How Effective Are Over-the-Counter CGMs? A Look at Dexcom Stelo & Abbott Lingo
- Julene Montgomery
- Mar 31
- 5 min read
If you’ve ever wondered what’s happening with your blood sugar throughout the day—after meals, during workouts, or even while you sleep—you’re not alone. Continuous Glucose Monitors (CGMs) have traditionally been reserved for people with diabetes, but recently, over-the-counter (OTC) CGMs have started making their way into the wellness space. These devices promise real-time glucose tracking without the need for a prescription, giving more people insight into how their lifestyle choices impact their blood sugar. But how effective are these OTC CGMs, and are they worth the investment? Let’s break it down.
What Is a Continuous Glucose Monitor (CGM)?
A CGM is a small wearable device that tracks glucose levels in real time. Unlike traditional fingerstick tests, which provide a single snapshot, a CGM gives a continuous stream of data by measuring glucose in the interstitial fluid (the fluid between your cells). This data can help users identify patterns, understand how food, exercise, and stress affect their blood sugar, and make more informed lifestyle choices.
Until recently, CGMs were primarily used by people with diabetes to manage insulin levels. But with increasing interest in metabolic health, companies have started developing CGMs for the general population, allowing people without diabetes to track their blood sugar for wellness and performance optimization.
The Two Most Popular OTC CGMs: Dexcom Stelo and Abbott Lingo
As the market for non-prescription CGMs grows, two standout options have emerged: Dexcom Stelo and Abbott Lingo. These devices are designed for people who don’t have diabetes but want to monitor their blood sugar for health optimization. Here’s a quick rundown of each:
Dexcom Stelo Dexcom is a leader in the CGM space, and their new OTC option, Stelo, is tailored for people interested in improving metabolic health. Stelo works similarly to Dexcom’s prescription CGMs but is designed for those without diabetes. It provides continuous glucose readings, tracks trends, and offers insights through an easy-to-use app. The goal is to help users understand how different foods and activities impact their blood sugar levels, potentially leading to better long-term health outcomes.
Abbott Lingo Abbott, another big player in the glucose monitoring world, has introduced Lingo as a wellness-focused CGM. The system is marketed toward people looking to optimize athletic performance, maintain steady energy levels, and understand their body’s response to food and exercise. The Lingo app translates glucose data into actionable recommendations, helping users fine-tune their diet and lifestyle choices.
Both of these devices aim to give users a deeper understanding of how their bodies process glucose, with the idea that more awareness leads to better health decisions.
Are OTC CGMs Effective?
Effectiveness depends on what you’re hoping to achieve. If your goal is better metabolic health, a CGM can be a game-changer. Here’s why:
Real-Time Feedback One of the biggest advantages of a CGM is instant feedback. Instead of guessing how your body reacts to certain foods or activities, you can see the impact in real time. For example, you might discover that your so-called “healthy” smoothie sends your blood sugar soaring, while a protein-rich breakfast keeps it steady.
Behavior Change Seeing your blood sugar spike after a carb-heavy meal can be eye-opening. Many users report making healthier food choices simply because they can see the immediate effects of their diet. This kind of reinforcement can be more effective than general dietary advice.
Personalized Insights Everyone’s body responds differently to food. A CGM helps you identify your unique triggers—foods that cause your blood sugar to crash, meals that keep you full and energized, and exercise routines that stabilize glucose levels. This information allows for a more personalized approach to nutrition and fitness.
Energy and Performance Optimization For athletes and fitness enthusiasts, keeping blood sugar stable is key to sustained energy and performance. CGMs help users fine-tune their nutrition strategy to avoid energy crashes and optimize fuel intake for workouts.
Early Detection of Metabolic Issues Even if you’re not diabetic, tracking glucose trends over time can help you identify potential metabolic issues before they become a problem. High glucose spikes and crashes can be an early warning sign of insulin resistance, which, if left unchecked, can lead to prediabetes and other metabolic disorders.
Limitations of OTC CGMs
While OTC CGMs offer valuable insights, they’re not perfect. Here are a few things to keep in mind:
Accuracy Variations: CGMs measure glucose in interstitial fluid, not directly in the blood, so there can be a slight lag between readings and actual blood glucose levels. Factors like hydration and sensor placement can also affect accuracy.
No Medical Guidance: Unlike prescription CGMs, OTC versions don’t come with professional oversight. This means users need to interpret their own data and make adjustments accordingly, which can be challenging for those unfamiliar with glucose metabolism.
Cost: CGMs can be pricey. While OTC options may be more affordable than prescription models, they still require ongoing sensor replacements, making them a recurring expense.
Data Overload: Too much data can be overwhelming. Some users may find themselves obsessing over every glucose fluctuation, leading to unnecessary stress or restrictive eating behaviors.
Who Can Benefit from an OTC CGM?
If you’re wondering whether an OTC CGM is right for you, consider your goals. These devices may be particularly useful for:
People with prediabetes: Monitoring glucose trends can help individuals take proactive steps to improve insulin sensitivity and prevent diabetes.
Health-conscious individuals: Those looking to optimize their diet, energy levels, and overall metabolic health can benefit from personalized insights.
Athletes and fitness enthusiasts: Keeping blood sugar stable can help optimize performance and recovery.
Individuals experiencing energy crashes or brain fog: If you often feel sluggish or irritable between meals, a CGM can help identify blood sugar imbalances.
The Bottom Line
Over-the-counter CGMs like Dexcom Stelo and Abbott Lingo offer a powerful tool for those looking to optimize their health. While they may not be 100% necessary for everyone, they provide valuable insights that can help users make smarter dietary and lifestyle choices. If you’re curious about how your body responds to different foods, activities, and stressors, a CGM can be a worthwhile investment in your long-term health.
That said, it’s important to use these devices as a tool—not as something to stress over. Blood sugar levels fluctuate naturally, and occasional spikes aren’t always a cause for concern. The key is understanding trends over time and making sustainable adjustments that support overall well-being.
Whether you’re trying to stabilize your energy, improve metabolic health, or simply satisfy your curiosity about how your body works, an OTC CGM could be the nudge you need to take control of your health in a more informed way.
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