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Are CGMs Worth It If You Don’t Have Diabetes? Stelo vs. Lingo and What the Evidence Says
Two over-the-counter glucose sensors are sold to adults without diabetes. Here is what they cost, what they can show you, and why the research on benefit is still thin.
Reviewed against NIH & PubMed research. By HealthSpan40 Editorial Team · Last updated October 10, 2026.
ⓘ Pending expert review: This guide was written and cited from published research as a reference starting point. It has not yet been reviewed by a credentialed medical professional. Treat it as background reading, not clinical guidance.
Continuous glucose monitors, or CGMs, used to need a prescription. Since 2024 you can buy one without seeing a doctor, and the marketing is aimed squarely at healthy adults in their 40s and beyond: see how that bagel hits you, learn which walks help, catch trouble early. It is an appealing idea, because blood sugar regulation tends to drift as we age.
The catch is that nobody has shown that wearing a sensor leads to better health in people without diabetes. A CGM can show you a reading throughout the day, but the science of what to do with it, and what counts as a worrying spike, is still catching up. This guide compares the two sensors made for this market, summarizes the research, and says plainly who should skip them.
We compared manufacturer pages, regulator statements, independent reviews and published research. We did not wear or test these devices ourselves.
Our top picks at a glance
Dexcom Stelo
15-day sensors, monthly plan, Apple Watch pairing.
Abbott Libre Rio
Cleared for type 2 diabetes without insulin, not for general wellness.
Quick comparison
| Product | Best for | Sensor life | Who it is cleared for | Approx. price* | |
|---|---|---|---|---|---|
| Dexcom Stelo | Ongoing tracking | Up to 15 days | Adults 18+, not on insulin | about $89 per month | View |
| Abbott Lingo | Short trial | Up to 14 days | Adults 18+, not on insulin | about $54 per 2 weeks | View |
| Abbott Libre Rio | Type 2, no insulin | Not verified | Adults 18+ with type 2, not on insulin | Not verified | View |
*Prices at time of writing; check the retailer for current pricing.
How we chose
Only two over-the-counter CGMs are marketed to people without diabetes in the US: Stelo and Lingo. We covered both and added Abbott’s Libre Rio because shoppers often confuse it with Lingo. We judged each on:
- Regulatory status: FDA-cleared for over-the-counter use, and for whom.
- Cost and commitment: price, subscription terms and how many sensors you need for a useful look.
- Sensor life and reliability: wear time and what happens if a sensor fails early.
- App and data features: logging, platform support, and the quality of the interpretation.
- Evidence and cautions: what independent research supports, and who should not use them.
The over-the-counter CGMs for adults over 40
Dexcom Stelo
Stelo was the first CGM the FDA cleared for over-the-counter sale. It is a wearable sensor that pairs with a phone app, which per FDA-announcement coverage shows readings every 15 minutes. According to Dexcom, the app tracks time in range, flags spikes, lets you log meals and activity, and offers tips and AI coaching that the company says are not medical advice. The Stelo page also lists Apple Watch pairing and an optional, separately offered nutrition coaching service from Nutrisense.
Dexcom says the device is not for people with problematic low blood sugar or people on insulin, and not for making medication changes without a clinician. The company’s own footnote says about 78% of sensors lasted the full 15 days, so expect to replace some early. At the listed rates, Stelo works out to roughly $89 per month of coverage.
Pros
- Longer 15-day sensor
- Monthly plan priced below two Lingo plans
- HSA/FSA eligible per the Stelo page
Cons
- Subscription commitment
- Some sensors end before 15 days
- App insights are general, not clinical
Best for: adults who want a few months of data, especially with prediabetes risk factors and a clinician to discuss it with. Skip if: you take insulin, have hypoglycemia problems, or have a history of disordered eating.
Abbott Lingo
Lingo uses a sensor in the same family as Abbott’s prescription Libre line, with a consumer app that shows a “Lingo Count” for tracking glucose spikes, logging, weekly patterns, habit challenges and syncing with Apple Health or Health Connect. The Lingo page says the plan does not auto-renew, includes free shipping, replaces a sensor that fails before 14 days, and carries a 30-day money-back guarantee for first-time purchases.
That structure makes it the easier way to try a CGM once. The same page says Lingo is not meant to diagnose disease and cautions people with an eating disorder or a history of one to talk with a professional first. A 2024 hands-on review from diaTribe described a rocky setup and difficult-to-read app for some staff testers, and noted that the reviewers could not tell whether their readings reflected the device’s accuracy or their own changed habits. Those are anecdotes, not accuracy testing.
Pros
- No commitment
- Works with iOS and Android
- Replacement for early failures
Cons
- 14-day sensor means two plans cost more per month
- Spike-focused scoring can encourage food fear
Best for: curious adults who want one or two weeks of data. Skip if: you tend to obsess over numbers, take insulin, or are pregnant (confirm with your clinician).
Abbott Libre Rio
Libre Rio is included because it is sold next to Lingo, but it is not a general wellness product. Abbott’s announcement describes it for adults with type 2 diabetes who do not use insulin. If you already have a diabetes diagnosis, talk with your clinician about which CGM and coverage options fit you, because a prescription device may be covered by insurance. We could not confirm current retail pricing, so check Abbott or a retailer.
