter E. Impact of sleep debt on metabolic and endocrine function. The Lancet 1999;354(9188):1435–1439. doi:10.1016/S0140-6736(99)01376-8
- Gu C, Brereton N, Schweitzer A, et al. Metabolic effects of late dinner in healthy volunteers: a randomized crossover clinical trial. Journal of Clinical Endocrinology and Metabolism 2020;105(8):2789–2802. doi:10.1210/clinem/dgaa354
- Khaw KT, Wareham N, Bingham S, et al. Association of hemoglobin A1c with cardiovascular disease and mortality in adults: the European Prospective Investigation into Cancer in Norfolk. Annals of Internal Medicine 2004;141(6):413–420. doi:10.7326/0003-4819-141-6-200409210-00006
- Sibionics GS3 product page (specifications and intended use), en.sibionics.com/GS3, read 19 October 2026. en.sibionics.com/GS3