Pros
- Cleared for type 2 without insulin
- No prescription needed
Cons
- Not intended for people without diabetes
- Pricing and availability not confirmed here
Best for: adults with type 2 diabetes not on insulin. Skip if: you do not have diabetes; choose Stelo or Lingo instead.
Buying guide: what matters after 40
What you will actually see
In a multicenter study summarized in a 2022 review in Sensors, healthy normal-weight adults had a mean 24-hour glucose of about 99 mg/dL and spent roughly 96% of the time between 70 and 140 mg/dL. In other words, normal people still have short post-meal rises and brief dips. A spike on your graph is often normal physiology, not a warning.
Accuracy limits
A review by UCL and Birmingham Children’s Hospital researchers noted that even the most accurate CGMs are typically within about 20% of true glucose. Readings also lag blood glucose, which matters when levels move fast, such as during exercise. Sensors can be off, especially in the first day and when you lie on the arm. If a number worries you, a fingerstick or lab test is the reference.
Cost and commitment
At the listed rates, a month of Stelo costs about $89, and two Lingo plans cost about $108. Insurance generally does not cover wellness use. Many people get most of the insight from one or two sensors, so a long subscription may not be needed.
Privacy
Glucose, meal and activity logs are sensitive health data. Wellness apps are often not covered by HIPAA the way a clinic is, so read each company’s privacy policy to see what is shared, sold or used for marketing. We did not audit the Stelo or Lingo policies, so check them before you create an account.
Who should skip
- Anyone taking insulin or with problematic low blood sugar, per both companies.
- People with an eating disorder or history of one, or a tendency toward food anxiety.
- Anyone who plans to adjust medications from the data.
- People who are pregnant, unless their clinician recommends it.
- Anyone with symptoms that need a medical workup.
What the research says
For people without diabetes, the evidence is limited. The UCL-led narrative review in Diabetic Medicine examined 25 studies and found a lack of consistent, high-quality evidence supporting CGM use in people not living with diabetes, little data on accuracy for this group, and little on whether the information is useful. The authors raised concern about anxiety about normal food and glucose, possibly contributing to disordered eating, but acknowledged that personalized programs can get people thinking more about what and how much they eat.
The 2022 Sensors review (Holzer and colleagues) is more optimistic. It describes possible uses, such as spotting abnormal glucose regulation earlier than fasting glucose or HbA1c, learning how foods affect you, and motivating activity, and calls the potential high. It also states that interpreting data in healthy people is hard and that more studies are needed.
The FDA clearance itself is narrow. Coverage of the March 2024 decision says the device is for adults with or without diabetes who do not use insulin, is not for people with low blood sugar, and should not drive medical decisions without checking with a provider. Neither company markets it to diagnose diabetes.
Bottom line: a CGM can be an educational tool, and some people change habits after seeing a post-meal graph. It has not been shown to prevent diabetes or heart disease in people without it. Established tools, such as an HbA1c or fasting glucose test from your doctor, a healthy diet, strength training and regular walking, have much stronger evidence.
When to see a doctor
- Symptoms such as excessive thirst, frequent urination, unexplained weight loss, blurred vision or fatigue. Ask for lab testing instead of relying on a wearable.
- A family history of diabetes, prior gestational diabetes, or other risk factors, so you can be screened properly.
- Repeated high or low readings that worry you. Confirm with lab tests.
- Any plan to change medication based on glucose data.
Frequently asked questions
Do I need a prescription for Stelo or Lingo?
No. Both are cleared by the FDA for over-the-counter sale to adults 18 and older who do not use insulin.
Can a CGM tell me if I have prediabetes?
No. Neither product is intended to diagnose diabetes. Diagnosis relies on lab tests such as fasting glucose or HbA1c ordered by a clinician.
Is Stelo or Lingo better?
It depends on your goals. Stelo has a longer 15-day sensor, a monthly price and Apple Watch pairing. Lingo has a no-commitment 2-week plan and supports both iOS and Android. Independent accuracy comparisons are limited.
How long should I wear one?
There is no evidence-based rule. Many people learn the main patterns in one to two sensors. Wearing one indefinitely adds cost and may increase food anxiety without clear benefit.
Will insurance or an HSA pay?
Insurance generally does not cover wellness use. The Stelo page says it is HSA/FSA eligible; confirm with your plan administrator.
Is a glucose spike dangerous?
Not necessarily. Healthy adults have post-meal rises, and sensors can read off. Look at the overall pattern, and ask a clinician before restricting foods based on a graph.
Related guides
Sources
- Stelo by Dexcom — product page
- Lingo — Abbott product page
- Abbott’s Lingo rolls out in the US — MedTech Dive
- Dexcom begins selling Stelo — MedTech Dive
- Abbott enters the US consumer biowearables market with Lingo and Libre Rio — Abbott
- FDA approves first OTC continuous glucose monitor — WebMD
- Use of glucose monitors in people not living with diabetes needs more regulation — UCL
- Continuous Glucose Monitoring in Healthy Adults (Sensors, 2022) — PubMed Central
- diaTribe reviews: Lingo by Abbott — diaTribe
ⓘ Medical disclaimer: This guide is for educational purposes only and is not medical advice. CGMs are not intended to diagnose or manage diabetes in people who use them for wellness, and should not be used to change medication. Talk to your doctor before starting supplements, devices or treatments.